CA2382052A1 - A single sideband spread spectrum generator using hilbert transform - Google Patents
A single sideband spread spectrum generator using hilbert transform Download PDFInfo
- Publication number
- CA2382052A1 CA2382052A1 CA002382052A CA2382052A CA2382052A1 CA 2382052 A1 CA2382052 A1 CA 2382052A1 CA 002382052 A CA002382052 A CA 002382052A CA 2382052 A CA2382052 A CA 2382052A CA 2382052 A1 CA2382052 A1 CA 2382052A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- complex
- complex spreading
- phase
- spreading signal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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Classifications
-
- 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
- H04B1/68—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 for wholly or partially suppressing the carrier or one side band
-
- 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
Abstract
This invention relates to a signal generator and decoder for a single sideband spread spectrum signal.
The present invention provides a single sideband spread spectrum signal generator and decoder in which single sideband modulation using a complex spreading code is achieved with improved correlation properties, so that the interference between users is reduced.
The present invention provides a single sideband spread spectrum signal generator and decoder in which single sideband modulation using a complex spreading code is achieved with improved correlation properties, so that the interference between users is reduced.
Claims (13)
1. A method of generating a single sideband spread spectrum signal comprising the steps of:
phase-shifting a complex spreading singal in accordance with a Hilbert transform to produce a phase-shifted complex spreading sigal;
upconverting the complex spreading signal and the phase-shifted complex spreading signal to a higher frequency to produce the single sideband spread spectrum signal, bandlimiting one of at least the complex spreading signal or the single sideband spread spectrum signal; and modulating one of the complex spreading signal or the single sideband spread spectrum signal with a received signal, wherein the order in which the steps are performed is immaterial provided that the phase shifting step is performed before the upconversion step.
phase-shifting a complex spreading singal in accordance with a Hilbert transform to produce a phase-shifted complex spreading sigal;
upconverting the complex spreading signal and the phase-shifted complex spreading signal to a higher frequency to produce the single sideband spread spectrum signal, bandlimiting one of at least the complex spreading signal or the single sideband spread spectrum signal; and modulating one of the complex spreading signal or the single sideband spread spectrum signal with a received signal, wherein the order in which the steps are performed is immaterial provided that the phase shifting step is performed before the upconversion step.
2. A method according to claim 1, in which the upconverting step comprises the substeps of modulating a signal of the upconverted complex signal in accordance with the real part of the complex signal combined with the imaginary part of the phase shifted complex signal; and modulating a quadrature signal of the upconverted complex signal in accordance with the imaginary part of the complex signal combined with the real part of the phase shifted complex signal.
3. A method according to claim 1 or claim 2, in which the complex spreading signal is derived from a sequence defined by the equation where m = 0,1,2,..., N-1, q is any integer and the number of sequences of a given length is N.
4. A method according to any one of the preceding claims in which the bandlimiting step is performed prior to the phase shifting step.
5. A method according to any one of claims 1 to 3 in which the bandlimiting step is performed after the upconversion step.
6. A method according to any one of the preceding claims in which the modulation step is performed after the upconversion step.
7. An apparatus for transmitting a single sideband spread spectrum signal, comprising: a complex spreading signal generator (1) for generating a complex spreading signal:
a phase shifter (3) coupled to receive the complex spreading signal via the complex spreading signal generator and for phase-shifting the complex spreading signal in accordance with a Hilbert Transform to provide a phase-shifted complex-spreading signal;
a complex modulator (6) coupled to receive the complex spreading signal and the phase-shifted complex spreading signal for upconversion thereof to produce the single sideband spread spectrum signal;
a bandlimiting filter (2;2',2";8) for bandlimiting one of at least the complex spreading signal or the single sideband spread spectrum signal; and a data modulator (4,5;9) connected to receive an input signal for modulating one of the complex spreading signal or the single sideband spread spectrum with the input signal.
a phase shifter (3) coupled to receive the complex spreading signal via the complex spreading signal generator and for phase-shifting the complex spreading signal in accordance with a Hilbert Transform to provide a phase-shifted complex-spreading signal;
a complex modulator (6) coupled to receive the complex spreading signal and the phase-shifted complex spreading signal for upconversion thereof to produce the single sideband spread spectrum signal;
a bandlimiting filter (2;2',2";8) for bandlimiting one of at least the complex spreading signal or the single sideband spread spectrum signal; and a data modulator (4,5;9) connected to receive an input signal for modulating one of the complex spreading signal or the single sideband spread spectrum with the input signal.
8. An apparatus according to claim 7, in which the bandlimiting filter is a low pass filter connected to receive the output of the complex spreading signal generator.
9. An apparatus according to claim 7, in which the bandlimiting filter is a band pass filter connected to receive the output of the complex modulator.
10. An apparatus according to any one of claims 7 to 9, in which the data modulator is coupled to receive a second signal via the complex modulator.
