Pulse or digital communications – Repeaters – Testing
Patent
1990-10-30
1992-11-24
Cain, David
Pulse or digital communications
Repeaters
Testing
375120, 375102, H04B 1500
Patent
active
051669536
ABSTRACT:
A countermeasure to a partial-band follower jammer for frequency hopping spread spectrum communication systems employs an M-ary orthogonal frequency shift keyed (FSK) signaling system having q frequency channels available for hopping. During each signaling interval, the transmitter and receiver operate in either a conventional or unconventional mode. The conventional mode is selected by the transmitter and the receiver with a pseudorandom probability p.sub.c. In this mode, the transmitter transmits one of r tones within the corresponding hop (i.e., within one of q channels), and log.sub.2 r information bits are conveyed, while the receiver comprises a dehopper followed by noncoherent matched filters. The unconventional mode is selected with probability 1-p.sub.c. In this mode, the transmitter randomly chooses one of the r tones and transmits it in one of r channels within each hop, where the r channels are selected pseudorandomly. In the unconventional mode, log.sub.2 r information bits are transmitted and the receiver comprises a bank of r radiometers.
REFERENCES:
patent: 4972444 (1990-11-01), Melrose et al.
patent: 5056117 (1991-01-01), Gitlin et al.
Hassan Amer A.
Hershey John E.
Puckette Charles M.
Cain David
General Electric Company
Snyder Marvin
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