Spreading code acquisition for direct sequence spread spectrum signals
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United States of America Patent
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Oct 30, 2012
Grant Date -
Nov 18, 2010
app pub date -
May 13, 2010
filing date -
May 13, 2009
priority date (Note) -
Expired
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Abstract
The invention relates to a method and apparatus for acquiring a complex spreading code of a direct sequence spread spectrum signal (DSSS) by acquiring a state of a spreading code generator capable of generating the complex spreading code. A sequence of bipolar differential product values, which sign is independent on data transmitted by the DSSS signal, is obtained by combining in-phase and quadrature samples of the DSSS signal for adjacent chip intervals. This sequence is provided to a linear block decoder for obtaining a codeword of a linear block code, which is defined by a structure of the spreading generator and the differential product operation. The codeword is used to compute the state of the spreading code generator.
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