Secure communication system

Details Secure communication system Secure communication system

1977-10-20

1980-02-12

Birmiel, Howard A.

Telegraphy

Systems

Printing

179 15R, 325 58, 325 65, 178 691, H04K 100

Patent

active

041885805

ABSTRACT:
A secure communication system for transmitting and receiving an encoded information signal. The system generates at transmitting and receiving locations a predetermined unique pseudorandom code. A synchronized tracking signal is imposed on the information to be transmitted and added to the information to form an intermediate signal. The pseudorandom code is then multiplied by the intermediate signal directly so that the ultimate result appears to assume the character of pseudorandom noise, which is then transmitted to the receiving location. The synchronization and transmitted encoded portion is decoded at the receiver and used to generate a base signal for a pseudorandom generator at the receiving location, as well as initiate initial clocking pulse time for operation of the receiver pseudorandom generator. The receiver then generates the predetermined pseudorandom code and divides the same against the encoded signal being received to form an intermediate signal having no pseudorandom signal component, which is then filtered to remove the tracking and masking signal and thereby generating the original information signal desired.

REFERENCES:
patent: 3610828 (1971-10-01), Girard
patent: 3614316 (1971-10-01), Andrews, Jr. et al.
patent: 3624297 (1971-11-01), Chapman
patent: 3659046 (1972-04-01), Angeleri et al.
patent: 3694757 (1972-09-01), Hanna, Jr.
patent: 3706933 (1972-12-01), Bidell et al.
patent: 3723878 (1973-03-01), Miller
patent: 3808536 (1974-04-01), Reynolds
patent: 3893031 (1975-07-01), Majeau et al.
patent: 3909534 (1975-09-01), Majeau et al.
patent: 4013837 (1977-03-01), Bianscome et al.
R. C. Dixon, Spread Spectrum Systems, New York, John Wiley and Sons, 1976, Chapters 1 and 2, et seq.
R. C. Dixon, Why Spread Spectrum, IEEE Communications Society, vol. 13, No. 4.

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