WO2000003508A1 - Procede de communication, emetteur, et recepteur - Google Patents
Procede de communication, emetteur, et recepteur Download PDFInfo
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- WO2000003508A1 WO2000003508A1 PCT/JP1999/003734 JP9903734W WO0003508A1 WO 2000003508 A1 WO2000003508 A1 WO 2000003508A1 JP 9903734 W JP9903734 W JP 9903734W WO 0003508 A1 WO0003508 A1 WO 0003508A1
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- 238000004891 communication Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims description 97
- 230000005540 biological transmission Effects 0.000 claims abstract description 275
- 238000012545 processing Methods 0.000 claims abstract description 164
- 239000000969 carrier Substances 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 claims description 12
- 239000000284 extract Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 42
- 238000013507 mapping Methods 0.000 description 19
- 230000003111 delayed effect Effects 0.000 description 14
- 238000003780 insertion Methods 0.000 description 13
- 230000037431 insertion Effects 0.000 description 13
- 230000001413 cellular effect Effects 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 230000010363 phase shift Effects 0.000 description 6
- 108010003272 Hyaluronate lyase Proteins 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 108010000178 IGF-I-IGFBP-3 complex Proteins 0.000 description 1
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the present invention relates to a communication method in digital wireless communication suitable for application to a wireless communication system such as a cellular wireless telephone system, and a transmitter and a receiver to which the communication method is applied.
- a wireless communication system such as a cellular wireless telephone system
- a transmitter and a receiver to which the communication method is applied.
- a communication system for efficiently communicating by sharing a wide frequency band among a plurality of users such as a wireless telephone system
- a DS-CDMA Direct Sequence-Code Division Multiple Access
- a transmission signal sequence is spread (multiplied) by a code to generate a wideband signal and transmit it.
- the receiving side multiplies the received signal by the same spreading code as the transmitting side to obtain an effect called despreading, and extracts only a desired signal component from the received signal.
- FIG. 1 shows a transmission configuration in a conventional cellular radio communication system to which the DS-CDMA scheme is applied.
- the information bit stream obtained at the input terminal 1 is subjected to encoding, interleaving, and other processing at the coding unit 2, and then is supplied to the multiplier 3 to be processed at the terminal 3.
- the spread bitstream is randomized by a long code obtained at a terminal 4 a in a multiplier 4 in the next stage, and then mapped to a transmission symbol in a symbol mapping section 5.
- mapping methods There are various mapping methods depending on the communication method.
- the transmission signal mapped by the symbol mapping unit 5 is multiplexed with the transmission signal of another system by the adder 6 if necessary, supplied to the transmission processing unit 7, and subjected to high-frequency processing such as modulation. Later, wireless transmission The frequency is converted to a frequency band for performing the frequency conversion, and is transmitted wirelessly from the antenna 8.
- the coding section 2 encodes the information bit stream at a coding rate of 1/2, and encodes the encoded bit.
- the spreader becomes 16 kbps and is spread by the multiplier 3 with a spreading factor of 64, it becomes a bit stream of 1024 kcps (cps is Chip Per Second).
- the bit rate of the information bit stream is different, the bit rate of the transmission signal can be made constant by changing the spreading factor in multiplier 3.
- bit stream of the transmission signal supplied to the adder 6 is constant, the information supplied to the coding unit 2 of each transmission system Various kinds of bit streams can be mixed.
- a signal in a predetermined frequency band received by the antenna 11 is frequency-converted into an intermediate frequency signal or the like by the reception processing unit 12, and the frequency-converted received signal is demodulated to obtain a baseband symbol sequence. . From this symbol sequence, a bit extraction section 13 extracts a reception bitstream.
- the extracted received bit stream is supplied to a multiplier 14 where it is multiplied by the long code obtained at the terminal 14a, descrambled, and multiplied by the multiplied output of the multiplier 14
- the signal is supplied to the decoder 15 and multiplied by the despreading code obtained at the terminal 15a to perform despreading processing, thereby obtaining an encoded bit stream.
- the encoded bit stream is decoded by the decoding unit 16 to obtain an information bit stream at the terminal 17.
- the signal in the case where the information bit stream of 8 kbps described above is transmitted as a bit stream of 104 kcps is shown in FIG. ,
- the signal is despread by the multiplier 15 at the despreading factor 64 to obtain an information bit stream of 8 kbps. Also, by changing the despreading rate of the despreading code obtained at the terminal 15a, it is possible to cope with the information bit stream of other bit rates.
- FIG. 3 is a diagram showing one frame structure in the case of an 8TDMA structure in which one frame is composed of one slot and eight time slots from slot 8 to slot 8.
- slot allocation when the transmission rate per slot is 8 kbps, for example, slots 1 and 2 are assigned to users A and B with a transmission rate of 8 kbps, respectively.
- the communication at a transmission rate of 8 kbps is performed in slot 1 or 2.
- user C with a transmission rate of 16 kbps is assigned two slots, slot 3 and slot 4, and communicates at 16 kbps.
- four slots from slot 5 to slot 8 are assigned to the user D whose transmission rate is 32 kbps, and communication is performed at 32 kbps.
- the base station etc. variably sets the number of slots in one frame to each user according to the transmission rate at the time of transmission request from each user.
- OFDM Orthogonal Frequency Division Mult iplex
- Orthogonal frequency division multiplexing When wireless transmission is performed by a multi-carrier system called a system, a transmission configuration such as that shown in FIG. This configuration is based on DAB (Digital Audio Broa In the configuration applied to digital audio broadcasting called dcasting), the information bit stream obtained at terminal 21 is subjected to processing such as encoding at coding section 22 before being processed. Symbol mapping section 23 maps to transmission symbol. Then, the transmission symbol is supplied to the mixing circuit 24 and multiplexed with other transmission data.
- the symbols are rearranged by the frequency interleaving in the frequency conversion unit 25, and the symbols of each channel are arranged in a line.
- the rearranged symbol stream is converted into a multicarrier signal arranged on the frequency axis by an inverse Fourier transform process in an inverse Fourier transform circuit (IFFT circuit) 26, and the IFFT circuit 26
- IFFT circuit inverse Fourier transform circuit
- a signal of a desired frequency band received by the antenna 31 is used as a baseband signal by the reception processing unit 32.
- the baseband signal component of the multicarrier signal is a signal in which information is arranged on the frequency axis, it is supplied to a fast Fourier transform circuit (FFT circuit) 32 to perform Fourier transform processing. Extract the subcarriers arranged on the frequency axis. At this time, the symbols output by the Fourier transform process become a subcarrier group of the entire received signal band.
- the converted signal of this subcarrier group is supplied to the symbol selection section 34. Then, a symbol is extracted from a position of a symbol of a desired channel arranged by frequency interleaving performed on the transmission side. In addition, the extracted symbol stream is stored in the bit extraction unit.
- the Fourier transform circuit provided in the receiver converts symbols for all channels multiplexed and transmitted, and selects a channel after the conversion.
- variable frequency data transmission is possible by fixing the used frequency band and changing the spreading factor.
- fixing the used frequency band it is possible to configure a terminal device that provides a variable bit rate service with only a single high-frequency circuit.
- the DS-CDMA system has a very complicated communication control system.
