Shared correlator system and method for direct-sequence CDMA demodulation
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United States of America Patent
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Oct 22, 2002
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app pub date -
Oct 14, 1998
filing date -
Oct 14, 1998
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Abstract
A shared correlator system and method for a code division, multiple access (CDMA) receiver employs pipeline processing and information tags for sharing vector generation and correlation operations between processing units. A signal input to the CDMA receiver is provided as, for example, In-phase channel (I) and quadrature-phase channel (Q) sample vectors I.sub.REC and Q.sub.REC. Sample vectors I.sub.REC and Q.sub.REC are applied to the shared correlator of the CDMA receiver. Processing units request correlation operations by the shared correlator in which matched filter pseudo-noise (PN) vectors are correlated with the I and Q sample vectors I.sub.REC and Q.sub.REC. The shared correlator schedules correlation operations requested by processing units, generates matched-filter, PN vectors with associated identification tags for the correlation operations, and provides correlation results for the correlation operations. The shared correlator renders a shared task correlation system, and includes pipeline processing and identification tags to increase correlation bandwidth and facilitate result distribution to shared tasks.
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