Co-channel interference reduction

Details Co-channel interference reduction Co-channel interference reduction

1995-11-30

1998-07-07

Crosland, Donnie L.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455308, 455311, 455501, 455 63, 455 673, 455210, 4552781, 455296, 375346, 375350, 329318, 329320, 329321, H04B 110, H03D 300

Patent

active

057783101

ABSTRACT:
Co-channel interference of a frequency modulated signal represented by complex signal samples is reduced by amplitude limiting each sample and non-linearly filtering the limited samples. The non-linear filter low pass filters the limited samples, multiplies the filtered samples by their complex conjugates, and high pass filters the products to produce resultant signal samples. It also squares the filtered samples, low pass filters the squared samples, multiplies the filtered squared signals by the complex conjugates of the filtered samples, combines the result with said resultant signal samples and the filtered samples, and low pass filters the combined signal to produce samples having reduced co-channel interference. The limiter and non-linear filter can be constituted by a digital signal processor.

REFERENCES:
patent: 5355533 (1994-10-01), Dickerson
patent: 5512957 (1996-04-01), Hulyalkar
"A Modified Adaptive FIR Equalizer for Multipath Echo Cancellation in FM Transmission", K.D. Kammeyer et al., IEEE Journal on Selected Areas in Communications, vol. SAC-5, No. 2, Feb. 1987, pp. 226-237.
Quadratic Filters for Signal Processing, G.L. Sicuranza, Proceedings of the IEEE, vol. 80, No. 8, 1 Aug. 1992, pp. 1263-1285.

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