Multiplex communications – Communication over free space – Repeater
Patent
1996-03-25
1998-06-09
Safourek, Benedict V.
Multiplex communications
Communication over free space
Repeater
370335, 375208, 375344, H04B 7216
Patent
active
057646309
ABSTRACT:
A spread spectrum CDMA communication system in which a base station communicates with a plurality of subscriber terminals and the base signal transmitted by the base station is comprised of a set of substantially orthogonal functions which are overlaid with a pseudo-noise (PN) sequence forming a coded spreading sequence for an information signal, each orthogonal function of the set carries data for a single user in the system. Information signals are modulated onto the carrier to form a transmit signal and the coded spreading sequence on the transmit signal for broadcasting, each subscriber terminal having a receiver for coherently demodulating the base station signal. A plurality of correlators, each respectively tuned to different functions of the orthogonal signal set, are each followed by an appropriate nonlinearity for removing the data modulation. The summed output of the correlators is used to improve the estimate of carrier phase over that obtained with a single correlator.
REFERENCES:
patent: 5414728 (1995-05-01), Zehavi
patent: 5566164 (1996-10-01), Ohlson
patent: 5579338 (1996-11-01), Kojima
Natali Francis D.
Ohlson John
Safourek Benedict V.
Stanford Telecommunications, Inc.
Zegeer, Esq. Jim
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