Orthogonal spread spectrum time division multiple accessing mobile subscriber access system
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United States of America Patent
Stats
-
Nov 17, 1981
Grant Date -
N/A
app pub date -
Dec 18, 1978
filing date -
Dec 18, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A time division multiple access mobile communications system employing frency division multiplexing and perfect noise codes to enable utilization of the system. A central node, or repeater, is employed, with all transmissions to it being performed at a first frequency, and with the frequency division multiplexing being such that all re-transmissions from the central node are performed at a second, different frequency. The noise codes employed are of a type termed code mates having correlation functions which upon detection provide an impulse autocorrelation function. The described arrangement enables random access, or direct call-up, to be accomplished with total non-interference between users. Large improvements in signal-to-noise power ratio and in signal-to-jamming power ratio will be seen to result.
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