System and method for extracting soft symbols in direct sequence spread spectrum communications
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United States of America Patent
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Aug 3, 2004
Grant Date -
N/A
app pub date -
Sep 15, 2000
filing date -
Sep 15, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
An integrated circuit including a demodulating finger is provided for variably extracting symbols in the demodulation process of spread spectrum signals. Following the uncovering of an information channel sample stream, partial I and Q accumulations are supplied at a rate of one partial I and Q accumulation per four PN chips. A dot product operation is then performed upon these partial I and Q accumulations using a pilot estimate, and the resulting partial symbols are accumulated in a second process, where the soft symbols can be selectively supplied with a symbol period in the range from 4 to 2048 PN chips. In this manner, the symbol accumulation process can be made to work with a wide variety of information channel symbol rates. A method for partially accumulating soft symbols, both before and after the dot product operation, is also provided.
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