Pulse or digital communications – Repeaters – Testing
Patent
1989-02-17
1991-09-10
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
375 90, 329300, H04L 2710
Patent
active
050480588
ABSTRACT:
An embodiment of the transmission system comprises an MSK linear-modular transmitter and an MSK differentially coherent receiver connected by a transmission medium 3. A system embodying the invention is essentially characterized by filters in the receiver including analog or digital equalizers and by a differential encoding carried out on symbols of a message to be transmitted by a differential encoder included in the transmitter. The function of the equalizer is to eliminate intersymbol inteference in received signals. The differential encoding carried out is such that a coded symbol of rank k issued by the encoder depends on the corresponding symbol of the message and on the coded symbol of rank k-M, whereby M is an odd integer preferably greater than 1. On reception the probability of decision error with regard to a received symbol is all the lower that the integer M is high. The value M=3 is an appropriate value.
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Chin Stephen
Olms Douglas W.
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