- the DS-CDMA system prevents hand-off processing for switching base stations and interference with other communications in the system. It is necessary to perform transmission power control and so on with very high accuracy.
- the transmission power control is not performed correctly. There is a danger that the entire system will not function if there is even one, and it cannot be said to be a system suitable for performing complex processing such as variable transmission rate.
- the transmission rate variable processing is applied in the DS-CDMA system.
- the same processing as the terminal device that communicates at the highest transmission rate that can be transmitted by the system Is required, which greatly increases the amount of arithmetic processing in the terminal device.
- the maximum transmission rate per channel is basically determined by [Bit rate when one slot is allocated. ] X [the number of TDMAs], and the upper and lower limits of the transmission rate are determined by the number of TDMAs. Therefore, if the range in which the transmission rate changes is extremely large, for example, from about several kbps to about 100 kbps, it is possible to correspond to the transmission rate desired by the user only by slot allocation. It is virtually impossible. It is not impossible if the number of time slots in one frame is extremely large, but it is not realistic from the viewpoint of communication control.
- the communication means such as a receiver uses the minimum necessary amount of processing required by itself to perform information communication processing.
- the purpose is to make it possible.
- a plurality of channels are set in a predetermined band, and communication on each set channel is transmitted to a plurality of subcarriers.
- the arrangement of the transmission symbols on each channel on the frequency axis is determined every 2 N times with respect to the reference frequency interval (N is a positive arbitrary number. Number of communication methods).
- N is a positive arbitrary number. Number of communication methods.
- a second invention is the communication method according to the first invention, wherein the communication is wireless communication.
- broadband wireless communication is performed at wide subcarrier intervals,
- the value of N is variably set in accordance with a data bit rate to be transmitted. By doing so, it is easy to mix and transmit data with different bit rates.
- a fourth invention is the communication method according to the first invention, wherein the communication method is applied to communication between a base station and a terminal device, and one channel of a downlink channel transmitted from the base station is used as a pilot channel. The remaining channels are used as traffic channels.
- the base station transmits the known signal on the pilot channel, and the terminal device transmits the symbol received on the pilot channel.
- the equalization processing of the transmission path of the symbol received on the traffic channel is performed, and the synchronous detection of the equalized symbol is performed. It is. By doing so, it is possible to easily and satisfactorily perform the transmission signal equalization processing.
- the transmitted signal is frequency-hobbed in units of channels or in units of frequencies.
- a plurality of channels are set in a predetermined band, and communication on each of the set channels is performed by a multi-carrier signal in which transmission symbols are distributed to a plurality of subcarriers.
- a subcarrier assigned to each channel a predetermined number of subcarriers are used, and differential modulation is performed between adjacent ones of the subcarriers assigned to each channel.
- the communication method is to perform differential demodulation between adjacent devices.
- the channel arrangement becomes a multi-carrier signal using a predetermined number of sub-carriers and a differential between adjacent sub-carriers for each channel.
- an eighth invention is to generate a multicarrier signal in which transmission symbols are dispersed among a plurality of subcarriers, and to arrange transmission symbols on the frequency axis in one channel of the multicarrier signal.
- the reference frequency interval is set to every Nth power of 2 (N is an arbitrary positive number), and the generated multi-carrier signal is a predetermined channel among a plurality of channels set within a predetermined band. It is a transmitter that transmits as a channel. By doing so, the transmission symbols of each channel are arranged at a predetermined frequency interval, a multi-carrier signal in which each channel is multiplexed is transmitted, and the transmission symbols of each channel are fixed.
- the transmission signal can be formed by simple processing and can be easily multiplexed by simple processing.
- the value of N is variably set in accordance with a bit rate of data to be transmitted. With this configuration, data having different bit rates can be mixed and transmitted easily.
- the transmission symbols of a plurality of channels are individually generated, and then the symbols of each channel are arranged for each symbol to generate a multiplex symbol sequence.
- the multi-carrier signal generation processing is performed collectively on the generated multiplex symbol sequence, and the transmission processing is performed collectively on a plurality of channels.
- a transmission symbol is generated, the generated transmission symbol is extracted as a signal on the time axis, and then the signal is assigned to a channel allocated to the own station.
- the processing for convolving the corresponding frequency offset is performed. By doing so, the process of transmitting at the target frequency can be satisfactorily performed with a simple configuration.
- a known signal is transmitted and processed by using one of a plurality of transmitted channels as a pilot channel, and the remaining channels are processed. Is transmitted as a traffic channel. By doing so, transmission control can be satisfactorily performed based on a known signal transmitted on the pilot channel.
- a thirteenth aspect of the present invention is the transmitter according to the eighth aspect, further comprising a frequency hobbing means for frequency-hobbing the generated multi-carrier signal in channel units or in predetermined frequency band units.
- a multicarrier signal in which transmission symbols are dispersed among a plurality of subcarriers is received, and transmission symbols received in one channel are raised to the Nth power of a reference frequency interval.
- This is a receiver that performs reception processing at every other frequency interval (N is any positive number).
- N is any positive number.
- the communication channel transmitted by the transmission side is transmitted. Only symbols are extracted, and the extracted symbols are supplied to a channel decoder to be decoded. By doing so, it is possible to efficiently perform reception processing of only necessary symbols.
- a sixteenth invention is directed to the receiver of the fourteenth invention, wherein The received signal is sampled at a sample rate determined by the bandwidth, and the sampled symbols are added or subtracted from each other to select a desired received channel, and the subsequent steps are performed.
- the number of symbols to be output is reduced to the minimum required sample rate determined by the maximum bit rate during reception, and received data with the minimum required number of symbols is received. It is intended to be processed. By doing so, it is possible to efficiently obtain received data of the required number of symbols of the sample rate.
- a seventeenth invention is a correction means for multiplying data of at least one reception channel by a sine wave offset correction signal when a plurality of reception channels are selected in the receiver of the sixteenth invention. Is provided. By doing so, it is possible to easily remove the offset included between the data of each received channel.
- An eighteenth aspect of the present invention is the receiver according to the sixteenth aspect, wherein the reception processing means for receiving and processing the received data has a processing capability determined by the maximum bit rate, and is higher than the maximum bit rate.
- the reception processing means for receiving and processing the received data has a processing capability determined by the maximum bit rate, and is higher than the maximum bit rate.
- a ninth aspect of the present invention is the receiver according to the fourteenth aspect, further comprising: a pilot channel reception processing means; and a traffic channel reception processing means, wherein the pilot channel reception processing means is provided.
- the traffic channel reception processing means uses the symbol of the known signal received in step (1), the traffic channel reception processing means performs a process of equalizing the transmission path of the received symbol of the traffic channel. By doing so, the transmission of received symbols on the traffic channel Road equalization processing can be performed favorably based on pilot channel received signals, and good reception processing can be performed.
- a 20th invention is the receiver according to the 14th invention, further comprising frequency hopping means for frequency-hopping the received signal in a channel unit or a predetermined frequency band unit. By doing so, the reception processing of the frequency-hopped transmission signal can be properly performed.
- FIG. 1 is a block diagram showing an example of a conventional DS-CDM ⁇ transmission process.
