Pulse interference cancelling system for spread spectrum signals

Details Pulse interference cancelling system for spread spectrum signals Pulse interference cancelling system for spread spectrum signals

1982-10-15

1984-10-02

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 96, 375102, 370 18, H04B 110, H04J 1300

Patent

active

044752156

ABSTRACT:
A pulse interference cancelling system for spread spectrum signals utilized in a digital noise coded communications system. The system includes a first and second noise coded signal channel located in a noise coded signal receiver which also includes a demultiplexer for providing a pair of received noise coded signals which were initially generated, multiplexed and transmitted to the receiver. First and second coherent detector means are coupled to both signal channels, the first being directly coupled thereto so that no signal delay exists but the second is coupled to the two signal channels by means of respective first and second variable time delay circuits having a delay substantially equal to the bit width of each digital code as well as a vernier delay which is adapted to delay the phase of any received pulse interference in the respective channel so that it is exactly 180.degree. out of phase with the same undelayed pulse interference. Signal summing means are coupled to the outputs of the two coherent detectors which operate to completely cancel the interference pulse signal while leaving the desired noise coded signal at its peak amplitude.

REFERENCES:
patent: 3870996 (1975-03-01), Miller
patent: 4293953 (1981-10-01), Gutleber
patent: 4325068 (1982-04-01), Mercer
Weik, Martin H., Communications Standard Dictionary, Van Nostrand Reinhold ompany, 1983, pp. 56, 200.

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