Patent ID: 8139688

Claim:
A differential receiver comprising: a converter configured to down-convert the radio frequency signal to a baseband signal, and extract each of (i) an analog in-phase signal and (ii) an analog quadrature phase signal from the baseband signal; an analog-to-digital converter configured to (i) convert the analog in-phase signal into a digital in-phase signal and (ii) convert the analog quadrature phase signal into a digital quadrature phase signal; a detector configured to obtain a demodulated phase shift keying (PSK) signal based on each of the digital in-phase signal and the digital quadrature phase signal; a phase extractor configured to extract a phase based on the demodulated PSK signal; a frequency offset estimation module configured to, in the phase domain, acquire an estimate of frequency offset contained in the demodulated PSK signal based on the phase extracted from the demodulated PSK signal; a first frequency offset compensation module configured to compensate, in the phase domain, for the frequency offset contained in the demodulated PSK signal based on the estimate of frequency offset acquired by the frequency offset estimation module; a second frequency offset compensation module configured to compensate, in the time domain, for the frequency offset contained in the demodulated PSK signal based on the estimate of the frequency offset acquired by the frequency offset estimation module; and a programmable selector to provide the estimate of the frequency offset acquired by the frequency offset estimation module to either (i) the first frequency offset compensation module or (ii) the second frequency offset compensation module.