Adaptive channel filtration for communications systems

Details Adaptive channel filtration for communications systems Adaptive channel filtration for communications systems

2005-12-20

2005-12-20

Ghayour, Mohammed (Department: 2631)

Pulse or digital communications

Receivers

Interference or noise reduction

Reexamination Certificate

active

06977978

ABSTRACT:
Adaptive channel filtration enables a filter to be adaptively optimized for both co-channel and adjacent channel rejection performance (e.g., even as conditions change in a Rayleigh-fading environment). Principles of the present invention may be incorporated into a homodyne-based receiver architecture. In an exemplary homodyne-based receiver, the power of the adjacent channel interferer is calculated (e.g., determined, estimated, etc.), and an associated (e.g., low pass) channel filter is adapted depending on a ratio involving the total power (e.g., the desired channel plus the adjacent channel) and the adjacent channel power. In one or more embodiments, such a ratio is used with a look up table to produce a desired channel filter bandwidth, which may be used as a basis for creating coefficients for utilization by a low pass channel filter.

REFERENCES:
patent: 5512898 (1996-04-01), Norsworthy et al.
patent: 5953380 (1999-09-01), Ikeda
patent: 6141372 (2000-10-01), Chalmers
patent: 6370205 (2002-04-01), Lindoff et al.
patent: 6516185 (2003-02-01), MacNally
patent: 2 328 353 (1999-02-01), None
patent: WO 99/35754 (1999-07-01), None
patent: WO 9935754 (1999-07-01), None
EPO Search Report, RS 105783 US; mailed Jun. 29, 2001.

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