WO1999056442B1 - Transmitter/receiver for gmsk and offset-qam - Google Patents

Transmitter/receiver for gmsk and offset-qam

Info

Publication number
WO1999056442B1
WO1999056442B1 PCT/US1999/007021 US9907021W WO9956442B1 WO 1999056442 B1 WO1999056442 B1 WO 1999056442B1 US 9907021 W US9907021 W US 9907021W WO 9956442 B1 WO9956442 B1 WO 9956442B1
Authority
WO
WIPO (PCT)
Prior art keywords
symbols
information
receiver
indicative
signal
Prior art date
Application number
PCT/US1999/007021
Other languages
French (fr)
Other versions
WO1999056442A3 (en
WO1999056442A2 (en
Inventor
Paul W Dent
Original Assignee
Ericsson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Priority to EEP200000622A priority Critical patent/EE200000622A/en
Priority to AU36373/99A priority patent/AU755079B2/en
Priority to JP2000546497A priority patent/JP2002513247A/en
Priority to BR9910013-4A priority patent/BR9910013A/en
Priority to KR1020007011974A priority patent/KR20010043092A/en
Priority to EP99918454A priority patent/EP1075752B1/en
Publication of WO1999056442A2 publication Critical patent/WO1999056442A2/en
Publication of WO1999056442A3 publication Critical patent/WO1999056442A3/en
Publication of WO1999056442B1 publication Critical patent/WO1999056442B1/en
Priority to HK02100898.1A priority patent/HK1039424A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • 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
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03184—Details concerning the metric
    • H04L25/03197—Details concerning the metric methods of calculation involving metrics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03292—Arrangements for operating in conjunction with other apparatus with channel estimation circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3488—Multiresolution systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Artificial Intelligence (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A transmitter encodes a number 2N data bits by using N data bits to select one of 2N levels of a cosine wave and the other N data bits to select one of 2N levels of a sine wave. The modulation attains the cosine wave levels at instants offset by half an N-bit symbol interval with respect to the sine wave levels, and is called Offset QAM (OQAM). A received OQAM signal is amplified, filtered and digitized at a sampling rate of preferably only one sample per N-bit half-symbol interval. Successive N-bit half-symbols comprise information modulated alternately on a cosine and a sine carrier wave. The receiver may remove this successive rotation by applying successive derotations of successive digitized samples by like amounts. The derotated samples are then correlated with known sync half-symbols. The sync correlations determine a set of channel coefficients describing the dependence of each digitized sample on one or more unknown half-symbols. The computed channel estimates are then used to predict the expected received sample values for all possible sequences of successive unknown half-symbols that are to be decoded. Received samples are then compared with all possible expected values and a measure of disagreement or error metric computed. That sequence with the lowest cumulative error metric is used to determine the decoded symbol output. In other aspects of the invention, dual mode transmitters and receivers are disclosed that enable different types of modulation to be alternatively utilized in a same apparatus.

