Title:
METHODS AND APPARATUS FOR BURST-MODE CDMA DSSS COMMUNICATIONS RECEIVING SYSTEMS
Document Type and Number:
WIPO Patent Application WO1998045961
Kind Code:
A9
Abstract:
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.
Inventors:
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
CHECK WILLIAM ALAN
CHISHOLM JOSEPH A
GLINSMAN BRIAN JAMES
KIM DAVID B
KRONZ RONALD L
DECKER DAVID G
KRASNER NORMAN F
Application Number:
PCT/US1998/007267
Publication Date:
April 22, 1999
Filing Date:
April 07, 1998
Export Citation:
Assignee:
GE CAPITAL SPACENET SERVICES I (US)
International Classes:
H04B1/707; H04W88/02; H04B1/709; (IPC1-7): H04B7/216
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