Scrambled-communication system using adaptive transversal filter

Details Scrambled-communication system using adaptive transversal filter Scrambled-communication system using adaptive transversal filter

1989-06-26

1991-04-16

Buczinski, Stephen C.

Cryptography

Electric signal modification

Having production of printed copy

380 6, 380 9, 380 33, 380 40, 380 46, 36472416, H04K 102

Patent

active

050089374

ABSTRACT:
In a scrambled-communication system, a transmitting station generates a scrambling noise having a periodically-recurrent series of noise patterns and scrambles an information signal by simply summing the scrambling noise to the information signal, whereby the information signal is totally unintelligible by an interceptor. At a receiving station, a noise-cancelling signal is generated by an adaptive transversal filter and supplied to a subtractor where it is combined with the scrambled signal to recover the information signal. For generating the noise-cancelling signal, a descrambling noise identical to the scrambling noise is generated. The filter has a tapped-delay line for receiving the descrambling noise and a plurality of variable tap weights connected respectively to taps of the tapped-delay line. The outputs of the tap weights are summed to produce the noise-cancelling signal which corresponds to the scrambling noise if the tap weights are adjusted to optimum tap coefficients that are derived from the descrambling noise and from the output of the subtractor. The repetition frequency and noise pattern are the key for descrambling the scrambled signal.

REFERENCES:
patent: 3624562 (1971-11-01), Fujimura
patent: 4398062 (1983-08-01), McRae et al.

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