CA2687236A1 - Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in cdma communications - Google Patents
Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in cdma communications Download PDFInfo
- Publication number
- CA2687236A1 CA2687236A1 CA002687236A CA2687236A CA2687236A1 CA 2687236 A1 CA2687236 A1 CA 2687236A1 CA 002687236 A CA002687236 A CA 002687236A CA 2687236 A CA2687236 A CA 2687236A CA 2687236 A1 CA2687236 A1 CA 2687236A1
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- CA
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- Prior art keywords
- signal
- contiguous
- produce
- weighting
- spectrum
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
-
- 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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/7097—Direct sequence modulation interference
- H04B2201/709709—Methods of preventing interference
Abstract
The technology in this application solves these problems (and others) and meets the desirable goals identified above (and others). The technology spreads a signal over an available discontinuous spectrum, such as a radio frequency band, so that the spread signal only occupies the non-contiguous spectrum. In this way, CDMA transmission and reception can be used in a fragmented or non-contiguous spectrum that otherwise would not be useable for direct sequence spreading. Spreading over non-contiguous portions of spectrum is preferably performed without producing unacceptable interference in portions of unavailable spectrum located between the allowed spectrum. By avoiding unacceptable interference in portions of unavailable spectrum located between the allowed spectrum, the unavailable spectrum may be used by other users or services.
Claims (35)
1. A method of communicating information using code division multiple access signals that occupy predetermined, non-contiguous regions of the electromagnetic spectrum, the method characterized by the following steps:
generating a non-contiguous spectrum having non-zero components in permitted regions of the electromagnetic spectrum and zero components in non-permitted regions of the electromagnetic spectrum;
producing a non-contiguous spectrum spreading signal associated with the non-contiguous spectrum;
processing the information into a stream of data symbols;
combining the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal;
modulating the data modulated signal on to a carrier signal having a desired center frequency to produce a signal for transmission; and transmitting the transmission signal.
generating a non-contiguous spectrum having non-zero components in permitted regions of the electromagnetic spectrum and zero components in non-permitted regions of the electromagnetic spectrum;
producing a non-contiguous spectrum spreading signal associated with the non-contiguous spectrum;
processing the information into a stream of data symbols;
combining the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal;
modulating the data modulated signal on to a carrier signal having a desired center frequency to produce a signal for transmission; and transmitting the transmission signal.
2. The communications method of claim 1, wherein the step of producing a non-contiguous spectrum spreading signal comprises performing a Discrete Fourier Transformation on the non-contiguous spectrum to produce a sequence of time waveform samples.
3. The communications system of claim 2, wherein the step of combining the non-contiguous spectrum spreading signal and a data symbol from the stream to produce the data modulated signal comprises multiplying the data symbol value with each sample of the sequence of time waveform samples.
4. The method of claim 3, further comprising:
repeating a block of signal samples corresponding to the non-contiguous spectrum spreading signal, and weighting successive samples from the repeated blocks using a shaping function to produce a shaped, non-contiguous spectrum spreading signal used in the combining.
repeating a block of signal samples corresponding to the non-contiguous spectrum spreading signal, and weighting successive samples from the repeated blocks using a shaping function to produce a shaped, non-contiguous spectrum spreading signal used in the combining.
5. The method in claim 4, further comprising:
storing in memory samples of the resulting shaped non-contiguous spectrum spreading signal.
storing in memory samples of the resulting shaped non-contiguous spectrum spreading signal.
6. The method in claim 1, wherein the step of producing a non-contiguous spectrum spreading signal comprises allocating a complex number to represent an amplitude and phase of each non-zero component of the non-contiguous spectrum and a zero value to represent the zero spectral components.
7. The method in claim 6, wherein the step of combining the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal comprises:
multiplying the data symbol value with each of the complex numbers to generate a set of products, and performing a Discrete Fourier Transform on the set of products to produce the data modulated signal.
multiplying the data symbol value with each of the complex numbers to generate a set of products, and performing a Discrete Fourier Transform on the set of products to produce the data modulated signal.
8. The method in claim 1, further comprising:
repeating a block of signal samples corresponding to the data modulated signal, and weighting successive samples from the repeated blocks using a shaping function to produce a shaped data modulated signal.
repeating a block of signal samples corresponding to the data modulated signal, and weighting successive samples from the repeated blocks using a shaping function to produce a shaped data modulated signal.
