HK1002134A1 - Digital demodulator for pi/4 - qpsk signals - Google Patents

Digital demodulator for pi/4 - qpsk signals Download PDF

Info

Publication number
HK1002134A1
HK1002134A1 HK98101224A HK98101224A HK1002134A1 HK 1002134 A1 HK1002134 A1 HK 1002134A1 HK 98101224 A HK98101224 A HK 98101224A HK 98101224 A HK98101224 A HK 98101224A HK 1002134 A1 HK1002134 A1 HK 1002134A1
Authority
HK
Hong Kong
Prior art keywords
signal
decision
phase
sampling
decision error
Prior art date
Application number
HK98101224A
Other languages
German (de)
English (en)
French (fr)
Chinese (zh)
Other versions
HK1002134B (en
Inventor
Sato Toshifumi
Shibata Takayuki
Ohmura Hideo
Original Assignee
Nec Corporation
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 Nec Corporation filed Critical Nec Corporation
Publication of HK1002134B publication Critical patent/HK1002134B/en
Publication of HK1002134A1 publication Critical patent/HK1002134A1/en

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Classifications

    • 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
    • H04L27/2335—Demodulator circuits; Receiver circuits using non-coherent demodulation using temporal properties of the received signal
    • H04L27/2337—Demodulator circuits; Receiver circuits using non-coherent demodulation using temporal properties of the received signal using digital techniques to measure the time between zero-crossings

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
HK98101224A 1992-02-27 1998-02-17 Digital demodulator for pi/4 - qpsk signals HK1002134A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP4169892 1992-02-27
JP4168392 1992-02-27
JP04041683 1992-02-27
JP04041698 1992-02-27

Publications (2)

Publication Number Publication Date
HK1002134B HK1002134B (en) 1998-07-31
HK1002134A1 true HK1002134A1 (en) 1998-07-31

Family

ID=26381337

Family Applications (1)

Application Number Title Priority Date Filing Date
HK98101224A HK1002134A1 (en) 1992-02-27 1998-02-17 Digital demodulator for pi/4 - qpsk signals

Country Status (7)

Country Link
US (1) US5412694A (enExample)
EP (1) EP0558034B1 (enExample)
AU (1) AU658482B2 (enExample)
CA (1) CA2090367C (enExample)
DE (1) DE69310572T2 (enExample)
HK (1) HK1002134A1 (enExample)
SG (1) SG50573A1 (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2643792B2 (ja) * 1993-09-14 1997-08-20 日本電気株式会社 復調装置
IL107656A (en) * 1993-11-18 1996-11-14 Dsp Telecomm Ltd Demodulator
JP3349830B2 (ja) * 1994-07-29 2002-11-25 沖電気工業株式会社 クロック発生回路
EP1420520B1 (en) * 1994-09-09 2009-12-09 XIRCOM Wireless, Inc. Despreading of a CPM (continuous phase modulation) spread-spectrum signal
JP3390272B2 (ja) * 1994-11-10 2003-03-24 沖電気工業株式会社 同期検波回路
US5719903A (en) * 1995-06-28 1998-02-17 Motorola, Inc. Method and apparatus for receiving symbols
US5943371A (en) * 1997-03-24 1999-08-24 Delco Electronics Corporation Memory efficient time de-interleave, de-puncture and viterbi decoder circuitry
US5946293A (en) * 1997-03-24 1999-08-31 Delco Electronics Corporation Memory efficient channel decoding circuitry
DE19732894C2 (de) * 1997-07-30 1999-11-11 Siemens Ag Verfahren und Anordnungen zum schnellen Synchronisieren zweier Trägersignale
JPH11177644A (ja) * 1997-12-15 1999-07-02 Nec Corp ビットタイミング再生回路
US7213257B1 (en) * 1999-09-15 2007-05-01 Trilithic, Inc. Determining phase linearity in CATV distribution systems
US7095749B1 (en) 2000-06-12 2006-08-22 Koninkijke Phillips Electronics N.V. Apparatus and method for extraction of different types of packets from respective portions of a single buffer
JP3481574B2 (ja) * 2000-09-19 2003-12-22 沖電気工業株式会社 復調装置
JP4365814B2 (ja) * 2005-09-26 2009-11-18 株式会社東芝 受信機および無線通信装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4466108A (en) * 1981-10-06 1984-08-14 Communications Satellite Corporation TDMA/PSK Carrier synchronization without preamble
DE3461238D1 (en) * 1983-01-12 1986-12-11 Ncr Co Circuit for reducing errors in a data receiver
US4814719A (en) * 1987-12-14 1989-03-21 Ford Aerospace & Communications Corporation Unsymmetrical QPSK demodulator
US4849991A (en) * 1988-06-29 1989-07-18 Bell Communications Research, Inc. Method and circuitry for determining symbol timing for time division multiple access radio systems
US4896336A (en) * 1988-08-29 1990-01-23 Rockwell International Corporation Differential phase-shift keying demodulator
US5202901A (en) * 1991-05-21 1993-04-13 General Electric Company Digital discriminator for pulse shaped π/4 shifted differentially encoded quadrature phase shift keying

Also Published As

Publication number Publication date
CA2090367C (en) 1997-09-30
DE69310572D1 (de) 1997-06-19
AU3384193A (en) 1993-09-02
SG50573A1 (en) 1998-07-20
EP0558034A3 (enExample) 1994-01-05
AU658482B2 (en) 1995-04-13
EP0558034A2 (en) 1993-09-01
DE69310572T2 (de) 1997-09-11
US5412694A (en) 1995-05-02
CA2090367A1 (en) 1993-08-28
EP0558034B1 (en) 1997-05-14

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20070226