Adaptive tuning to improve demodulator performance

Details Adaptive tuning to improve demodulator performance Adaptive tuning to improve demodulator performance

2007-08-10

2011-10-25

Trinh, Sonny (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S182100

Reexamination Certificate

active

08046015

ABSTRACT:
A receiver is tuned to a transmission frequency of a data signal after the receiver has already locked onto a frequency carrying the data signal. A frequency offset between a locked frequency of a tuner on the receiver and the actual transmission frequency is determined by a comparator. If the frequency offset is greater than a threshold value, then the tuner is stepped to another frequency and the frequency offset is determined again. The direction of the tuning step can be determined by comparing multiple frequency offsets. An average value of multiple frequency offset measurements may also be used to determine if the tuner should retune to another frequency by comparison with the threshold value.

REFERENCES:
patent: 5170497 (1992-12-01), Uchikura
patent: 5280640 (1994-01-01), Bae
patent: 5305464 (1994-04-01), Frett
patent: 5731741 (1998-03-01), Yamamoto et al.
patent: 5828710 (1998-10-01), Beale
patent: 6173164 (2001-01-01), Shah
patent: 7123650 (2006-10-01), Asia et al.
patent: 7127010 (2006-10-01), Parker
PCT Search Report & Written Opinion, RE: Application #PCT/US2008/070245; Oct. 1, 2008.

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