Circuit and method for phase error correction in a digital...

Details Circuit and method for phase error correction in a digital... Circuit and method for phase error correction in a digital...

H - Electricity

04

B

H04B 1/16 (2006.01) H04H 5/00 (2006.01)

Patent

CA 2072709

A CIRCUIT AND METHOD FOR PHASE ERROR CORRECTION IN A DIGITAL RECEIVER Abstract of the Disclosure A digital receiver, such as "C-QUAM" receiver (10), has phase error correction. In another form, a software program may be executed by a conventional digital signal processor to also implement phase error correction. A digital input signal is demodulated to form an in-phase and a quadrature component. The in-phase and quadrature components are processed by a digital envelope detector (24) to form a composite signal containing left and right audio channel information. The in-phase component and composite signal are both processed by a reciprocal cosine estimator (28) and a quadrature channel circuit (38) to provide a difference signal also containing left and right audio channel information. The difference signal is input to phase error correction circuitry (16, 22, 26) to estimate a phase error of the digital input signal. The estimated phase error is then used to correct an actual phase error of the digital input signal during demodulation.

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