Matched filter for combating multipath fading

Details Matched filter for combating multipath fading Matched filter for combating multipath fading

1982-09-29

1985-05-21

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, 364825, 375103, H04B 306

Patent

active

045190844

ABSTRACT:
A carrier and timing recovery technique is disclosed for combating the phase effects of multipath fading occurring during radio transmission. The technique is based on a known mathematical model of multipath fading. A test variable generator (26) develops a number of test variables whose relationship characterizes the multipath distortion. A processor (27) derives a plurality of coefficients of weighting measures from the test variables. The coefficients serve to adjust a matched filter (28) to provide greater use of those portions of the received radio signal yielding higher signal-to-noise ratios than those portions with lesser yields, as well as to compensate for multipath phase perturbations. The technique is also compatible with maximum-likelihood sequence detection techniques to provide further compensation for multipath fading effects.

REFERENCES:
patent: 3937899 (1976-02-01), Denenberg
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4206320 (1980-06-01), Keasler et al.
Greenstein et al., "A Polynomial Model for Multipath Fading Channel Responses", Bell System Technical Journal, Sep. 1980, pp. 1197-1225.
Ungerboeck, "Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems", IEEE Trans. on Comm., vol. COM-22, No. 5, May 1974, pp. 624-636.

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