Measurement of baseband timing in a spread spectrum...

Details Measurement of baseband timing in a spread spectrum... Measurement of baseband timing in a spread spectrum...

2011-08-30

2011-08-30

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S355000, C375S358000

Reexamination Certificate

active

08009723

ABSTRACT:
Systems, apparatuses, and methods for providing timing estimates of received signals are disclosed. In one embodiment, sub-chip timing in spread spectrum signals can be achieved without requiring oversampling in the receiver. A transmitter can adjust the timing of certain transmitted symbols by a fraction of a chip time from an expected time, and send the mistimed symbols to a receiver. The output of the receiver's de-spreading correlator can show different magnitudes for wedge symbols with different timing errors. By setting some symbols early and some late, and by taking the difference between their magnitudes, a transfer function between the result and a timing error can be determined.

REFERENCES:
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patent: 6650718 (2003-11-01), Fujimura et al.
patent: 7079523 (2006-07-01), Nelson et al.
patent: 7092467 (2006-08-01), Lee et al.
patent: 2002/0150181 (2002-10-01), Sayeed
patent: 2003/0186666 (2003-10-01), Sindhushayana
patent: 2005/0253742 (2005-11-01), Soga

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