System for detecting short codes
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United States of America Patent
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Jun 1, 2004
Grant Date -
Dec 5, 2002
app pub date -
Jul 1, 2002
filing date -
Oct 8, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A system employing CDMA techniques for receiving a transmitted signal wherein the transmitted signal includes a plurality of short codes, each of which is transmitted repetitively over a fixed period of time and where the received signal has CW interference in addition to the transmitted signal. The system detects the presence of the short code in a plurality of time phases of the received signal by calculating a likelihood ratio for each phase. The likelihood ratio takes into account the current short code.
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