CA2152781A1 - Digital demodulator with frequency and timing control - Google Patents

Digital demodulator with frequency and timing control

Info

Publication number
CA2152781A1
CA2152781A1 CA002152781A CA2152781A CA2152781A1 CA 2152781 A1 CA2152781 A1 CA 2152781A1 CA 002152781 A CA002152781 A CA 002152781A CA 2152781 A CA2152781 A CA 2152781A CA 2152781 A1 CA2152781 A1 CA 2152781A1
Authority
CA
Canada
Prior art keywords
data
psk signal
phase estimates
signal
frequency
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
CA002152781A
Other languages
French (fr)
Other versions
CA2152781C (en
Inventor
James E. Petranovich
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.)
Skyworks Solutions Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2152781A1 publication Critical patent/CA2152781A1/en
Application granted granted Critical
Publication of CA2152781C publication Critical patent/CA2152781C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • H04L27/2338—Demodulator circuits; Receiver circuits using non-coherent demodulation using sampling
    • 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
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • H04L7/0331—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/042—Detectors therefor, e.g. correlators, state machines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/08—Speed or phase control by synchronisation signals the synchronisation signals recurring cyclically

Abstract

A PSK signal is received and digitized in a limiter (26) to substantially remove the signal's amplitude characteristics. A phase detector (44) receives the digital data and, based upon transitions in the data between high and low states, provides phase estimates. The phase estimates are converted by a data decoder (50) into binary data representing the symbols transmitted to form the PSK signal. A number of overlapping windows of digital data are used to determine phase estimates.
A unique word detector (52) receives binary data from the data decoder (50) and, using a correlation technique, identifies one set of windows which substantially maximizes synchronization of the demodulator with the received PSK signal. After the synchronizing window has been identified, an automatic frequency controller (46) monitors any frequency drift of the PSK signal and corrects the phase estimates.
CA002152781A 1992-12-31 1993-12-30 Digital demodulator with frequency and timing control Expired - Fee Related CA2152781C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/999,210 US5376894A (en) 1992-12-31 1992-12-31 Phase estimation and synchronization using a PSK demodulator
US07/999,210 1992-12-31
PCT/US1993/012697 WO1994016512A1 (en) 1992-12-31 1993-12-30 Digital demodulator with frequency and timing control

Publications (2)

Publication Number Publication Date
CA2152781A1 true CA2152781A1 (en) 1994-07-21
CA2152781C CA2152781C (en) 2004-02-24

Family

ID=25546026

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002152781A Expired - Fee Related CA2152781C (en) 1992-12-31 1993-12-30 Digital demodulator with frequency and timing control

Country Status (9)

Country Link
US (5) US5376894A (en)
EP (1) EP0746931B1 (en)
JP (1) JP3803705B2 (en)
AT (1) ATE308843T1 (en)
AU (1) AU5963194A (en)
CA (1) CA2152781C (en)
DE (1) DE69333899T2 (en)
SG (1) SG49335A1 (en)
WO (1) WO1994016512A1 (en)

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DE69333899T2 (en) 2006-08-03
DE69333899D1 (en) 2005-12-08
EP0746931B1 (en) 2005-11-02
ATE308843T1 (en) 2005-11-15
US5594758A (en) 1997-01-14
US5524127A (en) 1996-06-04
WO1994016512A1 (en) 1994-07-21
AU5963194A (en) 1994-08-15
CA2152781C (en) 2004-02-24
US5610949A (en) 1997-03-11
SG49335A1 (en) 1998-05-18
EP0746931A4 (en) 1999-12-15
EP0746931A1 (en) 1996-12-11
JPH08505499A (en) 1996-06-11
JP3803705B2 (en) 2006-08-02
US5376894A (en) 1994-12-27
US5625652A (en) 1997-04-29

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