Spread spectrum communication system

Details Spread spectrum communication system Spread spectrum communication system

1998-05-12

2000-05-16

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375206, 375208, 370342, H04B 169

Patent

active

06064690&

ABSTRACT:
A spread spectrum communication system wherein spreading codes for in-phase and quadrature components are composed by addition and subtraction and the received signal is multiplied by these composed codes for despreading. The communication system comprises a transmitter generating in-phase and quadrature components. The transmitter includes a spreading circuit for spreading the in-phase and quadrature components. The system further includes a receiver, a phase correction circuit for correcting the phase of despreaded components, a rake combiner for combining the components corrected by the phase correction circuit and a circuit for outputting a combined signal and a delay detection circuit for delaying detection of the combined signal. The receiver also comprises a provisional judgment portion for judging the phase of a pair of the in-phase and quadrature phase components. The phase correction circuit corrects the phase according to the phase judged by the provisional judgment portion.

REFERENCES:
patent: 4538281 (1985-08-01), Rajan
patent: 5068872 (1991-11-01), Schroter
patent: 5305349 (1994-04-01), Dent
patent: 5761239 (1998-06-01), Gold et al.
patent: 5892774 (1999-04-01), Zehavi et al.

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