Claims

AMENDED CLAIMS[received by the International Bureau on 9 February 2000 (09.02.00); original claims 3, 20 and 21 amended; remaining claims unchanged (8 pages)]
1. A communications method for transmitting information bits from a transmitter to a receiver comprising the steps of: assembling the information bits into N-bit groups of bits to form half-symbols; encoding even numbered ones of said half-symbols into one of two to the power N possible amplitude levels of a cosine wave at even instants of a half-symbol clock and odd numbered ones of said half-symbols into one of the same number of amplitude levels of a sine wave at odd instants of said half-symbol clock; using said cosine and sine waves together to form complex symbols for transmission, each complex symbol carrying 2N information bits; transmitting said complex symbols as a transmission signal on a designated frequency channel to a receiver; receiving said transmission signal on said designated frequency channel and converting said received transmission signal to representative complex numerical values at a sampling rate of one complex sample per half-symbol interval; and forming a set of prerotated samples from said representative complex numerical values by rotating alternate ones of said representative complex numerical values by plus or minus 90 degrees in phase angle relative to the representative complex numerical values in between the alternate ones of the representative complex numerical values; processing said prerotated samples to recover said information bits.
2. The method of claim 1 , further comprising the step of forming the transmission signal by using filtering to smooth transitions between said amplitude levels of the cosine and sine waves.
3. A method for transmitting information bits from a transmitter to a receiver including the steps of: assembling said information bits into N-bit groups of bits to form half-symbols; encoding even numbered ones of the half-symbols into one of two to the power N possible amplitude levels of a cosine wave at even instants of a half-symbol clock and odd - -
numbered ones of said half-symbols into one of the same number of amplitude levels of a sine wave at odd instants of said half-symbol clock; using said cosine and sine waves together to form complex symbols for transmission, each complex symbol carrying 2N information bits; and transmitting said complex symbols to the receiver in a transmission signal that conveys the half-symbols interleaved with other half-symbols that are known to the receiver in advance.
4. The method of claim 3, further comprising the step of forming the transmission signal by using filtering to smooth transitions between said amplitude levels of the cosine and sine waves.
5. The method of claim 3 in which said known half-symbols are encoded into only two of the two to the power N possible amplitude levels of said cosine and sine waves.
6. The method of claim 5 in which said known half-symbols are encoded into only the greatest positive or the greatest negative amplitude levels of said cosine and sine waves.
7. A method of transmitting information bits to a receiver at either a first information rate or a second information rate, comprising the steps of: assembling said information bits into groups of unknown half-symbols, each containing a first number Nl of information bits when transmission at said first information rate is desired, and alternatively containing a second number N2 of information bits when transmission at said second information rate is desired; encoding even numbered ones of the unknown half-symbols into one of two to the power N possible amplitude levels of a cosine wave at even instants of a half-symbol clock and odd numbered ones of said unknown half-symbols into one of the same number of amplitude levels of a sine wave at odd instants of said half-symbol clock, wherein N=Nl when transmission at said first information rate is desired, and N^Nl when transmission at said second information rate is desired; using said cosine and sine waves together to form complex symbols for transmission, each complex symbol carrying 2N information bits; and transmitting said complex symbols to the receiver in a transmission signal that conveys the unknown half-symbols interleaved with other half-symbols that are known to the receiver in advance, wherein the other half-symbols each comprise a number N3 of information bits known to the receiver, wherein further N3 may alternatively be equal to Nl or N2 independently of whether transmission at said first or second information rate is desired.
8. The method of claim 7, further comprising the step of forming the transmission signal by using filtering to smooth transitions between said amplimde levels of the cosine and sine waves.
9. The method of claim 7, wherein the other half-symbols that are known to the receiver in advance each comprise Nl information bits known to the receiver, while the unknown half-symbols each comprise N2 information bits.
10. The method of claim 9 wherein said first number Nl equals one.
11. The method of claim 10, wherein said second number N2 equals two.
12. The method of claim 9, wherein said second number N2 equals two.
13. The method of claim 7, wherein said first number Nl equals one.
14. The method of claim 13, wherein said second Number N2 equals two.
15. The method of claim 7, wherein said second number N2 equals two.
16. A method of transmitting information bits to a receiver at either a first information rate or a second information rate, comprising the steps of: applying the same information bits to a first and a second modulator when transmission at said first information rate is desired, and alternatively applying half of the information bits to said first modulator and the other half to said second modulator when transmission at said second information rate is desired, thereby producing a first and a second modulated signal; and combining said first and said second modulated signals using respective first and second weighting factors to produce a signal for transmission.
17. The method of claim 16, wherein said first information rate is selected during transmission of bits known in advance to said receiver, and said second information rate is used during transmission of bits unknown in advance to said receiver.
18. The method of claim 16, wherein said first and second modulators each modulate the applied information bits using Gaussian Minimum Shift Keying (GMSK).
19. The method of claim 16, wherein said weighting factors are in a 2: 1 ratio relative to each other.
20. The method of claim 17, wherein known symbols form an equalizer training sequence for adapting said receiver to compensate for inter-symbol interference.
21. The method of claim 17, wherein known symbols alternatively comprise a first known symbol pattern when said first information rate is used, and a second known symbol pattern when said second information rate is used.
22. The method of claim 21, wherein said receiver detects which of said first or said second known symbol patterns was transmitted and adapts itself to decode information at said first information rate or said second information rate accordingly.