- Fig. 2 is a block diagram showing an example of the conventional DC-CDMA reception process.
- FIG. 3 is an explanatory diagram showing an example of multiplexing in the conventional TDMA system.
- FIG. 4 is a block diagram illustrating an example of a conventional 0FDM transmission process.
- Fig. 5 is a block diagram showing an example of reception processing in the conventional OFDM system.
- FIG. 6 is a block diagram showing a transmission configuration example according to the first embodiment of the present invention.
- FIG. 7 is an explanatory diagram showing an example of a null symbol insertion and extraction state according to the first embodiment of the present invention.
- FIG. 8 is a block diagram showing a receiving configuration example according to the first embodiment of the present invention.
- FIG. 9 is an explanatory diagram showing a symbol arrangement example according to the first embodiment of the present invention.
- FIG. 10 illustrates processing according to the first embodiment of the present invention in the TDMA system. It is explanatory drawing which shows the example applied to.
- FIG. 11 is a block diagram showing a transmission configuration example according to the second embodiment of the present invention.
- FIG. 12 is a configuration diagram showing an example of the mixing circuit according to the second embodiment of the present invention.
- FIG. 13 is an explanatory diagram showing an example of a mixed state according to the second embodiment of the present invention.
- FIG. 14 is a block diagram illustrating a transmission configuration example according to the third embodiment of the present invention.
- FIG. 15 is an explanatory diagram showing an example of a mixed state according to the third embodiment of the present invention.
- FIG. 16 is a block diagram illustrating a transmission configuration example according to the fourth embodiment of the present invention.
- FIG. 17 is a block diagram illustrating a configuration example of an internal channel selection unit according to the fourth embodiment of the present invention.
- FIG. 18 is an explanatory diagram showing an example of subcarrier arrangement according to the fourth embodiment of the present invention.
- FIG. 19 is a block diagram illustrating a receiving configuration example according to the fourth embodiment of the present invention.
- FIG. 20 is a configuration diagram showing an example of the separation circuit according to the fourth embodiment of the present invention.
- FIG. 21 is an explanatory diagram showing an example of a separated state according to the fourth embodiment of the present invention.
- FIG. 22 is a block diagram illustrating a receiving configuration example according to the fifth embodiment of the present invention.
- FIG. 23 is a configuration diagram illustrating an example of a channel selection unit according to the fifth embodiment of the present invention.
- FIG. 24 shows a channel selector according to the fifth embodiment of the present invention.
- FIG. 9 is an explanatory diagram showing an example of the processing of FIG.
- FIG. 25 is a configuration diagram showing another example of the channel selection unit.
- FIG. 26 is a configuration diagram showing still another example of the channel selection unit.
- FIG. 27 is a block diagram illustrating a transmission configuration example according to the sixth embodiment of the present invention.
- FIG. 28 is a block diagram showing a receiving configuration example according to the sixth embodiment of the present invention.
- FIG. 29 is an explanatory diagram showing an example of arrangement of transmission symbols according to the sixth embodiment of the present invention.
- FIG. 30 is a configuration diagram illustrating an example of a channel selection unit according to the sixth embodiment of the present invention.
- FIG. 31 is an explanatory diagram showing an example of subcarrier arrangement by other processing in each embodiment of the present invention.
- FIG. 32 is an explanatory diagram illustrating a frequency hobbing process applied to each embodiment of the present invention.
- the present embodiment is an example applied to a cellular radio telephone system.
- FIG. 6 shows a transmission configuration on the base station side or the terminal device side in the system of this example.
- the terminal 10 has a configuration that can transmit data of four types of transmission rates of 32 kbps, 64 kbps, 96 kbps, and 128 kbps.
- the information bit stream of any of the transmission rates described above obtained in step 1 is encoded and encoded by the coding unit 102.
- the coding process such as talive is performed, and coding is performed at a predetermined coding rate such as the coding rate 1Z2.
- Each bit coded by the coding section 102 is supplied to a symbol mapping section 103 to be mapped to a transmission symbol.
- processes such as QPSK process, 8PSK process, and 16 QAM process can be applied.
- differential modulation may be performed on the frequency axis or the time axis.
- the transmission symbol generated by the symbol mapping unit 103 is supplied to a null symbol input unit 104.
- the null symbol insertion unit 104 the amplitude (energy) is adjusted according to the transmission rate at that time.
- Symbols of 0 are regularly inserted, and the symbol rate is set to the maximum transmission rate (in this case, a rate corresponding to 128 kbps) regardless of the transmission rate of the original information bit stream. Is performed.
- Fig. 7 shows an example of the human status of this null symbol.
- the symbol position indicated by the symbol ⁇ is the symbol position of the original transmission data
- the symbol position indicated by the X symbol is the null symbol 0 is the position of the 0 symbol inserted in 4.
- the symbol position indicated by the X symbol is the null symbol 0 is the position of the 0 symbol inserted in 4.
- the information bit stream transmission rate of 32 kbps as shown in A of FIG. 7
- three null symbols are inserted between each of the original symbols to obtain 128 kbps. Is converted to transmission data with the number of symbols corresponding to (ie, 4 times).
- the information bitstream transmission rate of 64 kbps one null symbol is inserted between the original symbols as shown in B of FIG. It is converted into a transmission data with the number of symbols equivalent to 128 kbps (that is, twice).
- the transmission rate of the information bit stream is 96 kbps, as shown in C in Fig. 7, every three original symbols are used.
- one null symbol is inserted and converted into transmission data of the number of symbols corresponding to 128 kbps (that is, 4 Z 3 times).
- the transmission rate of the information bitstream is 128 kbps, As shown in the figure, transmission data of the same number of symbols is used without inserting null symbols.
- the insertion rate R of null symbols in the null symbol insertion unit 104 is defined by the following equation.
- M is the maximum transmission rate in this transmission band (here, 128 kbps)
- D is the transmission rate in the corresponding channel.
- the processing in the null symbol interpolator 104 is a processing of controlling the symbol to be 2N times (N is any positive number) by inserting a null symbol. is there. However, when processing is performed at the rate of 96 kbps, as shown in C in Fig. 7, that is, when the value of N is not an integer, a null symbol is inserted based on the above equation (1).
- the transmission symbol in which the null symbol is inserted in the null symbol insertion unit 104 performs scrambling (or other scrambling) by the random phase shift in the random phase shift unit 105.
- the scrambled transmission symbol is supplied to an inverse Fourier transform (IFFT) processing unit 106, and a symbol stream arranged on the time axis is calculated by an inverse fast Fourier transform operation.
- the signal is converted to a multicarrier signal with subcarriers arranged on the frequency axis.
- the signal converted by the inverse free-transform processing unit 106 is supplied to a guard time adding unit 107 to add a guard time, and the windowing processing unit 108 converts the signal into a signal of a predetermined unit. Multiply the windowing data for transmission.
- the transmission signal multiplied by the windowing data is supplied to a transmission processing unit 109, in which the high-frequency signal is convolved and frequency-converted into a predetermined transmission frequency band, and the frequency-converted transmission signal is transmitted to the antenna 110.
- FIG. 8 shows a configuration in which a terminal device or a base station receives a signal wirelessly transmitted in such a configuration.
