Spread spectrum FH-MFSK receiver

Details Spread spectrum FH-MFSK receiver Spread spectrum FH-MFSK receiver

1980-02-25

1981-06-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 93, 455 38, H04J 600, H04B 1500

Patent

active

042715245

ABSTRACT:
The present invention relates to a majority logic spread spectrum, FH-MFSK radio receiver capable of demodulating and decoding one or more concurrently received L-length frequency-hopping, 2.sup.K -ary 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 modulates a particular user's L-length FH address signal with the derived frequency components to arrive at a 2.sup.K by L-length detection matrix. A majority logic decision circuit determines the level having the maximum number of derived frequency components along the L-length axis of the matrix, or which is the most likely level of multiple equal levels, and decodes the chosen 2.sup.K level into the indicated message signal.

REFERENCES:
patent: 3432619 (1969-03-01), Blasbalg
patent: 3916313 (1975-10-01), Lowry
patent: 4030033 (1977-06-01), Bibl et al.
patent: 4066964 (1978-01-01), Costanza et al.
27th IEEE Vehicular Conference Record: Mar. 16-18, 1977, "A Spread Spectrum Technique for High Capacity Mobile Communications", G. R. Cooper pp. 98-103.
28th IEEE Vehicular Tech. Conf. Record: Mar. 22-24, 1978, pp. 98-104.
4th Int. Conf. on Digital Satellite Comm.: Oct. 23-25, 1978, pp. 166-174.
1979 Ultrasonics Symposium Proceedings, Sep. 26-28, 1979, Paper E-1 by R. C. Williamson et al.

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