Patent ID: 7809083

Claim:
A differential receiver comprising: an antenna to receive a radio frequency signal, the radio frequency signal encoding a digital data payload; a converter 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 to respectively convert the analog in-phase signal and the analog quadrature phase signal into a digital in-phase signal and a digital quadrature phase signal; a detector 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 to extract a phase based on the demodulated phase shift keying (PSK) signal; a frequency offset estimation module to, in the phase domain, acquire an estimate of frequency offset contained in the demodulated phase shift keying (PSK) signal based on the phase extracted from the demodulated phase shift keying (PSK) signal; and a first frequency offset compensation module configured to compensate, in the phase domain, for the frequency offset contained in the demodulated phase shift keying (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 phase shift keying (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.