Pulse or digital communications – Receivers – Automatic frequency control
Patent
1997-02-10
1998-12-01
Pham, Chi H.
Pulse or digital communications
Receivers
Automatic frequency control
375345, 375317, 332125, 332128, 455 32, 4551822, 4551922, H04L 2706, H04L 2506, H03C 304, H04H 100
Patent
active
058449485
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 receives the baseband signal and produces a compensation signal for canceling the frequency offset error. The demodulator/decoder performs the frequency-offset error compensation digitally. The demodulator/decoder includes an A/D converter which over-samples (samples at a rate of more than two samples per symbol period) the baseband signal and converts it to digital form. The demodulator/decoder also includes a complex multiplier which multiplies the over-sampled digital baseband signal by the compensation signal to produce an offset-error-canceled signal. The complex multiplier is followed by a decimation block which reduces the sample rate of the offset-error-canceled signal to two samples per symbol period. This embodiment has a substantially increased frequency offset tracking range, which allows for the use of relaxed tolerances in the tuner and/or LNB.
REFERENCES:
patent: 5450447 (1995-09-01), Dutta
patent: 5475710 (1995-12-01), Ishizu et al.
patent: 5483555 (1996-01-01), Hattori
patent: 5535441 (1996-07-01), Jackson et al.
patent: 5654774 (1997-08-01), Pugel et al.
Ben-Efraim Nadav
Keate Christopher R.
Kivlin B. Noel
LSI Logic Corporation
Pham Chi H.
Tran Khai
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