- the reception processing unit 112 to which the antenna 111 is connected receives a signal in a predetermined transmission frequency band and converts it into a baseband signal.
- the converted baseband signal is supplied to a windowing processing unit 113, which multiplies the signal of each predetermined unit by receiving windowing data, and then outputs a signal to a Fourier transform (FFT) processing unit 114. It supplies and converts the subcarriers arranged on the frequency axis into symbol streams arranged on the time axis.
- FFT Fourier transform
- the converted symbol stream performs a descrambling process opposite to the scrambling process at the time of transmission in the descrambling unit 115.
- the descrambled symbol stream is supplied to the symbol selector 1 16.
- the symbol selection unit 116 performs a process of selecting a symbol other than the null symbol inserted by the null symbol insertion unit 104 (see FIG. 6) at the time of transmission (ie, removing the null symbol).
- the symbol stream from which the null symbols have been removed is supplied to the bit extraction unit 117, the encoded bits are extracted, and the extracted bit data is supplied to the decoding unit 118. Then, the decoded information bit stream is obtained at the terminal 119.
- the symbols to be extracted by the symbol selector 1 16 differ depending on the transmission rate of the transmitted information bitstream. That is, as shown in Fig. 7, the position of the null symbol with an amplitude of 0 inserted at the time of transmission varies depending on the transmission rate. For each transmission rate, only the symbol indicated by the symbol ⁇ is extracted. Perform the following processing. By performing this processing, transmission at transmission rates from 32 kbps to 128 kbps can be performed using the same communication bandwidth.
- the portion where the null symbol is inserted in the transmission processing described in the first embodiment can be used for communication of another system.
- multiplex communication can be performed efficiently.
- the transmission process shown in Fig. 6 when transmitting an information bit stream at a rate of 64 kbps, communication of another system is performed at the insertion position of a null symbol, and two The transmission of an information bitstream at a rate of 64 kbps in the system is possible in one transmission band.
- a rate of 32 kbps transmission of an information bit stream of a rate of 32 kbps in four systems is possible in one transmission band.
- transmission at a rate of 96 kbps and transmission at a rate of 32 kbps can be performed in one transmission band.
- This embodiment is also an example in which the present invention is applied to a cellular wireless telephone system.
- a single transmitter performs multiplex transmission.
- This multiplex transmission can be applied, for example, when a base station transmits transmission signals of a plurality of systems simultaneously.
- This embodiment is basically the same as the process described in the first embodiment except for the configuration for performing multiplex communication, and the configuration of the receiving system is omitted.
- FIG. 11 is a diagram showing a transmission configuration according to the present embodiment.
- the information bit stream of the number N of channels of channel 1, channel 2... channel N (N is an arbitrary integer) is represented by terminals 12 1 a, 1 2 1- ⁇ 1 2 1 n.
- the information bit stream of each channel obtained at each of the terminals 1 2 1 a to 1 2 1 n is assumed to be a bit stream of the same transmission rate here, and each is different. It is supplied to the coding sections 122a, 122b ... 122n to individually perform coding processing such as encoding and interleaving.
- the bit streams of the channels coded by the coding sections 122a to 122n are separated into separate symbol mapping sections 123a, 123b ... 1 2 respectively.
- Fig. 12 is a simplified diagram of the concept of processing in the mixing circuit 124. In this example, for example, a symbol stream with four channels from channel 1 to channel 4 is used as one system. Into a symbol stream of
- the symbol stream of channel 1 is obtained at terminals 124a of mixing circuit 124, and the symbol stream of channel 2 is obtained at terminals 124b of mixing circuit 124.
- the symbol stream of channel 3 is obtained at terminal 124 c of mixing circuit 124, and the symbol stream of channel 4 is obtained at terminal 124 of mixing circuit 124.
- the switch contact 124m constituting the mixing circuit 124 performs a process of periodically selecting the terminals 124a to 124d in sequence and outputs the result.
- FIG. 13 is a diagram showing an example of this mixed state. For example, in the state shown in A, B, C, and D of FIG.
- the symbols of each channel are selected in order to obtain a mixed stream of one system as shown in E of Fig.13.
- the stream of each channel is a symbol of an information bit stream of a rate of 32 kbps, an information bit stream of a rate of 128 kbps The corresponding symbol stream is obtained.
- the transmission timing of the symbols on each channel is not synchronized, synchronization using buffer memory is required.
- the transmission symbol mixed by the mixing circuit 124 is scrambled by the random phase shift in the random phase shift section 125 (or other scramble processing). Processing), and supplies the scrambled transmission symbols to an inverse Fourier transform (IFFT) processing section 126, which performs an inverse fast Fourier transform operation.
- IFFT inverse Fourier transform
- the symbol stream arranged on the time axis is converted into a multicarrier signal having a subcarrier arranged on the frequency axis.
- the signal converted by the inverse free-transformation processing unit 126 is supplied to a guard time addition unit 127 to add a guard time, and the windowing processing unit 128 converts the signal into a signal of a predetermined unit.
- the transmission signal multiplied by the windowing data is supplied to a transmission processing unit 1229, where the high-frequency signal is convolved and frequency-converted into a predetermined transmission frequency band, and the frequency-converted transmission signal is transmitted from the antenna 130. Transmit wirelessly.
- the symbol appearance period of each channel in the multiplexed symbol stream (E in Fig. 13). Is 4, but the maximum number of multiplexed channels is not limited to this.
- the appearance cycle of the symbol of the panel is 2 n , the same as the maximum number of multiplexes. If the number of channels used in actual communication is smaller than the maximum multiplexing number, the unused symbols described in the first embodiment (null symbols whose amplitude is smaller) are used as symbols of unused channels. 0 symbol) Just do it.
- FIG. 14 This embodiment is also an example in which the present invention is applied to a cellular radio telephone system.
- the present invention is also an example in which the present invention is applied to a cellular radio telephone system.
- multiplex transmission is performed from one transmitter. Therefore, the same reference numerals are given to portions corresponding to the second embodiment, and detailed description thereof will be omitted.
- FIG. 14 shows a transmission configuration in the present embodiment.
- the information bitstream of three channels, channel 1, channel 2, and channel 3 is obtained at terminals 13a, 13b, and 13c. I do.
- the transmission rate of each channel is, for example, 32 kbps for channel 1 and 2 kbps, respectively, and 3 kbps for each channel.
- the information bit stream of each channel obtained at each of the terminals 13 1a to 13 1c is a separate coding section 13 2a, 13
- the bit stream of channel 1 and channel 2 coded by 32b is the symbol mapping unit for each channel.
- bit stream of channel 3 is divided into two bit streams, and one bit stream is sent to the symbol mapping unit 133c.
- the bit stream of the other system is supplied to a symbol mapping unit 133d, and each is separately mapped to a transmission symbol.
- Fig. 15 shows an example of the multiplexing state here, where the symbol streams of channel 3 divided into two systems are periodically arranged at the same interval, and the channel is interposed between them.
- a symbol stream of 1 and a symbol stream of channel 2 are periodically arranged. That is, for example, channel 1, channel 3, channel 2
- This multiplexed symbol stream is subjected to scrambling (or other scrambling) by random phase shifting in a random phase shifter 125, and the scrambled transmission symbol Is supplied to the inverse Fourier transform (IFFT) processing unit 126.
