Pulse or digital communications – Repeaters – Testing
Patent
1981-02-23
1982-10-19
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
370 93, 455 62, 375 62, H04J 600, H04B 712
Patent
active
043553990
ABSTRACT:
The present invention relates to a transmitter, a receiver and techniques for use in a frequency-hopping, multilevel frequency shift keyed (FH-MFSK) radio system which permits the selective concurrent transmission of one or two encoded frequencies per time slot of the transmitted sequence for improving reception at a receiver experiencing interference from the system transmitters above a predetermined interference threshold level. An alternative arrangement permits all transmitters and receivers to communicate with one another by transmitting a separate one of multiple frequencies in a separate one of an equal number of multiple frequency subbands forming the system frequency band during each time slot for providing flexibility in system design. Combinations of the two arrangements can also be employed.
REFERENCES:
patent: 4066964 (1978-01-01), Costanza et al.
patent: 4193030 (1980-03-01), Rabow et al.
patent: 4271524 (1981-06-01), Goodman et al.
patent: 4320514 (1982-03-01), Haskell
A. J. Viterbi, "A Processing Satellite Transponder for Multiple Access by Low-Rate Mobile Users", Oct. 23-25 1978, 4th Int Conf. on Digital Satellite Comm., Montreal, Canada, pp. 166-174.
Cooper and Nettleton "A Spread Spectrum Technique for High Capacity Mobile Communication", Nov. 1978, IEEE Transactions on Vehicular Tech., vol. VT-27, No. 4, pp. 264-275.
Grybos et al., "A Receiver Feasibility Study for the Spread Spectrum High Capacity Mobile Radio System", Mar. 22-24 1978, Conference Rec. 28th IEEE Vehicular Tech Conf., Denver Colo., pp. 98-104.
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.
Goodman et al., "Frequency Hopped Multilevel FSK for Mobile Radio", Mar. 4-6, 1980, IEEE 1980 International Zurich Seminar on Digital Communication, pp. A5.1-A5.6.
Bell Telephone Laboratories Incorporated
Chin Stephen
Pfeifle Erwin W.
Safourek Benedict V.
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