11. A method of decoding a single sideband signal comprising the steps of upconverting the complex spreading signal to a higher frequency; and demodulating a received signal in accordance with the upconverted complex spreading signal.
12. A method according to claim 11, in which the complex spreading signal is derived from a sequence defined by the equation a m = W~/2+qm N even = W~/2+qm N odd where W N = e-i2.pi.r/N
m = 0,1,2,..., N-1, q is any integer and the number of sequences of a given length being N.
m = 0,1,2,..., N-1, q is any integer and the number of sequences of a given length being N.
13. An apparatus for decoding a transmitted signal, comprising:
a complex spreading signal generator;
a phase shifter connected to receive the complex spreading signal from the complex spreading signal generator;
a complex modulator connected to receive the complex spreading signal from the complex spreading signal generator, connected to receive the phase shifted complex spreading signal from the phase shifter and arranged in operation to upconvert the complex spreading signal; and a data modulator connected to receive the transmitted signal and the upconverted complex spreading signal and arranged in operation to demodulate the transmitted signal to provide a decoded transmitted signal.
a complex spreading signal generator;
a phase shifter connected to receive the complex spreading signal from the complex spreading signal generator;
a complex modulator connected to receive the complex spreading signal from the complex spreading signal generator, connected to receive the phase shifted complex spreading signal from the phase shifter and arranged in operation to upconvert the complex spreading signal; and a data modulator connected to receive the transmitted signal and the upconverted complex spreading signal and arranged in operation to demodulate the transmitted signal to provide a decoded transmitted signal.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99306490A EP1077532A1 (en) | 1999-08-17 | 1999-08-17 | Spread Spectrum Signal Generator and Decoder for Single Sideband Transmission |
EP99306490.6 | 1999-08-17 | ||
PCT/GB2000/002997 WO2001013531A1 (en) | 1999-08-17 | 2000-08-03 | Signal generator and decoder |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2382052A1 true CA2382052A1 (en) | 2001-02-22 |
CA2382052C CA2382052C (en) | 2010-10-19 |
Family
ID=8241583
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2382052A Expired - Fee Related CA2382052C (en) | 1999-08-17 | 2000-08-03 | A single sideband spread spectrum generator using hilbert transform |
Country Status (9)
Country | Link |
---|---|
US (1) | US7372891B1 (en) |
EP (2) | EP1077532A1 (en) |
JP (1) | JP4463458B2 (en) |
CN (1) | CN1165114C (en) |
AT (1) | ATE277459T1 (en) |
AU (1) | AU6305700A (en) |
CA (1) | CA2382052C (en) |
DE (1) | DE60014113T2 (en) |
WO (1) | WO2001013531A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108199996A (en) * | 2017-11-21 | 2018-06-22 | 上海微波技术研究所(中国电子科技集团公司第五十研究所) | Independent sideband modulation signal demodulating method based on FPGA |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6961691B1 (en) | 2000-03-30 | 2005-11-01 | Mentor Graphics Corporation | Non-synchronized multiplex data transport across synchronous systems |
JP3643366B2 (en) * | 2003-07-10 | 2005-04-27 | 松下電器産業株式会社 | CDMA transmitter and CDMA receiver |
CN100410925C (en) * | 2004-12-30 | 2008-08-13 | 中国科学院长春光学精密机械与物理研究所 | Digital signal processing method for ultrasonic signals |
EP3142314A3 (en) | 2005-11-28 | 2017-08-02 | Evolved Wireless LLC | Method and receiving end for analyzing a code sequence in a wireless communication system |
US8005153B2 (en) | 2006-01-25 | 2011-08-23 | Texas Instruments Incorporated | Method and apparatus for increasing the number of orthogonal signals using block spreading |
US8369860B2 (en) * | 2006-08-18 | 2013-02-05 | Interdigital Technology Corporation | Sending and reducing uplink feedback signaling for transmission of MBMS data |
JP2008085921A (en) * | 2006-09-28 | 2008-04-10 | Matsushita Electric Ind Co Ltd | Radio transmission apparatus and radio receiving apparatus |
JP4734419B2 (en) * | 2006-09-29 | 2011-07-27 | パナソニック株式会社 | Terminal apparatus and random access preamble transmission method |
JP4786583B2 (en) * | 2007-04-04 | 2011-10-05 | パナソニック株式会社 | SSB signal forming method and wireless transmission apparatus |
CN101257319B (en) * | 2008-04-09 | 2011-07-20 | 浙江大学 | Complete digital logarithm automatic gain control device and method |
