CA2003954A1 - Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems - Google Patents

Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems

Info

Publication number
CA2003954A1
CA2003954A1 CA2003954A CA2003954A CA2003954A1 CA 2003954 A1 CA2003954 A1 CA 2003954A1 CA 2003954 A CA2003954 A CA 2003954A CA 2003954 A CA2003954 A CA 2003954A CA 2003954 A1 CA2003954 A1 CA 2003954A1
Authority
CA
Canada
Prior art keywords
symbol
frequency offset
time division
sixteen
circuitry
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
CA2003954A
Other languages
French (fr)
Other versions
CA2003954C (en
Inventor
Justin Che-I Chuang
Nelson Ray Sollenberger
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.)
Iconectiv LLC
Original Assignee
Bell Communications Research Inc
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 Bell Communications Research Inc filed Critical Bell Communications Research Inc
Publication of CA2003954A1 publication Critical patent/CA2003954A1/en
Application granted granted Critical
Publication of CA2003954C publication Critical patent/CA2003954C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
    • 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

Abstract

ABSTRACT OF THE DISCLOSURE
In order to correctly demodulate a received sequential burst of symbols in a time division multiplexed/time division multiple access (TDM/TDMA) portable radio digital telephony communications system, proper timing of the sampling time in each received symbol of the burst is necessary. In addition, in order to compensate for component drift, an estimate of the frequency offset between transmitting and receiving units is also required. A method and circuitry for estimating symbol timing and frequency offset is disclosed in which the IF radio signal is sampled and digitized at a sampling rate which is sixteen times the symbol rate. The digitized samples are processed to obtain phase values. A one symbol delay is introduced and differential phase values derived, a differential phase valve being derived for each of the sixteen sampling times per symbol.
The differential values are collapsed into one quadrant in the phase plane and then expanded back to the full plane. For each of the sixteen sampling times, a separate vector sum is formed of the expanded and collapsed differential phase values over substantially the entire burst. Symbol timing is selected to be the particular one-of-the-sixteen sampling times at which the vector sum has the largest magnitude. Frequency offset is directly determined from the angle in the phase plane of that vector having the largest magnitude.
CA002003954A 1989-11-16 1989-11-27 Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems Expired - Lifetime CA2003954C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/437,758 US4941155A (en) 1989-11-16 1989-11-16 Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems
US437,758 1989-11-16

Publications (2)

Publication Number Publication Date
CA2003954A1 true CA2003954A1 (en) 1991-05-16
CA2003954C CA2003954C (en) 1993-12-07

Family

ID=23737759

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002003954A Expired - Lifetime CA2003954C (en) 1989-11-16 1989-11-27 Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems

Country Status (2)

Country Link
US (1) US4941155A (en)
CA (1) CA2003954C (en)

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Also Published As

Publication number Publication date
CA2003954C (en) 1993-12-07
US4941155A (en) 1990-07-10

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