System and method for fast channel switching in a satellite rece

Details System and method for fast channel switching in a satellite rece System and method for fast channel switching in a satellite rece

1997-02-10

1999-11-30

Tse, Young T.

Pulse or digital communications

Receivers

Automatic frequency control

375329, 375345, 329304, H04L 2722

Patent

active

059955635

ABSTRACT:
A DBS receiver front end which converts the received signal directly to the baseband representation and maintains a high performance with a new techniques for tracking and counteracting frequency drift and I/Q angular error. The DBS receiver front end comprises a tuner and a demodulator/decoder. The tuner receives a high frequency signal and converts it to a baseband signal having a frequency offset error. In one embodiment, the DBS receiver front end includes a demodulator/decoder which preserves frequency offset error tracking through a channel change. The demodulator/decoder receives the baseband signal and produces a compensation signal for canceling the frequency offset error. This is done using an element which generates a value indicative of the frequency offset error. Since the frequency offset error is independent of the selected channel, freezing the value indicative of the frequency offset error during a channel change enables a much faster acquisition of timing. In this manner faster channel acquisition is obtained.

REFERENCES:
patent: 4348641 (1982-09-01), Scott et al.
patent: 5255290 (1993-10-01), Anvari
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5440268 (1995-08-01), Taga et al.
patent: 5579345 (1996-11-01), Kroeger et al.

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