CA2214058A1 - Method and system providing unified dpsk-psk signalling for cdma-based satellite communications - Google Patents

Method and system providing unified dpsk-psk signalling for cdma-based satellite communications

Info

Publication number
CA2214058A1
CA2214058A1 CA002214058A CA2214058A CA2214058A1 CA 2214058 A1 CA2214058 A1 CA 2214058A1 CA 002214058 A CA002214058 A CA 002214058A CA 2214058 A CA2214058 A CA 2214058A CA 2214058 A1 CA2214058 A1 CA 2214058A1
Authority
CA
Canada
Prior art keywords
downlink
sequence
uplink
signal
phase
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
CA002214058A
Other languages
French (fr)
Other versions
CA2214058C (en
Inventor
Jin-Meng Ho
Ramautar Sharma
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.)
AT&T Corp
Original Assignee
AT&T 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 AT&T Corp filed Critical AT&T Corp
Publication of CA2214058A1 publication Critical patent/CA2214058A1/en
Application granted granted Critical
Publication of CA2214058C publication Critical patent/CA2214058C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • 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
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
    • H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
    • H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
    • H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
    • 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
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2332—Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier

Abstract

A method and a system for multi-user communications in a CDMA-based satellite network. An uplink RF signal containing a coded user message that has been differentially phase encoded and spread using a Walsh function and a pseudo-random number (PN) sequence for the uplink, is received by a satellite receiver. The received uplink RF signal is non-coherently quadrature demodulated and then despread using the uplink PN sequence and Walsh function. The differential phase signal carrying the coded user message is regenerated onboard the satellite by phase comparison and switched to a selected downlink transmitter. The quadrature components of the differential phase signal are then respread using a Walsh function and a PN sequence for the downlink, followed by quadrature modulation for transmission to a terrestrial receiver. The received downlink RF signal is coherently quadrature demodulated and despread using the PN sequence and Walsh function for the downlink. The downlink carrier phase originated from the uplinkdifferential phase is regenerated from the despread quadrature baseband components and, hence, the coded user message is detected and decoded.
CA002214058A 1997-03-04 1997-08-21 Method and system providing unified dpsk-psk signalling for cdma-based satellite communications Expired - Fee Related CA2214058C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/808,777 US6072770A (en) 1997-03-04 1997-03-04 Method and system providing unified DPSK-PSK signalling for CDMA-based satellite communications
US808,777 1997-03-04

Publications (2)

Publication Number Publication Date
CA2214058A1 true CA2214058A1 (en) 1998-09-04
CA2214058C CA2214058C (en) 2001-08-07

Family

ID=25199713

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002214058A Expired - Fee Related CA2214058C (en) 1997-03-04 1997-08-21 Method and system providing unified dpsk-psk signalling for cdma-based satellite communications

Country Status (4)

Country Link
US (1) US6072770A (en)
EP (1) EP0863622A3 (en)
JP (2) JP4128255B2 (en)
CA (1) CA2214058C (en)

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JPH073437U (en) * 1993-06-28 1995-01-20 株式会社マルタ商店 Food and drink container with lid
US6072785A (en) * 1997-03-04 2000-06-06 At&T Corp Differential PSK signalling in CDMA networks
EP0896455B1 (en) * 1997-08-08 2006-11-02 Sony Deutschland GmbH Non-coherent 6-port receiver
EP1083694A4 (en) * 1998-05-14 2004-09-29 Masahichi Kishi Code division multiple access (cdma) transmission system
DE69839625D1 (en) * 1998-08-21 2008-07-31 Lucent Technologies Inc Multi-code CDMA system using iterative decoding
US6980531B1 (en) 1998-12-02 2005-12-27 At&T Corp. Multiple access spread spectrum switching methodology
US6574794B1 (en) * 1998-12-18 2003-06-03 Hughes Electronics Corporation System and satellite payload architecture for interactive data distribution services
US20010033621A1 (en) * 2000-02-07 2001-10-25 Khayrallah Ali S. Method of differential coding and modulation
US8363744B2 (en) 2001-06-10 2013-01-29 Aloft Media, Llc Method and system for robust, secure, and high-efficiency voice and packet transmission over ad-hoc, mesh, and MIMO communication networks
EP1199828A3 (en) * 2000-10-20 2003-01-22 TRW Inc. High efficiency signaling with selective coding and interleaving
US7412294B1 (en) 2001-12-21 2008-08-12 Woolfork C Earl Wireless digital audio system
US7369606B1 (en) 2004-02-19 2008-05-06 L-3 Communications Corporation Phase error detector using I/Q interference cancellation
US7453920B2 (en) * 2004-03-09 2008-11-18 Atc Technologies, Llc Code synchronization in CDMA satellite wireless communications system using uplink channel detection
CN100349384C (en) * 2004-05-26 2007-11-14 华为技术有限公司 De-spread spectrum processing method and apparatus for multi-code transmission
US8699465B2 (en) * 2009-11-30 2014-04-15 Qualcomm Incorporated Forward link data rate control and rate indication for satellite-enabled communications systems
US10090910B2 (en) * 2016-12-13 2018-10-02 Intelligent Fusion Technology, Inc. Advanced uplink multiple access scheme for satellite control network
WO2020079679A1 (en) 2018-10-17 2020-04-23 Satixfy Israel Ltd. Satellite data communication system and method
US10797746B2 (en) * 2018-11-16 2020-10-06 Ossia Inc. Coded antenna array

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5023889A (en) * 1988-05-31 1991-06-11 California Institute Of Technology Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels
US5038341A (en) * 1989-12-01 1991-08-06 Hughes Aircraft Company Relay communication system
JP3280141B2 (en) * 1993-04-30 2002-04-30 キヤノン株式会社 Spread spectrum receiver
US5465269A (en) * 1994-02-02 1995-11-07 Motorola, Inc. Method and apparatus for encoding and decoding a supplementary signal
US5515396A (en) * 1994-02-25 1996-05-07 Motorola, Inc. Method and apparatus for selecting a spreading code in a spectrum spread communication system
US5608722A (en) * 1995-04-03 1997-03-04 Qualcomm Incorporated Multi-user communication system architecture with distributed receivers
JPH09238093A (en) * 1996-02-29 1997-09-09 Sanyo Electric Co Ltd Spread spectrum receiver
US5815527A (en) * 1996-04-23 1998-09-29 At & T Corp Method and apparatus for switching spread spectrum/code division multiple access modulated beams

Also Published As

Publication number Publication date
US6072770A (en) 2000-06-06
JPH10294718A (en) 1998-11-04
JP4128255B2 (en) 2008-07-30
JP2008206177A (en) 2008-09-04
EP0863622A2 (en) 1998-09-09
EP0863622A3 (en) 1999-06-16
CA2214058C (en) 2001-08-07
MX9801459A (en) 1998-09-30
JP4213762B2 (en) 2009-01-21

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EEER Examination request
MKLA Lapsed

Effective date: 20170821

MKLA Lapsed

Effective date: 20170821