Communication device

Details Communication device Communication device

2007-11-13

2007-11-13

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

Interference or noise reduction

C375S238000, C375S239000, C375S242000, C375S256000, C375S257000, C375S286000, C375S353000, C307S402000, C329S300000, C329S304000, C341S126000, C455S130000, C455S296000

Reexamination Certificate

active

10715222

ABSTRACT:
A direct sequence spread spectrum (DSSS) receiver (100) consistent with certain embodiments has a frequency generator (112) that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter (108) receives the local oscillator signal and mixes the local oscillator signal with a received DSSS signal to produce a down-converted signal. The received DSSS signal is encoded using a first set of DSSS code. A differential chip detector (116) receives the down-converted signal and converts the down-converted signal to a differentially detected signal. A correlator (120) receives the differentially detected signal and correlates the detected signal with a set of DSSS codes that are time-shifted from the first set of DSSS codes. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

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