Pulse or digital communications – Receivers – Angle modulation
Patent
1998-03-25
2000-07-18
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375362, 375355, 375344, H04L 2722, H04L 700
Patent
active
060917865
ABSTRACT:
A communication receiver (300) receives (404) a modulated signal, and demodulates the modulated signal to recover a timing signal (202) and a data signal (204) including data symbols. A processing system (316) of the communication receiver determines (406) a rough symbol timing from the timing signal, and forms (408) a timing-carrier search matrix by computing signal quality metrics from the data symbols as a function of predetermined trial variations of the carrier frequency about a nominal carrier frequency and as a function of predetermined trial variations of the symbol timing about the rough symbol timing. The processing system then estimates (410) the symbol timing and the carrier frequency by locating a minimum one of the plurality of signal quality metrics in the timing-carrier search matrix.
REFERENCES:
patent: 5544200 (1996-08-01), An
patent: 5586150 (1996-12-01), Balasubramaniam
patent: 5625573 (1997-04-01), Kim
patent: 5870438 (1999-02-01), Olafsson
Cabrera et al., Eigen Based Methods to Jointly Estimate Frequency and Timing in PSK and MSK Signals, Acoustics, Speech, and Signal Processing, 1992 IEEE Int'l Conf., vol. 5, pp. 413-416.
Chen Weizhong
Dehner Leo George
Breeden R. Louis
Chin Stephen
Deppe Betsy L.
Motorola Inc.
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