Diversity system of selection type equipped with a code...

Details Diversity system of selection type equipped with a code... Diversity system of selection type equipped with a code...

H - Electricity

04

L

325/72

H04L 1/02 (2006.01) H04L 27/227 (2006.01)

Patent

CA 1238369

6446-327 ABSTRACT A diversity system of the selection type is disclosed. It includes N (?- 2) receivers for receiving multi-phase PSK or multi-level QAM waves carrying differentially modulo-M (equal to or more than 2) encoded digital signals and providing N sequences of demodulated digital signals by phase- detecting the waves with a recovered carrier wave. Selector circuitry is pro- vided for selecting out of the N sequences of demodulated digital signals one with a low bit error rate. The selected one of the sequence of demodulated digital signals is aligned with other sequences of demodulated digital signals, thereby providing a demodulated digital signal sequence retaining the differ- ential encoding as the output of the selector circuitry. In the system of the invention differential decoders in the relay station are dispensed with. 67349/84

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