Pulse or digital communications – Repeaters – Testing
Patent
1980-06-09
1982-03-16
Swann, III, Glen R.
Pulse or digital communications
Repeaters
Testing
375 34, 375 58, 455 29, H04B 712
Patent
active
043205143
ABSTRACT:
The present invention relates to a spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, Q level frequency shift keyed signals to determine the correct signal of a particular user. In operation, the receiver spectrum analyzes the received signal to determine which frequency components are present during each of the L chip intervals and then demodulates a particular user's L-length FH address signal with the derived frequency components to arrive at a Q by L-length detection matrix. A detector and checking processor determines which L-length matrix rows have a maximum number of entries and if only one such row exists, that level is deemed the correct message level. Where multiple maximum-length rows are found the processor uses the address sequences of all other users to check if the row entries could have been caused by interference. The row with the minimum matches is deemed the correct message level.
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Bell Telephone Laboratories Incorporated
Pfeifle Erwin W.
Swann III Glen R.
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