- IFFT inverse Fourier transform
- a symbol stream arranged on the time axis is converted into a multicarrier signal having subcarriers arranged on the frequency axis.
- the signal converted by the inverse Fourier transform processing unit 126 is supplied to a guard time adding unit 127 to add a guard time, and the windowing processing unit 128 converts the signal into a signal of a predetermined unit. Multiply by the windowing data.
- the transmission signal multiplied by the windowing data is supplied to a transmission processing unit 12 9, where the high-frequency signal is frequency-converted to a predetermined transmission frequency band, and the frequency-converted transmission signal is converted to an antenna 13. Radio transmission from 0.
- a signal of an arbitrary channel can be extracted and processed. That is, when extracting the signal of channel 1 or channel 2 from the transmission signal multiplexed in the state shown in FIG. 15, symbols of every four periods are extracted.
- the signal of the channel can be received and the signal of channel 3 is extracted, the signal of the channel can be received by extracting the symbol every two periods.
- N is a positive integer of l, 2, 3,...,
- M is the maximum transmission rate in the corresponding band.
- a rate of the value between the rates set by the equation (2) may be set, such as 96 kbps described in the first embodiment.
- FIGS. This embodiment is also an example in which the present invention is applied to a cellular wireless telephone system.
- multiple transmissions are performed from a plurality of transmitters.
- this corresponds to a case where multiplex transmission is simultaneously performed from a plurality of terminal devices and received collectively by a base station.
- FIG. 16 is a diagram showing a transmission configuration in the present embodiment.
- the information bitstreams of channel 1 to channel N (where N is an arbitrary integer) are individually obtained at terminals 14 1 a to 14 1 n of different transmitters, respectively.
- the transmitters have basically the same configuration.
- the information bit stream obtained at terminal 141a is a code stream.
- the coding section 1442a performs coding processing such as encoding and interleaving.
- Each bit coded by the coding unit 1442a is supplied to a symbol mapping unit 1443a, and is mapped to a transmission symbol.
- the transmission symbol generated by the symbol mapping section 1443a is subjected to scrambling (or other scrambling) by random phase shifting in the random phase shifting section 144a.
- the scrambled transmission symbols are supplied to an inverse Fourier transform (IFFT) processing unit 144a, and the symbol stream arranged on the time axis is calculated by inverse fast Fourier transform. Converts to a multicarrier signal in which a subcarrier is arranged on the frequency axis.
- the signal converted by the inverse free-transformation processing section 144a is subjected to internal channel selection processing by the internal channel selection section 144a, and the multi-channel having undergone the internal channel selection processing is processed.
- the rear signal is supplied to a transmission processing section 147a, the high-frequency signal is convolved and frequency-converted into a predetermined transmission frequency band, and the frequency-converted transmission signal is wirelessly transmitted from an antenna 148a.
- Figure 17 shows the configuration of the internal channel selection section 144a.
- the signal obtained at the terminal 15 1 from the preceding circuit is supplied to the symbol repetition unit 15 2, and a number of symbol repetition processes are performed according to the transmission rate at that time.
- the maximum transmission rate in one transmission band is 128 kbps
- the subcarrier interval on the transmission path of the wirelessly transmitted multi-carrier signal is 4 kHz
- one channel is 32 kbps.
- the preceding inverse Fourier transform processing unit 144a performs a conversion process into a multi-carrier signal having a subcarrier interval of 16 kHz.
- the symbol repetition unit 152 performs a process of repeating the symbol component of this signal four times, and converts it into a signal at 4 kHz intervals. For example, as shown in FIG. 17, the waveform shown at the input of symbol repetition unit 152 is converted into a waveform that is repeated four times in symbol repetition unit 152. By repeating this inverse Fourier-transformed symbol stream for multiple times, an effect equivalent to inserting a null symbol into a subcarrier not used by the corresponding channel can be obtained. Become.
- the signal repeated in this symbol repetition unit 15 2 At 153 is multiplied by the offset frequency output by offset frequency generator 154. As a result of this multiplication, a phase rotation occurs in each symbol by the frequency offset of the corresponding channel. If the frequency offset of the corresponding channel is 0 Hz, multiplication by a constant is performed. That is, the symbol sequence multiplied by the multiplier 153 determines which channel to use the subcarrier assigned to.
- the signal multiplied by the offset frequency is supplied to the windowing processor 155, multiplied by the transmission windowing data for each predetermined unit, and supplied from the terminal 156 to the transmission processor 147a. I do.
- Figure 18 shows an example of the state of the signal that is transmitted on each channel.
- the maximum transmission rate in one transmission band is 128 kbps
- the data of this 128 kbps transmission rate is transmitted by a multi-carrier signal with subcarriers at 4 kHz intervals.
- one transmitter uses one transmission band from four transmitters, and multiplexes data with a transmission rate of 32 kbps from each transmitter to this one transmission band. It is shown.
- A, B, C, and D in Fig. 18 show the transmission signals of channel 1, channel 2, channel 3, and channel 4 transmitted from each transmitter, respectively.
- the signal is
- the frequency position where the sub-carrier exists in each channel is set as the interval of 16 kHz from the reference frequency fc for channel 1 as shown in A of FIG.
- channel 2 is set at 16 kHz from the frequency position shifted by 4 kHz from frequency fc
- channel 3 is set as shown in C of FIG. 18.
- the frequency ⁇ c force, etc. is set to be 16 kHz from the frequency position shifted by 8 kHz, and as shown in FIG. 18D, the frequency ⁇ c force, etc.
- the signals on each of these channels which are spaced 16 kHz apart from the shifted frequency position of 12 kHz, are transmitted by radio, and on the radio transmission path, as shown in E in Fig. 18 In this state, subcarriers are arranged at intervals of 4 kHz, and signals of four channels are multiplex-transmitted in one transmission band.
- a signal of a transmission rate of 32 kbps handled by the channel is used as a subcarrier having a width of 16 kHz. Only the process of converting into a group of carriers is sufficient, and the amount of processing in the inverse Fourier transform processing unit can be made significantly smaller than the amount of processing required at the subcarrier interval in the system.
- the rate of the transmission is The calculation is performed by the inverse Fourier transform processing unit of the scale appropriate for the communication of the communication (that is, twice the number of samples is output as in the case of the communication of 32 kbps).
- the transmission signal can be generated by the same processing at any transmission rate.
- the processing circuit provided in each transmitter (terminal device) only needs to include an inverse Fourier transform processing circuit having a capacity corresponding to the transmission rate at which the transmission is performed by the device. Therefore, there is no need to provide the capability to generate a multicarrier signal with a subcarrier interval specified in the prepared transmission band, and the configuration of the terminal device can be simplified.
- FIG. 19 shows an example of a configuration in which signals thus multiplexed and transmitted are collectively received by, for example, a base station.
- the reception processing unit 162 to which the antenna 161 is connected receives a signal in a predetermined transmission frequency band and converts it into a baseband signal.
- the converted baseband signal is supplied to a windowing processing unit 1663, and after multiplying the signal for each predetermined unit by receiving windowing data, the signal is supplied to a Fourier transform (FFT) processing unit 1664.