9. The method in claim 8, further comprising:
overlapping data modulated signals produced by successive data symbols from the stream to produce a transmission signal.
overlapping data modulated signals produced by successive data symbols from the stream to produce a transmission signal.
10. The method in claim 1, wherein the generating includes:
selecting a sequence from a set of orthogonal sequences, and using the sequence to generate the non-contiguous spectrum and to determine a phase of successive non-zero spectral components.
selecting a sequence from a set of orthogonal sequences, and using the sequence to generate the non-contiguous spectrum and to determine a phase of successive non-zero spectral components.
11. The method according to claim 10, comprising:
producing a first data modulated signal using a first code from the set of orthogonal codes;
producing at least a second data modulated signal using a second code from the set of orthogonal codes;
combining the first and at least the second data modulated signals to produce a composite modulating signal; and using the composite modulating signal in the modulating step.
producing a first data modulated signal using a first code from the set of orthogonal codes;
producing at least a second data modulated signal using a second code from the set of orthogonal codes;
combining the first and at least the second data modulated signals to produce a composite modulating signal; and using the composite modulating signal in the modulating step.
12. Apparatus for use in a transmitter (Fig. 6)for communicating information using code division multiple access signals that occupy predetermined, non-contiguous regions of the electromagnetic spectrum, characterized by electronic circuitry configured to:
generate (110, 100) a non-contiguous spectrum having non-zero components in permitted regions of the electromagnetic spectrum and zero components in non-permitted regions of the electromagnetic spectrum;
produce (100) a non-contiguous spectrum spreading signal associated with the non-contiguous spectrum;
process (110) the information into a stream of data symbols;
combine (120) the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal; and modulate (150) the data modulated signal on to a carrier signal having a desired center frequency to produce a signal for transmission.
generate (110, 100) a non-contiguous spectrum having non-zero components in permitted regions of the electromagnetic spectrum and zero components in non-permitted regions of the electromagnetic spectrum;
produce (100) a non-contiguous spectrum spreading signal associated with the non-contiguous spectrum;
process (110) the information into a stream of data symbols;
combine (120) the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal; and modulate (150) the data modulated signal on to a carrier signal having a desired center frequency to produce a signal for transmission.
13. The apparatus in claim 12. wherein the electronic circuitry is configured to produce a non-contiguous spectrum spreading signal by performing a Discrete Fourier Transformation on the non-contiguous spectrum to produce a sequence of time waveform samples.
14. The apparatus in claim 13, wherein the electronic circuitry is configured to combine the non-contiguous spectrum spreading signal and a data symbol from the stream to produce the data modulated signal by multiplying the data symbol value with each sample of the sequence of time waveform samples.
15. The apparatus in claim 14, wherein the electronic circuitry is configured to:
repeat a block of signal samples corresponding to the non-contiguous spectrum spreading signal, and weight successive samples from the repeated blocks using a shaping function to produce a shaped, non-contiguous spectrum spreading signal used in the combining.
repeat a block of signal samples corresponding to the non-contiguous spectrum spreading signal, and weight successive samples from the repeated blocks using a shaping function to produce a shaped, non-contiguous spectrum spreading signal used in the combining.
16. The apparatus in claim 15, further comprising a memory (100), wherein the electronic circuitry is configured to store in the memory samples of the resulting shaped non-contiguous spectrum spreading signal.
17. The apparatus in claim 12, wherein the electronic circuitry is configured to produce a non-contiguous spectrum spreading signal by allocating a complex number to represent an amplitude and phase of each non-zero component of the non-contiguous spectrum and a zero value to represent the zero spectral components.
18. The apparatus in claim 17, wherein the electronic circuitry is configured to combine the non-contiguous spectrum spreading signal and a data symbol from the stream to produce a data modulated signal by:
multiplying the data symbol value with each of the complex numbers to generate a set of products, and performing a Discrete Fourier Transform on the set of products to produce the data modulated signal.
multiplying the data symbol value with each of the complex numbers to generate a set of products, and performing a Discrete Fourier Transform on the set of products to produce the data modulated signal.
19. The apparatus in claim 12, wherein the electronic circuitry is configured to:
repeat a block of signal samples corresponding to the data modulated signal, and weight successive samples from the repeated blocks using a shaping function to produce a shaped data modulated signal.
repeat a block of signal samples corresponding to the data modulated signal, and weight successive samples from the repeated blocks using a shaping function to produce a shaped data modulated signal.
