CORRELATOR METHOD AND APPARATUS

WIPO Patent Application WO1998045961

A3

A method and apparatus for receiving and processing burst-mode code-division multiple access (CDMA) direct-sequence spread-spectrum (DSSS) signals is provided. In this apparatus and method, a number of demodulators are provided in a set enumerated order. Each demodulator is either "ready," meaning that it is free to process signals, or busy meaning that it is currently processing a signal. The ready demodulators each receive an input IF signal and try to detect a preamble in the IF signal. Once they detect the preamble, each ready demodulator then sends a request signal to an arbitrator. In response to a received request signal, the arbitrator sends a grant signal to the first ready demodulator in the enumerated order. This grant signal passes through each busy demodulator that is higher in the enumerated order than the first ready demodulator. The first ready demodulator then begins processing the signal, and is moved from the set of ready demodulators to the set of busy demodulators. The remaining ready demodulators then continue processing incoming signals. When a busy demodulator completes processing a signal, it is returned to the set of ready demodulators.

FLEMING ROBERT FLEMING III
CHECK WILLIAM ALAN
CHISHOLM JOSEPH A
GLINSMAN BRIAN JAMES
KIM DAVID B
KRONZ RONALD L
DECKER DAVID G
KRASNER NORMAN F

PCT/US1998/007267

March 11, 1999

April 07, 1998

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GEN ELECTRIC (US)

H04B1/707; H04W88/02; H04B1/709; (IPC1-7): H04B1/707

US5490165A	1996-02-06
US5608722A	1997-03-04

ABRAMSON N: "FUNDAMENTALS OF PACKET MULTIPLE ACCESS FOR SATELLITE NETWORKS", IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, vol. 10, no. 2, 1 February 1992 (1992-02-01), pages 309 - 316, XP000272917

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