Pulse or digital communications – Repeaters – Testing
Patent
1996-06-24
1998-12-01
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
375208, 370342, 370344, H04B 1500, H04K 100, H04L 2730
Patent
active
058449345
ABSTRACT:
In 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 or otherwise desirable manner in a higher frequency range which may be as wide or as narrow a range as may be advantageous.
REFERENCES:
patent: 5177767 (1993-01-01), Kato
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5416797 (1995-05-01), Gilhousen et al.
patent: 5715236 (1993-11-01), Gilhousen et al.
Bayard Emmanuel
Pham Chi H.
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