20. The apparatus in claim 19, wherein the electronic circuitry is configured to:
overlap data modulated signals produced by successive data symbols from the stream to produce a transmission signal.
overlap data modulated signals produced by successive data symbols from the stream to produce a transmission signal.
21. The apparatus in claim 12, wherein the electronic circuitry is configured to:
select a sequence from a set of orthogonal sequences, and use the sequence to generate the non-contiguous spectrum and to determine a phase of successive non-zero spectral components.
select a sequence from a set of orthogonal sequences, and use the sequence to generate the non-contiguous spectrum and to determine a phase of successive non-zero spectral components.
22. The apparatus in claim 21, wherein the electronic circuitry is configured to:
produce a first data modulated signal using a first code from the set of orthogonal codes;
produce at least a second data modulated signal using a second code from the set of orthogonal codes;
combine the first and at least the second data modulated signals to produce a composite modulating signal: and use the composite modulating signal.
produce a first data modulated signal using a first code from the set of orthogonal codes;
produce at least a second data modulated signal using a second code from the set of orthogonal codes;
combine the first and at least the second data modulated signals to produce a composite modulating signal: and use the composite modulating signal.
23. A method for use in a receiver for communicating information using code division multiple access signals that occupy predetermined non-contiguous regions of the electromagnetic spectrum, the method characterized by:
receiving a signal waveform in the time domain containing a non-contiguous spectrum signal;
transforming the one or more components of the time domain signal waveform components to produce contiguous spectral components;
selecting from the contiguous spectral components those components corresponding to the predetermined non-contiguous regions to obtain non-contiguous spectral components;
processing the non-contiguous spectral components to produce one or more received symbol values; and decoding received symbol values to reproduce the information.
receiving a signal waveform in the time domain containing a non-contiguous spectrum signal;
transforming the one or more components of the time domain signal waveform components to produce contiguous spectral components;
selecting from the contiguous spectral components those components corresponding to the predetermined non-contiguous regions to obtain non-contiguous spectral components;
processing the non-contiguous spectral components to produce one or more received symbol values; and decoding received symbol values to reproduce the information.
24. The method in claim 23, wherein the received signal includes repeated, shaped signal blocks modulated with a data symbol, the method further comprising:
using a matched filter to weight each signal block with a corresponding shaping function, adding corresponding samples of the weighted blocks to generate a matched filtered block corresponding to the non-contiguous spectrum waveform time samples, and transforming the matched filtered block to produce the contiguous spectral components.
using a matched filter to weight each signal block with a corresponding shaping function, adding corresponding samples of the weighted blocks to generate a matched filtered block corresponding to the non-contiguous spectrum waveform time samples, and transforming the matched filtered block to produce the contiguous spectral components.
25. The method in claim 24, wherein the processing includes weighting and combining the non-contiguous spectral components to produce one or more received symbol values.
26. The method in claim 25, wherein the weighting and combining includes weighting the non-contiguous spectral components using a complex conjugate of a weighting applied at a transmitter that transmits the information.
27. The method of claim 26, wherein the weighting applied at the transmitter is a vector of weighting values selected from a set of orthogonal codes.
the method further comprising:
performing a first weighting and combining using the complex conjugate of a first vector of weighting values to produce a first data symbol value, and performing a second weighting and combining using the complex conjugate of a second vector of weighting values to produce a second data symbol value.
the method further comprising:
performing a first weighting and combining using the complex conjugate of a first vector of weighting values to produce a first data symbol value, and performing a second weighting and combining using the complex conjugate of a second vector of weighting values to produce a second data symbol value.
28. The method in claim 27, wherein the weighting further comprises weighting non-contiguous spectral samples using an estimate of phase changes of each sample induced by a propagation path from the transmitter to the receiver.
29. The method in claim 28, wherein the weighting permits information decoding when the propagation path includes interference from the same transmitter and interference from a different transmitter.
