Interference suppression in CDMA systems

Details Interference suppression in CDMA systems Interference suppression in CDMA systems

1993-09-24

1994-08-30

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 370 18, 375 58, 375 94, 375 96, 375 99, 375101, 375102, 375103, 455 501, 455 63, 455283, 455284, 455296, 455303, 455305, 455306, 455307, 455 673, H04L 2730, H04L 100, H04B 110

Patent

active

053434960

ABSTRACT:
Circuitry and concomitant methodology for demodulating Direct-Sequence, Spread-Spectrum Code-Division Multiple-Access (DS/SS CDMA) channel signal using multiple samples per transmitted symbol and a minimum mean squared error criterion to suppress interference. In one embodiment, a bank of cyclically shifted filters determined with reference to the conventional matched filter for CDMA is used to demodulate the channel signal. In another embodiment, a bank of sub-filters determined with reference to the conventional matched filter for CDMA is employed to demodulate the channel signal. In yet another embodiment, the output of a conventional matched filter is oversampled to demodulate the channel signal. Each embodiment utilizes a set of adaptive coefficients selected to minimize the mean square error between the transmitted symbol and detected symbol.

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