CA2214061A1 - Differential psk signalling in cdma networks - Google Patents

Differential psk signalling in cdma networks

Info

Publication number
CA2214061A1
CA2214061A1 CA002214061A CA2214061A CA2214061A1 CA 2214061 A1 CA2214061 A1 CA 2214061A1 CA 002214061 A CA002214061 A CA 002214061A CA 2214061 A CA2214061 A CA 2214061A CA 2214061 A1 CA2214061 A1 CA 2214061A1
Authority
CA
Canada
Prior art keywords
signal
phase
bit group
message bit
demodulated
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
CA002214061A
Other languages
French (fr)
Other versions
CA2214061C (en
Inventor
Jin-Meng Ho
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 CA2214061A1 publication Critical patent/CA2214061A1/en
Application granted granted Critical
Publication of CA2214061C publication Critical patent/CA2214061C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/18Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20Modulator circuits; Transmitter circuits
    • H04L27/2032Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2053Modulator 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
    • H04L27/206Modulator 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
    • H04L27/2067Modulator 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
    • H04L27/2071Modulator 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/18Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22Demodulator circuits; Receiver circuits
    • H04L27/233Demodulator circuits; Receiver circuits using non-coherent demodulation
    • H04L27/2332Demodulator circuits; Receiver circuits using non-coherent demodulation using a non-coherent carrier

Abstract

A method and a system for detecting a user signal in a CDMA network.
(Coded) user message bits are grouped into successive groups. A differential phase is generated for each message bit group by mapping each message bit group on to a predetermined PSK constellation. An absolute phase is generated for each message bit group based on the differential phase for the current message bit group and the absolute phase for the preceding message bit group. The absolute phase signal is phase keyed to an RF carrier to form an RF signal. The RF signal is spread using two code sequences and the spread RF signal is transmitted. At the receiver, the RF signal is received and non-coherently demodulated. The demodulated RF signal is despread using the codesequences. Successive blocks of the demodulated, despread RF signal are phase compared for extracting the differential phase signal carrying the (coded) user message.
CA002214061A 1997-03-04 1997-08-21 Differential psk signalling in cdma networks Expired - Fee Related CA2214061C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US808,776 1997-03-04
US08/808,776 US6072785A (en) 1997-03-04 1997-03-04 Differential PSK signalling in CDMA networks

Publications (2)

Publication Number Publication Date
CA2214061A1 true CA2214061A1 (en) 1998-09-04
CA2214061C CA2214061C (en) 2001-08-14

Family

ID=25199709

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002214061A Expired - Fee Related CA2214061C (en) 1997-03-04 1997-08-21 Differential psk signalling in cdma networks

Country Status (4)

Country Link
US (1) US6072785A (en)
EP (1) EP0863643A3 (en)
JP (1) JPH10294719A (en)
CA (1) CA2214061C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999059280A1 (en) * 1998-05-14 1999-11-18 Masahichi Kishi Code division multiple access (cdma) transmission system
ES2308796T3 (en) * 1998-08-21 2008-12-01 Lucent Technologies Inc. CDMA MULTI-CODE SYSTEM THAT USES AN ITERATIVE DECODIFICATION.
FR2822001B1 (en) * 2001-03-06 2003-06-27 France Telecom DEVICE FOR EQUALIZING AND DECODING FREQUENCY SELECTIVE CHANNELS
KR100439220B1 (en) * 2002-03-26 2004-07-05 엘지전자 주식회사 Circuit and operation method for keeping quality of signal in CDMA system
US7292547B1 (en) * 2002-05-22 2007-11-06 The Directv Group, Inc. Device and method for nodal multiple access into communications channels
KR100600828B1 (en) * 2003-12-09 2006-07-14 한국전자통신연구원 Receiving apparatus of wake-up information
US20090273439A1 (en) * 2008-05-01 2009-11-05 Richard Selsor Micro-chip ID
KR101647922B1 (en) * 2015-04-10 2016-08-11 재단법인대구경북과학기술원 System and method for symbol repetition of non-coherent dpsk
FR3085568B1 (en) * 2018-08-31 2020-08-07 Zodiac Data Systems METHOD OF DATETING TELEMETRY SIGNALS

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651320A (en) * 1984-12-24 1987-03-17 American Telephone And Telegraph Company Inband coding of secondary data
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
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
US5329547A (en) * 1993-03-11 1994-07-12 Motorola, Inc. Method and apparatus for coherent communication in a spread-spectrum communication system
CA2121934A1 (en) * 1993-06-14 1994-12-15 Gordon Bremer Simultaneous analog and digital communication with improved phase immunity
MY112371A (en) * 1993-07-20 2001-05-31 Qualcomm Inc System and method for orthogonal spread spectrum sequence generation in variable data rate systems
US5506861A (en) * 1993-11-22 1996-04-09 Ericsson Ge Mobile Comminications Inc. System and method for joint demodulation of CDMA signals
JP3421880B2 (en) * 1994-10-05 2003-06-30 ソニー株式会社 Demodulator
US5608722A (en) * 1995-04-03 1997-03-04 Qualcomm Incorporated Multi-user communication system architecture with distributed receivers
US5767738A (en) * 1996-10-21 1998-06-16 Motorola, Inc. Apparatus and method for demodulating a modulated signal
US6072770A (en) * 1997-03-04 2000-06-06 At&T Corporation Method and system providing unified DPSK-PSK signalling for CDMA-based satellite communications

Also Published As

Publication number Publication date
EP0863643A2 (en) 1998-09-09
EP0863643A3 (en) 2000-03-08
CA2214061C (en) 2001-08-14
US6072785A (en) 2000-06-06
JPH10294719A (en) 1998-11-04

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20170821

MKLA Lapsed

Effective date: 20170821