Pulse or digital communications – Repeaters – Testing
Patent
1981-07-01
1983-07-05
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 1, 329104, H03K 1301
Patent
active
043922317
ABSTRACT:
The present invention relates to a decoder for use in a spread spectrum radio receiver which is capable of directly demodulating an L-length frequency-hopped, Q-level frequency shift keyed radio-frequency received signal into a baseband signal wherein a desired user's message signal is decoded into a sequence of tone bursts at a fixed frequency over each L-length sequence. Spectral analysis is performed on the resultant baseband signal either during each chip interval or once at the end of each L-length sequence to permit subsequent detection of a desired user's correct received message signal.
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patent: 4193030 (1980-03-01), Rabow et al.
patent: 4271524 (1981-06-01), Goodman et al.
patent: 4320514 (1982-03-01), Haskell
Cooper et al., "A Spread Spectrum Technique for High Capacity Mobile Communication", from Conf. Rec. 27th, IEEE Vehicular Tech. Conf., Orlando, Fla., pp. 98-103.
D. P. Grybos et al., "A Receiver Feasibility Study for the Spread Spectrum High Capacity Mobile Radio System", by Con. Rec. 28, IEEE Vehicular Tech. Con., Colo., pp. 98-104.
Viterbi, "A Processing Satellite Transponder for Multiple Access by Low Rate Mobile Users", 4th Int. Con. on Digital Satellite Com., Montreal, Canada, pp. 166-174.
Goodman et al., "Frequency Hopped Multilevel FSK for Mobile Radio, IEEE 1980, International Zurich Seminar on Digital Communication, pp. A5.1-A5.6.
R. C. Williamson et al., "A Satellite Borne Saw Chirp-Transform System for Uplink Demodulation of FSK Communication Signals", Sep. 26-28, 1979, 1979 Ultrasonics Symposium Proceedings, New Orleans, La., Paper E-1.
Bell Telephone Laboratories Incorporated
Chin Stephen
Pfeifle Erwin W.
Safourek Benedict V.
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