Pulse or digital communications – Testing – Signal noise
Patent
1997-01-29
1999-03-23
Pham, Chi H.
Pulse or digital communications
Testing
Signal noise
375228, 375224, 375344, H04B 1700, H04L 2706
Patent
active
058870318
ABSTRACT:
A system for symbol timing maintenance in a communications receiver, in one embodiment, employs a receive channel, including a demodulator and an analog-to-digital converter for generating a plurality of samples; a symbol timing statistic generator for generating a symbol timing statistic in response to a portion of the plurality of samples; a noise estimator for generating an estimate of a noise level in response to the plurality of samples; a reception interval determiner for determining a reception interval; and a control loop for generating a signal indicative of symbol timing error. In an alternative embodiment, the system may, in addition to or instead of the noise estimator, and reception interval determiner, employ a bandwidth tuner for tuning a bandwidth of the control loop in response to the signal indicative of the symbol timing error having been generated.
REFERENCES:
patent: 5440590 (1995-08-01), Birchler et al.
patent: 5566214 (1996-10-01), Kroeger et al.
patent: 5619524 (1997-04-01), Ling et al.
patent: 5644599 (1997-07-01), Hess
patent: 5659576 (1997-08-01), Critchlow et al.
Hobza Jim
Parr Michael
Hughes Electronics Corporation
Pham Chi H.
Sales Michael W.
Tran Khai
Whelan John T.
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