CA2382052A1 - A single sideband spread spectrum generator using hilbert transform - Google Patents

A single sideband spread spectrum generator using hilbert transform Download PDF

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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
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Canada
Prior art keywords
signal
complex
complex spreading
phase
spreading signal
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Granted
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CA002382052A
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French (fr)
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CA2382052C (en
Inventor
Terence Widdowson
Jonathan Guy Owen Moss
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British Telecommunications PLC
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Individual
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Publication of CA2382052A1 publication Critical patent/CA2382052A1/en
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Publication of CA2382052C publication Critical patent/CA2382052C/en
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Expired - Fee Related legal-status Critical Current

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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.

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.
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.
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.
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.
CA2382052A 1999-08-17 2000-08-03 A single sideband spread spectrum generator using hilbert transform Expired - Fee Related CA2382052C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99306490.6 1999-08-17
EP99306490A EP1077532A1 (en) 1999-08-17 1999-08-17 Spread Spectrum Signal Generator and Decoder for Single Sideband Transmission
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

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Family Applications (1)

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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)

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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

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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
EP1985023A4 (en) 2006-01-25 2014-08-13 Texas Instruments Inc 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
WO2008038790A1 (en) * 2006-09-29 2008-04-03 Panasonic Corporation Sequence allocating method and sequence allocating apparatus
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

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US5422909A (en) * 1993-11-30 1995-06-06 Motorola, Inc. Method and apparatus for multi-phase component downconversion
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* Cited by examiner, † Cited by third party
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
ATE277459T1 (en) 2004-10-15
WO2001013531A1 (en) 2001-02-22
AU6305700A (en) 2001-03-13
CN1367955A (en) 2002-09-04
EP1077532A1 (en) 2001-02-21
JP2003507924A (en) 2003-02-25
EP1205036A1 (en) 2002-05-15
JP4463458B2 (en) 2010-05-19
EP1205036B1 (en) 2004-09-22
CA2382052C (en) 2010-10-19
DE60014113T2 (en) 2006-02-23
DE60014113D1 (en) 2004-10-28
US7372891B1 (en) 2008-05-13
CN1165114C (en) 2004-09-01

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