Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-10-10
1999-11-30
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
455296, 375350, 364574, H04B 110, H04L 2508
Patent
active
059955651
ABSTRACT:
Co-channel interference in baseband digital samples of an FM communications (e.g. AMPS) signal is cancelled by a complex signal limiter and non-linear filter (CLNF), to which the samples are supplied, and a time-varying null filter unit, to which the output samples from the CLNF are supplied, for separating the desired signal from residual interference. The output samples from the CLNF are also supplied via a selective narrow band filter bank to a non-linear transform unit for producing an energy based demodulation signal from which time-varying coefficients for the null filter are obtained. The units can be used individually or in different arrangements and combinations, and the transform unit can be augmented and used to replace a conventional FM demodulator.
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Kammeyer, et al., "A. Modified Adaptive FIR Equalizer for Multipath Echo Cancellation in FM Transmission", I.E.E.E. Journal on Selected Areas in Communications, SAC-5, No. 2, New York, NY, (Feb. 1987), pp. 226-237.
Filatov Anatoly Gennadiyvich
Garmonov Alexander Vasiliyevich
Javed Alauddin
Kotov Anatoli Vasilievich
Savinkov Andrey Yuriyevich
Chin Stephen
Ghayour Mohammad
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