23. A receiver for decoding unknown information symbols interspersed with known information symbols transmitted using a signal modulated either with Gaussian Minimum Shift Keying (GMSK) or alternatively with Offset 16-Quadrature Amplitude Modulation (O-16QAM) and compensating for inter-symbol interference caused by a multipath propagation channel, comprising: state memory means for storing a plurality of states, each state comprising a decoded value-string and an associated path metric, each of said decoded value-strings corresponding to different hypotheses of information contained in signal samples already processed, and each of said associated path metrics being indicative of a likelihood that the corresponding hypothesis was a correct hypothesis; channel estimation means for estimating channel coefficients indicative of the phase and amplitude of each path of said multipath propagation based on received signal samples that correspond to said known information symbols; detection means for detecting whether said unknown information symbols were transmitted using said GMSK or said O-16QAM modulation and providing an equalizer mode indication signal; and
Niterbi processing means for controlling the processing of each successive signal sample to update each state of said state memory by extending the decoded value-string and updating the associated path metric, each updated state being derived from one of four previous states when said equalizer mode indication signal is indicative of O-16QAM, and alternatively derived from one of two previous states when said equalizer mode indication signal is indicative of GMSK.
24. The receiver of claim 23, wherein each value in said decoded value-string is indicative of either a binary 1 or a binary zero when said equalizer mode indication signal is indicative of GMSK, and alternatively each said value is indicative of a pair of binary bits when said equalizer mode indication signal is indicative of O-16QAM. - -
25. The receiver of claim 23 , wherein each value in said decoded value-string is indicative both of a decoded information symbol and of a likelihood that the decoded information symbol is correct.
26. The receiver of claim 23, wherein said known information symbols are transmitted using said GMSK modulation and said unknown information symbols are transmitted using said O-16QAM modulation.
27. The receiver of claim 23, wherein said known information symbols are transmitted using only those two symbols of said O-16QAM that attain the greatest positive or negative signal amplitude.
28. A receiver for decoding unknown information symbols interspersed with known information symbols transmitted using a signal modulated either with Offset Quadrature Phase Shift Keying (OQPSK) or alternatively with Offset 16-Quadrarure Amplitude Modulation (O-16QAM) and compensating for inter-symbol interference caused by a multipath propagation channel, comprising: state memory means for storing a plurality of states, each state comprising a decoded value-string and an associated path metric, each of said decoded value-strings corresponding to different hypotheses of information contained in signal samples already processed, and each of said associated path metrics being indicative of a likelihood that the corresponding hypothesis was a correct hypothesis; channel estimation means for estimating channel coefficients indicative of the phase and amplitude of each path of said multipath propagation based on received signal samples that correspond to said known mformation symbols; detection means for detecting whether said unknown mformation symbols were transmitted using said OQPSK or said O-16QAM modulation and providing an equalizer mode indication signal;
Viterbi processing means for controlling the processing of each successive signal sample to update each state of said state memory by extending the decoded value-string and - -
updating the associated path metric, each updated state being derived from one of four previous states when said equalizer mode indication signal is indicative of O-16QAM, and alternatively derived from one of two previous states when said equalizer mode indication signal is indicative of OQPSK.
29. The receiver of claim 28, wherein each value in said decoded value-string is indicative of either a binary 1 or a binary zero when said equalizer mode indication signal is indicative of OQPSK, and alternatively each said value is indicative of a pair of binary bits when said equalizer mode indication signal is indicative of O-16QAM.
30. The receiver of claim 28, wherein each value in said decoded value-string is indicative of a decoded information symbol and of a likelihood that the decoded information symbol is correct.
31. The receiver of claim 28, wherein said known information symbols are transmitted using said OQPSK modulation and said unknown information symbols are transmitted using said O-16QAM modulation.
32. The receiver of claim 28, wherein said known information symbols are transmitted using only those two symbols of said O-16QAM that attain the greatest positive or negative signal amplitude.
33. A transmitter for transmitting information alternatively using either Gaussian Minimum Shift Keying (GMSK) modulation or Offset Quadrature Amplitude Modulation (OQAM), comprising: at least two GMSK modulation means having inputs for associated binary information bit streams and providing corresponding modulated output signals; amplifying and combining means for amplifying each of said modulated output signals and combining the amplified signals in predetermined amplitude ratios; - -
control means for selecting said associated binary information bitstreams supplied to said at least two GMSK modulation means to all be identical to one another when said GMSK modulation is desired, and alternatively for selecting at least two of said binary information bitstreams supplied to said at least two GMSK modulation means to be different from one another when said OQAM modulation is desired.
34. The transmitter of claim 33, wherein said amplifying means are saturated power amplifiers.
35. The transmitter of claim 33, wherein said combining means is a directional coupler.
PCT/US1999/007021 1998-04-28 1999-04-27 Transmitter/receiver for gmsk and offset-qam WO1999056442A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EEP200000622A EE200000622A (en) 1998-04-28 1999-04-27 Transmitter-receiver for GMSK and offset-QAM
AU36373/99A AU755079B2 (en) 1998-04-28 1999-04-27 Transmitter/receiver for GMSK and offset-QAM
JP2000546497A JP2002513247A (en) 1998-04-28 1999-04-27 Transceiver for GMSK and offset-QAM
BR9910013-4A BR9910013A (en) 1998-04-28 1999-04-27 Process for transmitting bits of information, receiver for decoding unknown information symbols interspersed with known information symbols, and, transmitter for transmitting information
KR1020007011974A KR20010043092A (en) 1998-04-28 1999-04-27 Transmitter/receiver for gmsk and offset-qam
EP99918454A EP1075752B1 (en) 1998-04-28 1999-04-27 Transmitter/receiver for gmsk and offset-qam
HK02100898.1A HK1039424A1 (en) 1998-04-28 2002-02-05 Transmitter/receiver for gmsk and offset-qam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/066,669 US6185259B1 (en) 1996-06-12 1998-04-28 Transmitter/receiver for GMSK and offset-QAM
US09/066,669 1998-04-28

Publications (3)

Publication Number Publication Date
WO1999056442A2 WO1999056442A2 (en) 1999-11-04
WO1999056442A3 WO1999056442A3 (en) 2000-02-17
WO1999056442B1 true WO1999056442B1 (en) 2000-04-06

Family

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Family Applications (1)

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PCT/US1999/007021 WO1999056442A2 (en) 1998-04-28 1999-04-27 Transmitter/receiver for gmsk and offset-qam

Country Status (11)

Country Link
US (2) US6185259B1 (en)
EP (2) EP1333634B1 (en)
JP (1) JP2002513247A (en)
KR (1) KR20010043092A (en)
CN (1) CN1309858A (en)
AU (1) AU755079B2 (en)
BR (1) BR9910013A (en)
EE (1) EE200000622A (en)
HK (1) HK1039424A1 (en)
MY (1) MY120073A (en)
WO (1) WO1999056442A2 (en)

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