CA2008754A1 - Spread spectrum signal demodulator - Google Patents

Spread spectrum signal demodulator

Info

Publication number
CA2008754A1
CA2008754A1 CA2008754A CA2008754A CA2008754A1 CA 2008754 A1 CA2008754 A1 CA 2008754A1 CA 2008754 A CA2008754 A CA 2008754A CA 2008754 A CA2008754 A CA 2008754A CA 2008754 A1 CA2008754 A1 CA 2008754A1
Authority
CA
Canada
Prior art keywords
output
spread spectrum
data
produce
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
Application number
CA2008754A
Other languages
French (fr)
Other versions
CA2008754C (en
Inventor
Hans Van Driest
Jacobus C. Haartsen
Bruce T. Tuch
Maarten Visee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCR Voyix Corp
Original Assignee
NCR Corp
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 NCR Corp filed Critical NCR Corp
Publication of CA2008754A1 publication Critical patent/CA2008754A1/en
Application granted granted Critical
Publication of CA2008754C publication Critical patent/CA2008754C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/709—Correlator structure
    • H04B1/7093—Matched filter type
    • 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
    • H04B1/70712—Spread spectrum techniques using direct sequence modulation with demodulation by means of convolvers, e.g. of the SAW type

Abstract

In a digital data receiver (80) for demodulating a direct sequence spread spectrum differential phase shift keyed data signal, the signal is applied to the input transducer (140) of a SAW
device (100) which has first and second output transducers (142, 144) spaced apart on the SAW
substrate (130) so as to produce first and second output signals on output lines (102, 104), which are relatively delayed by a time corresponding to a symbol period. The output transducers are of identical construction and are matched to the spread spectrum code utilized in the data signal. Thus, a single SAW
device (100) effects both correlation and delay. The output signals on the output lines (102, 104) are processed by a circuit including multipliers (106, 110) and a phase shifter (108) to produce output data signals representing the received data.
CA002008754A 1989-07-20 1990-01-29 Spread spectrum signal demodulator Expired - Fee Related CA2008754C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898916623A GB8916623D0 (en) 1989-07-20 1989-07-20 Spread spectrum signal demodulator
GB8916623.5 1989-07-20

Publications (2)

Publication Number Publication Date
CA2008754A1 true CA2008754A1 (en) 1991-01-20
CA2008754C CA2008754C (en) 2000-06-13

Family

ID=10660350

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002008754A Expired - Fee Related CA2008754C (en) 1989-07-20 1990-01-29 Spread spectrum signal demodulator

Country Status (5)

Country Link
US (1) US4998261A (en)
EP (1) EP0409538B1 (en)
CA (1) CA2008754C (en)
DE (1) DE69014744T2 (en)
GB (1) GB8916623D0 (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2648517B2 (en) * 1989-08-21 1997-09-03 マルヤス工業株式会社 Demodulator for spread spectrum communication
CH679718A5 (en) * 1989-10-19 1992-03-31 Ascom Zelcom Ag
US5379456A (en) * 1991-02-05 1995-01-03 Whistler Corporation Multiplying saw phase shift envelope detector
EP0569007A2 (en) * 1992-05-08 1993-11-10 Canon Kabushiki Kaisha Surface acoustic wave device, and demodulating apparatus and communication system using the surface acoustic wave device
FR2696298B1 (en) * 1992-07-15 1994-10-28 Commissariat Energie Atomique Component for receiver or for differential transceiver of spread spectrum signals by direct sequence and corresponding transceiver.
FR2695772A1 (en) * 1992-07-15 1994-03-18 Commissariat Energie Atomique Component for differential signal receiver for spectra spread by direct sequence - includes first correlator having applied signal at entry and pseudo-random sequence with second correlator to retard data
US5434893A (en) * 1992-12-22 1995-07-18 Commissariat Energie Atomique Component for a differential transmitter-receiver of signals with direct sequence spread spectrum and the corresponding transmitter-receiver
FR2707441B1 (en) * 1993-07-06 1995-08-11 Commissariat Energie Atomique Component for receiver or for differential transceiver of spread spectrum signals by direct sequence and corresponding transceiver.
US5353301A (en) * 1993-09-17 1994-10-04 Motorola, Inc. Method and apparatus for combining multipath spread-spectrum signals
US5563610A (en) * 1995-06-08 1996-10-08 Metawave Communications Corporation Narrow beam antenna systems with angular diversity
US6108364A (en) * 1995-08-31 2000-08-22 Qualcomm Incorporated Time division duplex repeater for use in a CDMA system
US6320842B1 (en) * 1996-02-01 2001-11-20 Canon Kabushiki Kaisha Spread spectrum communication apparatus
JP3340635B2 (en) * 1996-11-29 2002-11-05 株式会社日立製作所 Surface acoustic wave signal processor for spread spectrum communication
US6094450A (en) * 1997-06-20 2000-07-25 Cincinnati Electronics Corporation Spread spectrum chip shift keying modulation/demodulation system and method
JPH1117755A (en) * 1997-06-25 1999-01-22 Futaba Corp Phase discrimination circuit
US6064665A (en) * 1997-10-22 2000-05-16 U S West, Inc. System and method for single to two-band personal communication service base station conversion
US6356580B1 (en) 1999-07-06 2002-03-12 The United States Of America As Represented By The Secretary Of The Air Force Direct sequence spread spectrum using non-antipodal phase shift keying
US8213484B2 (en) * 2005-06-16 2012-07-03 Qualcomm Incorporated Wireless communication network with extended coverage range
US8699545B2 (en) * 2010-04-08 2014-04-15 Comtech Ef Data Corp. Embedded meta-carrier with code progression message reassembly

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770949A (en) * 1972-04-21 1973-11-06 Us Navy Acoustic surface wave correlators and convolvers
US3979700A (en) * 1974-08-01 1976-09-07 International Telephone And Telegraph Corporation Video processor
FR2312881A1 (en) * 1975-05-29 1976-12-24 Goff Jeannine Le DIFFERENTIAL DEMODULATORS WITH ELASTIC SURFACE WAVE DEVICES
US4169286A (en) * 1978-06-09 1979-09-25 Communications Satellite Corporation Surface acoustic wave unique word detector and coherent demodulator
FR2553610B1 (en) * 1983-10-12 1986-02-07 Telediffusion Fse MODULATED WAVE RECEPTION CIRCUIT EARLY IN FREQUENCY BY ANALOG SIGNAL AND EARLY IN PHASE BY DIGITAL SIGNAL
KR870004587A (en) * 1985-10-16 1987-05-11 엘리 와이스 Wireless local area network
US4672658A (en) * 1985-10-16 1987-06-09 At&T Company And At&T Bell Laboratories Spread spectrum wireless PBX
US4647863A (en) * 1985-11-01 1987-03-03 The United States Of America As Represented By The Secretary Of The Army Saw transition detector for PSK signals
US4774715A (en) * 1987-03-11 1988-09-27 Telesystems Slw Inc. Device for demodulating a spread spectrum signal

Also Published As

Publication number Publication date
EP0409538A3 (en) 1992-08-12
US4998261A (en) 1991-03-05
CA2008754C (en) 2000-06-13
GB8916623D0 (en) 1989-09-06
DE69014744D1 (en) 1995-01-19
DE69014744T2 (en) 1995-07-27
EP0409538B1 (en) 1994-12-07
EP0409538A2 (en) 1991-01-23

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20050131