Matched filter, filtering method and digital broadcast...

Details Matched filter, filtering method and digital broadcast... Matched filter, filtering method and digital broadcast...

2005-12-27

2005-12-27

Patel, Jay K. (Department: 2637)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S341000, C375S342000

Reexamination Certificate

active

06980609

ABSTRACT:
A digital passband matched filter is automatically adapted to a carrier wave ω in accordance with a frequency offset of the carrier wave, to obtain a passband digital signal having no frequency distortion due to the frequency offset. Thus, a receiver in which drawbacks such as decrease of SNR and increase of circuit complexity caused by the fixed baseband/passband matched filter is obtained. Since a cosine wave generating section operates in a carrier wave frequency restoring mode and a carrier wave frequency adaptive mode, respectively, a single cosine wave ROM table can be used regardless of the respective operating modes, thereby reducing circuit complexity. Since the digital passband matched filter acts to renew the filter coefficients adapted to the carrier wave adaptive mode only, power consumption required to operate the filter can be minimized.

REFERENCES:
patent: 5555268 (1996-09-01), Fattouche et al.
patent: 5745525 (1998-04-01), Hunsinger et al.
patent: 5802102 (1998-09-01), Davidovici
patent: 5872815 (1999-02-01), Strolle et al.
patent: 6055281 (2000-04-01), Hendrickson et al.
patent: 6192088 (2001-02-01), Aman et al.
patent: 6426972 (2002-07-01), Endres et al.

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