Pulse or digital communications – Repeaters – Testing
Patent
1980-06-09
1983-05-10
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 22, 455 32, 370 93, H04J 600, H04K 100
Patent
active
043833233
ABSTRACT:
The present invention relates to transmitters (10) and receivers (30) for use in a spread spectrum radio communication system wherein transmitters generate FH-MFSK signals by adding elements of each user's Q level encoded message sample and that user's unique Q level, L-length frequency-hopping address sequence using the rules of algebra for finite fields. The receivers (a) spectrum analyze received transmissions during each chip or period of the L-length sequence to determine which Q level frequencies are received and (b) generate a set of decoded message signals by subtracting corresponding chip elements of a particular user's FH address sequence from those of the detected frequency levels using the rules of algebra for finite fields. The receivers then (c) determine which levels have a maximum length, and if only one then that level is determined as the correct message level and (d) if multiple maximum-length levels are determined then for each maximum-length level the set is permuted and the individual chips checked in a unique manner to determine the correct message level.
REFERENCES:
patent: 4066964 (1978-01-01), Costanza et al.
patent: 4193030 (1980-03-01), Rabow et al.
IEEE 27th Vehicular Conf. Record, Mar. 16-18, 1977, "A Spread Spectrum Technique for High Capacity Mobile Communications," G. R. Cooper et al., pp. 98-103.
IEEE 28th Vehicular Conf. Record, Mar. 22-24, 1978, Grybos et al., pp. 98-104.
4th Int. Conf. on Digital Satellite Comm., Oct. 23-25, 1978, A. J. Viterbi, pp. 166-174.
1979 Ultrasonics Symposium Proceedings, Sep. 26-28, 1979, "A Satellite-Borne SAW Chirp Transform. System . . . ," R. C. Williamson et al.
IEEE 1980 Int. Zurich Seminar on Digital Comm., Mar. 4-6, 1980, pp. A5.1-A5.6, D. J. Goodman et al.
Bell Telephone Laboratories Incorporated
Pfeifle Erwin W.
Safourek Benedict V.
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