Pseudo noise coded communication systems
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United States of America Patent
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Issued Date -
Dec 22, 2005
app pub date -
Jun 16, 2005
filing date -
Jun 17, 2004
priority date (Note) -
Abandoned
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Abstract
Systems, apparatus and methods for acquiring code phase and multipath channel models in communication device. A fast Walsh transform engine is used to acquire a pseudo noise code phase and the pseudo noise code bit rate of a radiofrequency signal that has been broadcast. Multipath filter coefficients from the ;pseudo noise code phase and the pseudo noise code bit rate are recovered. A pseudo noise generator is initialized with the pseudo noise code phase acquired during the fast Walsh transform step. The pseudo noise code phase and pseudo noise code bit rate are tracked by a phase locked loop so that communication with the radiofrequency signal is maintained. Then, the received noise code phase and pseudo noise code bit rate are despread so that any data in the radiofrequency signal is recovered.
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