Selective filtering for co-channel interference reduction

Details Selective filtering for co-channel interference reduction Selective filtering for co-channel interference reduction

1996-11-29

1998-12-08

Chan, Jason

Pulse or digital communications

Receivers

Interference or noise reduction

375346, 364574, 370210, H04B 110

Patent

active

058481087

ABSTRACT:
Complex signal samples of an input signal are supplied to via a frequency down-shifter to a digital filter, and to a time-frequency transform unit which produces a plurality of frequency components each associated with a respective frequency band within a bandwidth of the input signal. The frequency component having the maximum momentary energy is determined to determine the down-shifting frequency for the associated frequency band to be filtered, and to determine a complementary up-shifting following the digital filter to produce an output signal. The filter can be a bandpass filter or a bandstop filter, especially for reducing co-channel interference in different types of wireless communications systems.

REFERENCES:
patent: 4630304 (1986-12-01), Borth et al.
patent: 5086340 (1992-02-01), Citta et al.
patent: 5715282 (1996-05-01), Mansouri et al.
patent: 5727032 (1995-10-01), Jamal et al.
patent: 5745187 (1995-12-01), Hulyalkar et al.
patent: 5748226 (1996-11-01), Limberg

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