4-ary correlator, matched filter, and decoder for coherent, dire

Details 4-ary correlator, matched filter, and decoder for coherent, dire 4-ary correlator, matched filter, and decoder for coherent, dire

1991-07-09

1993-04-20

Swann, Tod

Pulse or digital communications

Repeaters

Testing

380 34, 370 18, H04K 100

Patent

active

052048756

ABSTRACT:
A system for decoding an IF signal modulated with 4-ary words generated at a known spreading rate (PN code) comprises a receiver in which four known 4-ary words are generated at the same rate. The system then compares the incoming signals modulated with unknown 4-ary words with each of four known 4-ary words. Only one of the known words will be in phase with a received unknown word. The disclosure describes a system which determines which of the four words is in phase, this being the determinant of the identity of the unknown word.

REFERENCES:
patent: 3478268 (1969-11-01), Coviello
patent: 3916313 (1975-10-01), Lowry
patent: 4017798 (1977-04-01), Gordy et al.
patent: 4635221 (1987-01-01), Kerr
patent: 4691326 (1987-09-01), Tsuchiya
patent: 4866734 (1989-09-01), Akazawa et al.
patent: 4933952 (1990-06-01), Albrieux et al.
patent: 4943975 (1990-07-01), Kurihara et al.

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