30. Apparatus (Fig. 7) for use in a receiver for communicating information using code division multiple access signals that occupy predetermined non-contiguous regions of the electromagnetic spectrum, comprising electronic circuitry characterized by being configured to:
receive a signal waveform in the time domain containing a non-contiguous spectrum signal;
transform (210) the one or more components of the time domain signal waveform components to produce contiguous spectral components;
select from the contiguous spectral components those components corresponding to the predetermined non-contiguous regions to obtain non-contiguous spectral components;
process (200) the non-contiguous spectral components to produce one or more received symbol values; and decode received symbol values to reproduce the information.
receive a signal waveform in the time domain containing a non-contiguous spectrum signal;
transform (210) the one or more components of the time domain signal waveform components to produce contiguous spectral components;
select from the contiguous spectral components those components corresponding to the predetermined non-contiguous regions to obtain non-contiguous spectral components;
process (200) the non-contiguous spectral components to produce one or more received symbol values; and decode received symbol values to reproduce the information.
31. The apparatus in claim 30, wherein the received signal includes repeated. shaped signal blocks modulated with a data symbol, and wherein the electronic circuitry is configured to:
use a matched filter to weight each signal block with a corresponding shaping function, add corresponding samples of the weighted blocks to generate a matched filtered block corresponding to the non-contiguous spectrum waveform time samples, and transform the matched filtered block to produce the contiguous spectral components.
use a matched filter to weight each signal block with a corresponding shaping function, add corresponding samples of the weighted blocks to generate a matched filtered block corresponding to the non-contiguous spectrum waveform time samples, and transform the matched filtered block to produce the contiguous spectral components.
32. The apparatus in claim 31, wherein the processing includes weighting and combining (200) the non-contiguous spectral components to produce one or more received symbol values.
33. The apparatus in claim 32, wherein the weighting and combining includes weighting the non-contiguous spectral components using a complex conjugate of a weighting applied at a transmitter that transmits the information.
34. The apparatus in claim 33, wherein the weighting applied at the transmitter is a vector of weighting values selected from a set of orthogonal codes, the electronic circuitry being further configured to:
perform a first weighting and combining using the complex conjugate of a first vector of weighting values to produce a first data symbol value, and perform a second weighting and combining using the complex conjugate of a second vector of weighting values to produce a second data symbol value.
perform a first weighting and combining using the complex conjugate of a first vector of weighting values to produce a first data symbol value, and perform a second weighting and combining using the complex conjugate of a second vector of weighting values to produce a second data symbol value.
35. The apparatus in claim 34, wherein the weighting further comprises weighting non-contiguous spectral samples using an estimate of phase changes of each sample induced by a propagation path from the transmitter to the receiver.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US94012907P | 2007-05-25 | 2007-05-25 | |
| US60/940,129 | 2007-05-25 | ||
| US11/929,268 | 2007-10-30 | ||
| US11/929,268 US7864663B2 (en) | 2007-05-25 | 2007-10-30 | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in CDMA communications |
| PCT/SE2008/050152 WO2008147298A2 (en) | 2007-05-25 | 2008-02-07 | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in cdma communications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2687236A1 true CA2687236A1 (en) | 2008-12-04 |
Family
ID=40072283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002687236A Abandoned CA2687236A1 (en) | 2007-05-25 | 2008-02-07 | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in cdma communications |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US7864663B2 (en) |
| EP (1) | EP2151066B1 (en) |
| CN (1) | CN101682360B (en) |
| CA (1) | CA2687236A1 (en) |
| MX (1) | MX2009011141A (en) |
| WO (1) | WO2008147298A2 (en) |
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| DE60205128T2 (en) * | 2001-10-19 | 2006-05-24 | Matsushita Electric Industrial Co., Ltd., Kadoma | DEVICE AND METHOD FOR SPREADING SPECTRUM TRANSMISSION |