JP5131550B2 (en) * | 2008-07-23 | 2013-01-30 | 株式会社カオスウェア | Spreading code calculation device, communication system, transmission device, reception device, and program |
CN111585928B (en) * | 2020-04-28 | 2023-05-05 | 中国电子科技集团公司第三研究所 | Single sideband modulation and demodulation method and device for voice signal |
Family Cites Families (16)
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US4726069A (en) * | 1984-05-18 | 1988-02-16 | Stevenson Carl R | A muiti-mode modulation and demodulation system and method |
US5434577A (en) * | 1989-11-17 | 1995-07-18 | Baghdady; Elie J. | Signal modulation methods and apparatus |
US5459758A (en) * | 1993-11-02 | 1995-10-17 | Interdigital Technology Corporation | Noise shaping technique for spread spectrum communications |
US5422909A (en) * | 1993-11-30 | 1995-06-06 | Motorola, Inc. | Method and apparatus for multi-phase component downconversion |
US5619503A (en) * | 1994-01-11 | 1997-04-08 | Ericsson Inc. | Cellular/satellite communications system with improved frequency re-use |
KR100326312B1 (en) * | 1994-06-17 | 2002-06-22 | 윤종용 | Synchronous transceiver of spread spectrum communication manner |
CA2302289C (en) * | 1996-08-29 | 2005-11-08 | Gregory G. Raleigh | Spatio-temporal processing for communication |
CA2197624C (en) * | 1997-02-14 | 2003-07-29 | Robert J. Davies | Hybrid single sideband optical modulator |
US6005894A (en) * | 1997-04-04 | 1999-12-21 | Kumar; Derek D. | AM-compatible digital broadcasting method and system |
US5937006A (en) * | 1997-05-28 | 1999-08-10 | The Aerospace Corporation | Frequency translating device transmission response method |
KR100365346B1 (en) * | 1997-09-09 | 2003-04-11 | 삼성전자 주식회사 | Apparatus and method for generating quasi-orthogonal code of mobile communication system and diffusing band by using quasi-orthogonal code |
US6389000B1 (en) * | 1997-09-16 | 2002-05-14 | Qualcomm Incorporated | Method and apparatus for transmitting and receiving high speed data in a CDMA communication system using multiple carriers |
US6288610B1 (en) * | 1998-03-19 | 2001-09-11 | Fujitsu Limited | Method and apparatus for correcting signals, apparatus for compensating for distortion, apparatus for preparing distortion compensating data, and transmitter |
CA2311788C (en) * | 1998-09-29 | 2003-12-16 | Samsung Electronics Co., Ltd. | Device and method for generating spreading code and spreading channel signals using spreading code in cdma communication system |
US6430213B1 (en) * | 1999-05-26 | 2002-08-06 | The Aerospace Corporation | Coherent adaptive subcarrier modulation method |
US6798843B1 (en) * | 1999-07-13 | 2004-09-28 | Pmc-Sierra, Inc. | Wideband digital predistortion linearizer for nonlinear amplifiers |
-
1999
- 1999-08-17 EP EP99306490A patent/EP1077532A1/en not_active Withdrawn
-
2000
- 2000-08-03 JP JP2001517715A patent/JP4463458B2/en not_active Expired - Lifetime
- 2000-08-03 WO PCT/GB2000/002997 patent/WO2001013531A1/en active IP Right Grant
- 2000-08-03 CN CNB008111855A patent/CN1165114C/en not_active Expired - Lifetime
- 2000-08-03 AU AU63057/00A patent/AU6305700A/en not_active Abandoned
- 2000-08-03 AT AT00949789T patent/ATE277459T1/en not_active IP Right Cessation
- 2000-08-03 US US10/031,231 patent/US7372891B1/en not_active Expired - Lifetime
- 2000-08-03 EP EP00949789A patent/EP1205036B1/en not_active Expired - Lifetime
- 2000-08-03 CA CA2382052A patent/CA2382052C/en not_active Expired - Fee Related
- 2000-08-03 DE DE60014113T patent/DE60014113T2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108199996A (en) * | 2017-11-21 | 2018-06-22 | 上海微波技术研究所(中国电子科技集团公司第五十研究所) | Independent sideband modulation signal demodulating method based on FPGA |
CN108199996B (en) * | 2017-11-21 | 2020-07-14 | 上海微波技术研究所(中国电子科技集团公司第五十研究所) | FPGA-based independent sideband modulation signal demodulation method |
Also Published As
Publication number | Publication date |
---|---|
EP1205036A1 (en) | 2002-05-15 |
CA2382052C (en) | 2010-10-19 |
DE60014113T2 (en) | 2006-02-23 |
AU6305700A (en) | 2001-03-13 |
JP4463458B2 (en) | 2010-05-19 |
CN1165114C (en) | 2004-09-01 |
EP1077532A1 (en) | 2001-02-21 |
DE60014113D1 (en) | 2004-10-28 |
EP1205036B1 (en) | 2004-09-22 |
US7372891B1 (en) | 2008-05-13 |
JP2003507924A (en) | 2003-02-25 |
CN1367955A (en) | 2002-09-04 |
ATE277459T1 (en) | 2004-10-15 |
WO2001013531A1 (en) | 2001-02-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |