Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1993-12-28

1996-07-02

Cain, David C.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 110

Patent

active

055330460

ABSTRACT:
In a one embodiment of a spread spectrum communication system, an unmodulated synchronization wavetrain and one or more modulated intelligence wavetrains are generated in timed relation and are concurrently propagated but separately detected in a receiver. In another embodiment, wavetrains are modulated by opposite phases of an intelligence signal and so detected in a receiver as to produce a synchronization control signal and an intelligence signal by summing and comparing two received signals. Under microprocessor control, the phase of operation of the sequence generators of the receiver is adjusted to obtain phase and frequency information for effecting phase control for synchronization and also to controllably swallow cycles and accurately adjust the effective frequency of the clock signal. Each sequence generator includes a memory which stores data to control one counter and to define the durations and order of variations of a sequence, the memory being indexed by a second counter at the end of each sequence. The wavetrains may be transmitted on at least one carrier and preferably on a plurality of carriers of different frequencies to transmit energy in a generally uniformly distributed manner in a higher frequency range which may be as wide a range as may be advantageous.

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