- FFT Fourier transform
- the conversion process here is a process for converting all subcarriers arranged in the received transmission band.
- the converted symbol stream is subjected to a descrambling process which is the reverse of the scrambling process at the time of transmission in the random phase shift section 1665.
- the descrambled symbol stream is processed by a demultiplexer (demultiplexer) 166 to demultiplex the symbols multiplexed in one transmission band for each channel.
- the symbol streams separated for each channel are supplied to the bit extraction units 1667a, 1667b,... 1667n for each channel.
- the bit stream is individually extracted to obtain the received bit stream, and the received bit stream is decoded by each channel. And decodes the information bitstream for each channel individually to the terminals 1669a, 169b '' '' 16 '' for each channel. Get to 9 n.
- Fig. 20 is a simplified diagram showing the concept of processing in the separation circuit 166.
- four channels channel 1 to channel 4, multiplexed in one symbol stream. It separates channel symbol streams.
- the multiplexed symbol stream obtained at the switch contact 166 m constituting the demultiplexing circuit 166 is connected to the four terminals 166 a to 166 d for each symbol.
- Supply in order Is switched periodically. By switching in this way
- the symbol stream of channel 1 is obtained at terminal 166a, the symbol stream of channel 2 is obtained at terminal 166b, and the symbol stream of channel 3 is obtained.
- a stream is obtained at terminal 166c, and a symbol stream of channel 4 is obtained at terminal 166d.
- Fig. 21 is a diagram showing an example of this separated state.
- the signal shown in A of Fig. 21 is a symbol signal obtained by receiving a signal in one transmission band in which four channel signals are multiplexed.
- the symbols arranged at regular intervals in the stream are a mixture of four-channel symbols.
- each channel is switched as shown in B, C, D, and E in FIG. Are separated and output.
- FIGS. This embodiment is also an example in which the present invention is applied to a cellular wireless telephone system.
- the processing in the embodiment described so far includes a signal multiplexed and transmitted in one transmission band. It is designed to receive any channel of the user. For example, this corresponds to a case where an arbitrary channel is received by a terminal device from signals multiplexed and transmitted from a base station at the same time.
- FIG. 22 is a diagram showing a receiving configuration in the present embodiment.
- a signal in a predetermined transmission frequency band is received by a reception processing section 172 to which the antenna 171 is connected, and is converted into a baseband signal.
- the received signal of the selected channel is supplied to the multi-carrier processing unit 174, and the Fourier transform is performed.
- the subcarriers arranged on the frequency axis are converted into symbol streams arranged on the time axis by processing. It should be noted that other processes required for multi-carrier processing, such as windowing processing and random phase shift, are also executed by the multi-carrier processing section 174.
- the converted symbol stream is supplied to a bit extracting section 175 to extract coded bits, and the extracted bit data is supplied to a decoding section 176 to be decoded.
- the decoded information bitstream is obtained at pin 177.
- FIG. 23 is a diagram illustrating a configuration example of the channel selection unit 173
- a signal in which subcarriers are arranged at 4 kHz intervals on the frequency axis is 250 / Entered for seconds.
- the signal obtained at this terminal 18 1 is supplied directly to the selector 18 1 a, and is also delayed via a delay circuit 18 1 b and supplied to the selector 18 1 a, and the selector 18 1 a By the selection in, a process of repeating the signal symbol is performed.
- the output of the selector 18 1 a is supplied to a subtracter 18 2, and at the same time, by a delay circuit 18 3, the time is 1/2 1 of the modulation time of one symbol (that is, 125 seconds in this case).
- the delayed signal is supplied to a subtracter 182, and the difference between the two signals is extracted.
- the difference signal output from the subtractor 1822 is supplied to a multiplier 1995, where the difference signal is multiplied by the correction signal from the offset frequency correction signal generator 1995a.
- the output signal of the multiplier 195 is directly supplied to the adder 186, and the signal delayed by the delay circuit 185 is supplied to the adder 186, so that the sum signal of the two signals is obtained. Is obtained at terminal 192.
- the signal delayed by 3 is supplied to the adder 187, and an added signal of both signals is obtained.
- the delayed signal is supplied to the subtractor 188, and the difference between the two signals is extracted.
- the signal of the difference is obtained at the terminal 193 via the multiplier 197.
- the output signal of the adder 187 is directly supplied to the adder 190, and the signal delayed by the delay circuit 189 is supplied to the adder 190, so that the sum signal of both signals is obtained. Obtained at terminal 194.
- each of the multipliers 195, 196, and 197 the correction signals from the offset signal correction signal generators 195a, 196a, and 197a are multiplied. This offset frequency correction processing will be described later.
- each subcarrier of channels 1 to 4 A signal in which the keys are sequentially arranged at intervals of 4 kHz is input for 250 ⁇ s.
- the first half of this signal is divided into 125 seconds and the second half of 125 seconds, and the result of subtraction by the subtractor 182 and the result of addition by the adder 187 are added to each other.
- the output of the adder 1 8 7 subcarrier number from the original signal becomes 1 Zeta 2 1, FIG.
- a signal obtained by subtracting the delayed signal by the subtractor 188 and a signal obtained by adding the delayed signal by the adder 190 are generated.
- the signal added by the adder 190 is only the subcarrier of the signal of channel 1 as shown in C of FIG.
- the signal subtracted by the subtracter 188 is only the subcarrier of the signal of channel 3 as shown in D of FIG.
- the number of subcarriers is halved from the original signal, and as shown by the triangle in FIG. 24, the even-numbered subcarriers of channel 2 and channel 4 are output. Only rear. From the output of the subtractor 182, a signal obtained by adding the delayed signal by the adder 186 and a signal obtained by subtracting the delayed signal by the subtractor 184 are generated. The signal added by the adder 186 is only the subcarrier of the signal of channel 2 as shown by F in FIG. Subtractor 1 8
- the signal subtracted by 4 is only the subcarrier of the signal of channel 4, as shown by G in FIG.
- the signals obtained at terminals 191, 1992, 1993, and 194 are subjected to FF ⁇ processing (fast Fourier transform processing) in the subsequent stage, and subcarriers are extracted.
- FF ⁇ processing fast Fourier transform processing
- the signals of channels 2 to 4 are in a state where the offset frequency is convolved.
- the subcarrier interval of the multiplexed signal is fs [Hz]
- the channel Channel 2 has an offset frequency of fs [Hz]
- channel 3 has an offset frequency of 2 fs [Hz]
- channel 4 has an offset frequency of 3 fs [Hz]. Therefore, in order to remove these offsets, the multipliers 1995, 196, and 197 multiply by a sine wave having a negative offset frequency, and then the terminals 191, 192, Output signal to be supplied to 193 and 194.
- the output is obtained by multiplying the signal of channel 2 by 1 fs [Hz], that of channel 3 by 1 fs [Hz], and that of channel 4 by 3 fs [Hz]. Become.
- the correction signal generator 195a generates the signal of exp (-j27 ⁇ (iZMX1)) on channel 2 (output of terminal 1992), and converts that signal. This is performed by multiplying by a multiplier 1995.
