Patent ID: 8218686

Claim:
An apparatus comprising: front end circuitry to demodulate a radio frequency signal and produce a baseband signal, the radio frequency signal comprising a periodic signal with a predetermined period; an analog-to-digital converter to convert the baseband signal into a digital signal, the digital signal comprising a periodic signal with the predetermined period; a first DC offset adjustment circuit including a filter, the filter to estimate a DC offset contained in the digital signal based only on digital samples in a sample period having a length equal to the predetermined period; a second DC offset adjustment circuit to estimate the DC offset contained in the digital signal; and a multiplexer to select whether the first DC offset adjustment circuit or the second DC offset adjustment circuit is to be used to estimate the DC offset contained in the digital signal, wherein the first DC offset adjustment circuit is selected during packet reception and the second DC offset adjustment circuit is selected during interpacket reception; and an adder to remove the selected estimated DC offset, output from the multiplexer, from the digital signal.