Correlation for synchronizing to long number sequences in communications systems
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United States of America Patent
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Jun 25, 2002
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app pub date -
Nov 5, 1998
filing date -
Nov 5, 1998
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Abstract
A correlation arrangement comprises 2.sup.k correlators each for correlating a sub-block of k symbols of a sequence derived from a received signal of a wireless communications system with all 2.sup.k possible sequences of k binary symbols to produce a respective one of 2.sup.k correlator outputs. For PN (pseudo random noise) synchronization, for each of N candidate PN sequences, a sub-block of k binary symbols of the respective candidate PN sequence is used to select a respective one of the 2.sup.k correlator outputs as a correlation output for the sub-block, and the selected sub-block correlation outputs are accumulated for m sub-blocks to produce a correlation result for a correlation block of mk symbols. A maximum one of the N correlation results is detected and the candidate PN sequence providing this maximum is identified for PN synchronization. N, k, and m are integers. The arrangement reduces computation for large values of N and large correlation blocks.
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