Low probability of intercept communication system

Details Low probability of intercept communication system Low probability of intercept communication system

1990-01-24

1991-07-02

Buczinski, Stephen C.

Pulse or digital communications

Repeaters

Testing

375 10, 380 2, 380 34, H04L 2730

Patent

active

050291840

ABSTRACT:
A low probability of intercept communication system (CCSK)--modulates information signals onto an inverse fast Fourier transformation of a large number of simultaneous frequencies that have been determined to be reasonably `quiet` within a given system bandwidth, so as to produce a time domain pulse waveform. The amplitude of each transmitted frequency is weighted. Within the receiver equipment of each participant in the system, the incoming pulse waveform produced by the inverse fast Fourier transformation mechanism at the source is coupled to a fast Fourier transform operator, so as to separate the time domain signal into a plurality of frequency components that contain the modulated data. These components are then convolved with a replica of the plurality of quiet channels to derive a time domain output waveform from which the data modulation can be identified and recovered. Even if a jamming threat is injected into one or more of the `quiet` channels that has been selected as a participating carrier, by virtue of the signal analysis and recovery process employed by each unit for incoming signals, jamming spikes are effectively excised.

REFERENCES:
patent: 3605018 (1971-09-01), Coviello
patent: 4393276 (1983-07-01), Steele
patent: 4608647 (1986-08-01), White et al.
patent: 4623980 (1986-11-01), Vary
patent: 4879726 (1989-11-01), Kobayashi et al.
patent: 4933954 (1990-06-01), Petry

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