Digital transmission system

Details Digital transmission system Digital transmission system

1984-06-27

1986-11-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 19, 375100, 371 69, H04L 108

Patent

active

046213686

ABSTRACT:
Fast and deep fading tends to occur in the communication between a fixed base station and a mobile station which is carried on an automobile travelling in an urban area. When connection control signals or other digital code pattern need to be transmitted between the mobile station and the fixed station, it is necessary to provide a protection system against fading. This invention relates to a protection system of the type wherein a transmitter repeats identical information for plural times and by inverting polarity. The bit error rate against fading will be thus improved and moreover, even if there is a deviation in the pattern arrangement of codes, the DC component unbalance may be avoided. The receiver evaluates the receiving condition and receives selectively the identical information which has been repeatedly transmitted. The invention provides plural circuit systems which are effective for evaluation and selection.

REFERENCES:
patent: 3344353 (1967-09-01), Wilcox
patent: 3781794 (1973-12-01), Morris
patent: 4253185 (1981-02-01), Danielson

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