Orthogonal spread spectrum time division multiple accessing mobi

Details Orthogonal spread spectrum time division multiple accessing mobi Orthogonal spread spectrum time division multiple accessing mobi

1978-12-18

1981-11-17

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

370 19, 370103, H04J 1300

Patent

active

043015301

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.

REFERENCES:
patent: 3488445 (1970-01-01), Chang
patent: 3715508 (1973-02-01), Blasbalg
patent: 3908088 (1975-09-01), Gutleber
patent: 4056779 (1977-11-01), Toler
patent: 4117267 (1978-09-01), Haberle
patent: 4164628 (1979-08-01), Ward

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