Sample timing control for demodulation of phase-modulated...

Details Sample timing control for demodulation of phase-modulated... Sample timing control for demodulation of phase-modulated...

H - Electricity

04

L

H04L 27/22 (2006.01) H04L 7/033 (2006.01)

Patent

CA 2310368

A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase- modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

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