Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1994-08-02
1997-10-21
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Interference or noise reduction
455132, H04B 710, H04L 102
Patent
active
056804199
ABSTRACT:
A digital radio communications system is presented in which the deleterious effects of fading, time dispersion and interference found in the channel are mitigated by using interference rejection and diversity combining. Digital signals representative of digital symbol sequences are transmitted through a radio channel in which the signals may be corrupted by fading, time dispersion and interference. The corrupted signals are received by a receiver having one or more antennas. The received signals are processed to form a received signal sample stream r.sub.d (kT.sub.s) for each of the antennas. Estimated received signal samples for each of the antennas are produced by combining hypothesized signal sequences and models of each channel. The received signal samples and the estimated received signal samples are processed in conjunction with an estimate of the impairment correlation properties to produce branch metrics to be used by a Viterbi, or other sequence estimation, algorithm. The branch metric processor may assume one of several configurations depending on whether or not the channel is time-varying.
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Bocure Tesfaldet
Ericsson Inc.
Stasik Eric L.
Webster Bryan
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