- a signal of exp (-j2 ⁇ (i / Mx2)) is generated by the correction signal generator 197a, and the signal is multiplied. This is done by multiplying by the unit 19 7.
- channel 4 output of terminal 19 1), first, exp (
- M shown as a correction signal is the number of symbols input to the channel selection means 173 during 250 0sec.
- I is a subscript indicating the number of the input symbol.
- the channel selection unit 173 selects each channel.
- the subcarriers for each channel are separated, and in the circuits after the channel selection unit 173, only the subcarriers of the channels that need to be received are processed, so that the information bit stream of the corresponding channel is processed. Team.
- the channel selector shown in Fig. 23 is configured to separate all four channels of multiplexed and transmitted signals.However, when only one channel signal is required
- a channel selection unit 173 'shown in FIG. 25 may be used. That is, the received signal (baseband signal) obtained at the terminal 201 is subjected to symbol repetition processing using the selector 201a and the delay circuit 201b, and then supplied to the arithmetic unit 202. to together, supplying 1 Z 2 1 signal obtained by time delay of the delay circuit 2 0 3 by one modulation time calculating unit 2 0 2.
- the operation unit 202 is a circuit that performs one of an addition process and a subtraction process under the control of the control unit 207.
- the arithmetic unit 204 is a circuit that performs one of an addition process and a subtraction process under the control of the control unit 207.
- the arithmetic output of the arithmetic unit 204 is supplied to the terminal 206 after removing the offset frequency by multiplication with the sine wave by the multiplier 209, and then supplied to the circuit at the subsequent stage from the terminal 206. .
- the offset frequency to be corrected by the multipliers 208 and 209 is determined by the control of the control unit 207.
- the channel selection unit 17 shown in FIG. 23 is controlled by the control unit 207 of the addition process or the subtraction process in the calculation unit 202 and the calculation unit 204. It can be set to the same state as the selection processing state of each channel in 3 and can be selected from the multiplexed 4 channel signals. Only the subcarriers of this channel can be extracted.
- the channel selection unit to be extracted for example, the channel selection unit 17 shown in FIG. 26 is used.
- the sub-channel of one of the multiplexed two-channel signals can be controlled by the control unit 215 of the addition process or the subtraction process in the arithmetic unit 211. Only the lya can be extracted.
- the terminal equipment For example, if the maximum transmission rate in one transmission band is 128 kbps, and the terminal equipment that wants to support up to 64 kbps as the maximum transmission rate, a low-speed rate such as 8 kbps is used.
- the terminal equipment When receiving a signal, the terminal equipment is equipped with a channel selector corresponding to the maximum transmission rate (64 kbps), and is processed as a 64 kbps multi-carrier signal.
- the upper subcarrier is the symbol stream on the time axis.
- processing may be performed to select a desired channel from the symbol stream.
- the receiver for the channel is connected to the processing unit corresponding to the arithmetic unit 204 and the delay circuit 205 in FIG. 25 in a serial manner and performs the same processing. Can be reduced to 1 2N (N is the number of connected processing means) of the signal line of the terminal 201.
- N is the number of connected processing means
- the number of stages inside the channel selection means can be selected as desired, and this value is determined by the maximum transmission rate supported by the receiver. Note that the delay amount at each stage is 1 Z 2 j (j indicates the number of stages).
- a receiver for selecting and receiving a desired channel from signals multiplexed and transmitted in this manner is a multi-carrier signal. It can also be applied to receivers for other systems such as DAB (Digital Audio Broadcasting), in which broadcast signals of multiple channels are multiplexed and transmitted. By applying to this receiver, the receiver only needs to have a function of transforming only one channel subcarrier as the Fourier transform means provided in the receiver. The configuration of the receiver can be simplified as compared with a case in which a device capable of converting all the subcarriers of the band is provided.
- FIG. The present embodiment is an example in which the present invention is applied to a cellular wireless telephone system. When a plurality of channels are multiplexed and transmitted in one transmission band, any one of the multiplexed channels is pirated. This is a lot channel.
- FIG. 27 is a diagram illustrating a transmission configuration according to the present embodiment.
- an information bit stream of channel number N from channel 1 to channel N (where N is an arbitrary integer) is obtained at terminals 22 1 a-22 1 n and Pilot channel bit on pin 221p A stream shall be obtained.
- a predetermined known signal is supplied to the terminal 221 P as pilot channel data.
- some control data (for example, an ID for recognizing a base station) may be transmitted.
- channel channels other than the pilot channel are referred to as traffic channels.
- the information bitstream of each traffic channel obtained at terminals 22a to 2211n is assumed to be a bitstream of the same transmission rate here.
- the data is supplied to 22 n to perform individual coding processing such as encoding and in-night recording.
- the bit stream of each channel coded by the coding units 222 a to 222 n is supplied to another symbol mapping unit 222 a to 222 n, respectively. Each channel is individually mapped to a transmission symbol. Also, terminals 2 2
- the bit stream of the pilot channel obtained in 1p is directly supplied to the symbol mapping section 223p here, and is mapped to the transmission symbol.
- the transmission symbols generated by the symbol mapping units 2 23 a to 2 23 ⁇ and 22 3 p for each channel are supplied to a mixing circuit (multiplexer) 2 24, and a single system Mixed into the symbol stream.
- the mixing configuration of the mixing circuit 224 may be the same as the mixing configuration of the mixing circuit 124 described with reference to FIG. 12 in the second embodiment, for example.
- the transmission symbol blended by the mixing circuit 22 is converted into subcarriers arranged on the frequency axis, such as scrambling processing, inverse Fourier transform processing, and windowing processing, in the multi-carrier processing unit 225.
- the generated multi-carrier signal is processed, and the generated multi-carrier signal is supplied to the transmission processing unit 222.
- FIG. 29 shows an example of a multiplexed state in one transmission band in the case of the channel configuration including the pilot channel.
- the traffic channels of channels 1 to 3 are multiplexed with one pilot channel, and the subcarriers of each channel are arranged in order.
- FIG. 28 shows a configuration for receiving a signal transmitted in this manner.
- the reception processing unit 232 to which the antenna 231 is connected receives a signal in a predetermined transmission frequency band and converts it into a baseband signal.
- the converted baseband signal is supplied to first and second channel selectors 2333a and 2333b.
- the first channel selector 2 33 a performs a process of selecting a subcarrier of the traffic channel to be received.
- the second channel selection section 2333b performs a process of selecting a subcarrier of the pilot channel.
- the subcarriers selected by the channel selection sections 233a and 233b are separately supplied to the multicarrier processing sections 234a and 234b, respectively, and Fourier transform processing is performed. Performs the process of converting the subcarriers on the frequency axis into symbol streams on the time axis.
- the symbol stream of the predetermined traffic channel obtained by the multi-carrier processing unit 234a is supplied to the channel equalizer 235.
- This equalizer 235 estimates the state of the transmission path based on the state of the known signal received on the pilot channel, and based on the estimated state of the transmission path, the symbol received on the traffic channel. Performs equalization processing of the transmission path of the signal, and performs synchronous detection of the symbol subjected to the equalization processing.
- the detected symbol is supplied to the bit extraction section 236.
- To extract the coded bits supply the extracted bit data to the decoding section 237, and decode the information bit stream.
