Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-12-20
1994-08-16
Bocure, Tesfaldet
Pulse or digital communications
Spread spectrum
Direct sequence
455139, 348469, H04B 710, H04L 102
Patent
active
053393341
ABSTRACT:
The disclosure relates to methods and apparatus for combining a multiplicity of diversely received replicas of a signal originating in the same remote transmitter. The disclosed methods and apparatus apply, in particular, to digitally modulated sinusoidal prime-carriers or subcarriers, and base the final decision about which of the code alphabet symbols is present in each bit-symbol time slot on either: a) the maximum value of a decision index for each code alphabet letter indicated in/for the same bit time-slot by parallel bit-by-bit detection of the diverse replicas of the signal, the decision index being defined as a function only of the pre-video (IF carrier or subcarrier) signal-to-noise power ratios of the various signal replicas that yield the same code alphabet letter; or on b) bit-by-bit detection of the maximal ratio combination of the video (or pre-bit-detection) bit-stream waveforms out of the prime-carrier or subcarrier exponent (i.e., phase or frequency) demodulators.
REFERENCES:
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patent: 4015205 (1977-03-01), Ikeda et al.
patent: 4052670 (1977-10-01), Watanabe et al.
patent: 4349914 (1982-09-01), Evans
patent: 4513249 (1985-04-01), Baghdady
patent: 4733402 (1988-03-01), Monsen
patent: 5128969 (1992-07-01), Baghdady
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