| US10985811B2 (en) | 2004-04-02 | 2021-04-20 | Rearden, Llc | System and method for distributed antenna wireless communications |
| US11394436B2 (en) | 2004-04-02 | 2022-07-19 | Rearden, Llc | System and method for distributed antenna wireless communications |
| US11451275B2 (en) | 2004-04-02 | 2022-09-20 | Rearden, Llc | System and method for distributed antenna wireless communications |
| US8116371B2 (en) * | 2006-03-08 | 2012-02-14 | Texas Instruments Incorporated | VLC technique for layered video coding using distinct element grouping |
| US7864663B2 (en) * | 2007-05-25 | 2011-01-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in CDMA communications |
| CN101447961A (en) * | 2007-11-26 | 2009-06-03 | 大唐移动通信设备有限公司 | Method, system and device for signal generation and information transmission in broadband wireless communication |
| EP2420002A4 (en) * | 2009-04-17 | 2015-01-07 | Raytheon Co | Communication system incorporating physical layer waveform structure |
| US8351534B2 (en) * | 2009-04-17 | 2013-01-08 | Raytheon Company | Distributed maximal ratio combining receiver architecture |
| KR101620071B1 (en) * | 2009-09-16 | 2016-05-12 | 삼성전자주식회사 | Apparatus and method for setting frequency band, access point and method for setting frequency band |
| US8274995B2 (en) * | 2010-05-17 | 2012-09-25 | Telefonaktiebolaget L M Ericsson (Publ) | Cyclic prefix for non-contiguous signal transmission |
| US8837652B2 (en) | 2010-12-31 | 2014-09-16 | Raytheon Company | Receiver synchronization in radio communication systems employing transmit diversity |
| EP2675072A1 (en) * | 2012-06-15 | 2013-12-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for spreading a plurality of data symbols onto subcarriers of a carrier signal |
| US11190947B2 (en) | 2014-04-16 | 2021-11-30 | Rearden, Llc | Systems and methods for concurrent spectrum usage within actively used spectrum |
| US11189917B2 (en) * | 2014-04-16 | 2021-11-30 | Rearden, Llc | Systems and methods for distributing radioheads |
| US10194346B2 (en) | 2012-11-26 | 2019-01-29 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
| US9692550B2 (en) | 2012-11-29 | 2017-06-27 | Huawei Technologies Co., Ltd. | Systems and methods for waveform selection and adaptation |
| US10164698B2 (en) | 2013-03-12 | 2018-12-25 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
| RU2767777C2 (en) | 2013-03-15 | 2022-03-21 | Риарден, Ллк | Systems and methods of radio frequency calibration using the principle of reciprocity of channels in wireless communication with distributed input - distributed output |
| US11290162B2 (en) | 2014-04-16 | 2022-03-29 | Rearden, Llc | Systems and methods for mitigating interference within actively used spectrum |
| US9397723B2 (en) * | 2014-08-26 | 2016-07-19 | Microsoft Technology Licensing, Llc | Spread spectrum wireless over non-contiguous channels |
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| KR101779584B1 (en) * | 2016-04-29 | 2017-09-18 | 경희대학교 산학협력단 | Method for recovering original signal in direct sequence code division multiple access based on complexity reduction |
| US9787553B1 (en) * | 2016-12-09 | 2017-10-10 | Nokia Solutions And Networks Oy | Partial channel filtering |
| CN117176539A (en) * | 2018-01-26 | 2023-12-05 | 加州理工学院 | System and method for communicating by modulating data at zero |
| CN113534073B (en) * | 2021-06-23 | 2023-08-15 | 北京遥感设备研究所 | Landing measurement radar echo simulator and method based on board card architecture of machine box |
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| US7864663B2 (en) * | 2007-05-25 | 2011-01-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Orthogonal spread-spectrum waveform generation with non-contiguous spectral occupancy for use in CDMA communications |
-
2007
- 2007-10-30 US US11/929,268 patent/US7864663B2/en active Active
-
2008
- 2008-02-07 WO PCT/SE2008/050152 patent/WO2008147298A2/en active Application Filing
- 2008-02-07 CN CN2008800172496A patent/CN101682360B/en not_active Expired - Fee Related
- 2008-02-07 MX MX2009011141A patent/MX2009011141A/en active IP Right Grant
- 2008-02-07 EP EP08705388.0A patent/EP2151066B1/en active Active
- 2008-02-07 CA CA002687236A patent/CA2687236A1/en not_active Abandoned
-
2010
- 2010-12-13 US US12/966,594 patent/US20110080936A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US7864663B2 (en) | 2011-01-04 |
| WO2008147298A3 (en) | 2009-01-22 |
| EP2151066A2 (en) | 2010-02-10 |
| WO2008147298A2 (en) | 2008-12-04 |
| US20080291821A1 (en) | 2008-11-27 |
| MX2009011141A (en) | 2009-10-30 |
| US20110080936A1 (en) | 2011-04-07 |
| CN101682360B (en) | 2013-03-27 |
| EP2151066A4 (en) | 2014-11-05 |
| CN101682360A (en) | 2010-03-24 |
| EP2151066B1 (en) | 2020-12-16 |
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