- the data received by the pilot channel is supplied to a control unit of a terminal device (not shown) to perform a control process based on the data.
- the first and second channel selection units 233a and 233b are configured, for example, as shown in FIG.
- the first channel selection section 233a performs symbol repetition processing using a selector 241a and a delay circuit 241b on a signal obtained at the terminal 221 from the preceding circuit. After that, it is supplied to the operation unit 242 and the delay circuit
- the operation unit 242 is a circuit in which one of an addition process and a subtraction process is performed under the control of the control unit 247.
- the offset frequency is removed by multiplying the output of the operation unit 242 by the sine wave specified by the control unit 247 by the multiplier 248.
- the operation unit 244 is a circuit that performs one of an addition process and a subtraction process under the control of the control unit 247. After the offset output is removed by multiplying the arithmetic output of the arithmetic unit 244 by the sine wave specified by the control unit 247 by the multiplier 249, the circuit downstream from the terminal 246 is To supply.
- the signal obtained from the circuit at the preceding stage at terminal 25 1 is added to the selector 25 l a and the delay circuit 25
- the signal After performing symbol repetition processing using 1b, the signal is supplied to the operation unit 25 2, and the signal delayed by 1 Z 21 of one modulation time by the delay circuit 25 3 is transmitted to the operation unit 25 2.
- Arithmetic unit 2 5 Reference numeral 2 denotes a circuit for performing one of an addition process and a subtraction process under the control of the control unit 247.
- the offset frequency is removed by multiplying the output of the arithmetic unit 252 by a sine wave instructed by the control unit 2447 by the multiplier 2570. This signal is supplied directly to the arithmetic section 255 and the delay circuit 255 provides one modulation time.
- the operation unit 254 is a circuit that performs one of an addition process and a subtraction process under the control of the control unit 247.
- the offset output is removed by multiplying the arithmetic output of the arithmetic unit 254 by the sine wave specified by the control unit 247 by the multiplier 258, and then output from the terminal 256 to the subsequent circuit. Supply.
- the first channel selection unit 2333a can extract a desired subcarrier of the traffic channel based on the control of the control unit 247.
- the other channel selectors 2333b can extract pilot carriers of pilot channels.
- FIG. 31 shows an example of this case.
- the time slots TS 1, TS 2, TS 3 ′ — and the subcarriers of the logical channels CH 1 to CH 4 are provided for each time slot.
- the sequence of has been changed.
- it is a periodic change with four time slots as one cycle.
- the correspondence between the logical channel and the physical channel can be obtained by using a hopping pattern in an existing frequency hopping system.
- Fig. 32 shows an example of this case.
- the communication time T a is an array of bands F 1, F 2, F 3, F 4, F 5, and F 6 from the lower frequency
- the communication time T b, T c, T d The arrangement of bands is changed for each interval unit. Also in this case, it is changed periodically. By performing frequency hopping in this way, a greater frequency diversity effect can be obtained.
- the processing for changing the arrangement of subcarriers in each band shown in FIG. 31 and the frequency hopping processing for each band shown in FIG. 32 may be used together. Further, in each of the above-described embodiments, the details of the modulation / demodulation processing when transmission is performed using a multi-carrier signal have not been described.
- the signal is transmitted after differential modulation (phase modulation or amplitude modulation) is performed between adjacent ones of the subcarriers assigned to that channel, and then received.
- reverse demodulation processing ie, differential demodulation processing between adjacent subcarriers assigned to the channel
- This process can be applied to uplink communication from a terminal device to a base station, for example, in a wireless telephone system such as a cellular system. Further, the present invention can be applied to downlink communication from a base station to a terminal device.
- the subcarriers adjacent to each other on the frequency axis are Transmission may be performed after performing differential modulation (phase modulation or amplitude modulation), and the receiving side may perform reverse demodulation processing (ie, differential demodulation processing between adjacent subcarriers).
- This processing can also be applied to uplink communication from a terminal device to a base station in a wireless telephone system such as a cellular system. It can also be applied to downlink communication from a base station to a terminal device.
- the number of subcarriers is not 2 to the Nth power described in each embodiment. It is also applicable to cases.
Description
Claims
Priority Applications (5)
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DE69920388T DE69920388T2 (de) | 1998-07-13 | 1999-07-09 | Mehrträgerkommunikationsverfahren, Sender und Empfänger |
EP99929781A EP1014609B1 (en) | 1998-07-13 | 1999-07-09 | Multicarrier communication method, transmitter and receiver |
US09/508,425 US6563881B1 (en) | 1998-07-13 | 1999-07-09 | Communication method and transmitter with transmission symbols arranged at intervals on a frequency axis |
KR1020007002585A KR100620087B1 (ko) | 1998-07-13 | 1999-07-09 | 통신방법, 송신기 및 수신기 |
JP2000559665A JP4310920B2 (ja) | 1998-07-13 | 1999-07-09 | 送信機、送信方法、受信機及び受信方法 |
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JP10/197574 | 1998-07-13 | ||
JP19757498 | 1998-07-13 |
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WO2000003508A1 true WO2000003508A1 (fr) | 2000-01-20 |
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PCT/JP1999/003734 WO2000003508A1 (fr) | 1998-07-13 | 1999-07-09 | Procede de communication, emetteur, et recepteur |
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US (1) | US6563881B1 (ja) |
EP (1) | EP1014609B1 (ja) |
JP (1) | JP4310920B2 (ja) |
KR (1) | KR100620087B1 (ja) |
DE (1) | DE69920388T2 (ja) |
WO (1) | WO2000003508A1 (ja) |
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JP2001308818A (ja) * | 2000-02-18 | 2001-11-02 | Sony Corp | 信号成分分離装置、フィルタ装置、受信装置、通信装置、および、通信方法 |
JP2001358695A (ja) * | 2000-04-18 | 2001-12-26 | Lucent Technol Inc | 直交周波数分割多重ベースのスペクトル拡散多重アクセスシステムにおけるパイロット使用 |
JP2002190788A (ja) * | 2000-03-17 | 2002-07-05 | Matsushita Electric Ind Co Ltd | 無線通信装置および無線通信方法 |
EP1128592A3 (en) * | 2000-02-23 | 2003-09-17 | NTT DoCoMo, Inc. | Multi-carrier CDMA and channel estimation |
US7965781B2 (en) | 2000-02-18 | 2011-06-21 | Sony Corporation | Signal component demultiplexing apparatus, filter apparatus, receiving apparatus, communication apparatus, and communication method |
US8351405B2 (en) | 2006-07-14 | 2013-01-08 | Qualcomm Incorporated | Method and apparatus for signaling beacons in a communication system |
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Also Published As
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US6563881B1 (en) | 2003-05-13 |
EP1014609B1 (en) | 2004-09-22 |
JP4310920B2 (ja) | 2009-08-12 |
KR100620087B1 (ko) | 2006-09-05 |
KR20010023901A (ko) | 2001-03-26 |
DE69920388T2 (de) | 2006-02-23 |
EP1014609A1 (en) | 2000-06-28 |
EP1014609A4 (en) | 2003-02-05 |
DE69920388D1 (de) | 2004-10-28 |
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