Method and apparatus for offset frequency estimation for a coher

Details Method and apparatus for offset frequency estimation for a coher Method and apparatus for offset frequency estimation for a coher

1995-03-10

1997-06-17

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Automatic frequency control

375208, 375343, 455136, H04K 100, H03L 706

Patent

active

056404310

ABSTRACT:
A method and apparatus for improved offset frequency estimation includes in a first embodiment a receiver (100) for coherent reception of a signal having known reference information, the receiver including an extractor (106) for extracting the reference information (107) from the signal, and an offset frequency estimator (110). The offset frequency estimator (110) includes a filter (121) for filtering the reference information and outputting a filtered reference sequence; a correlator (122, 124) for correlating the filtered reference sequence against a predetermined reference signal to form correlation values; and a peak detector (126) for determining an offset frequency estimate (131) from the correlation values. Other embodiments are also shown.

REFERENCES:
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5181225 (1993-01-01), Neeser et al.
patent: 5214669 (1993-05-01), Zarembowitch
patent: 5329547 (1994-07-01), Ling
patent: 5377227 (1994-12-01), Hurlbut et al.
patent: 5430759 (1995-07-01), Yokev et al.
Irvine, Garrick T., "Symbol-Aided Plus Decision-Directed Reception for PSK/TCM Modulation on Shadowed Mobile Satellite Fading Channels", IEEE Journal on Selected Areas in Communications, vol. 10, No. 8, Oct. 1992, pp. 1289-1299.

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