Patent ID: 7602861

Claim:
In a wireless receiver that processes a digital signal having an in-phase (I) signal component including a first, actual DC Offset Component (DCOC) and a quadrature-phase (Q) signal component including a second, actual DCOC, a method of generating a baseband signal comprising: receiving the digital signal and removing a portion of the DCOC with a hardware (HW) block to produce a residual DCOC centered at DC, and generating first and second parameters that estimate the residual DCOC, wherein the receiving step performed by the HW block further includes, generating the first parameters with the I signal component, wherein the first parameters comprise a first residual DCOC estimate centered at DC and a first residual DCOC, wherein the first residual DCOC estimate centered at DC comprises a first estimated DCOC value equal to a sum of first residual DCOCs accumulated during an accumulation period, and the first residual DCOC equals the first estimated DCOC value subtracted from the first, actual DCOC, and generating the second parameters with the Q signal component, wherein the second parameters comprise a second residual DCOC estimate centered at DC and a second residual DCOC, wherein the second residual DCOC estimate centered at DC comprises a second estimated DCOC value equal to a sum of second residual DCOCs accumulated during the accumulation period, and the second residual DCOC equals the second estimated DCOC value subtracted from second, actual DCOC; converting the residual DCOC centered at DC to a residual DCOC centered at intermediate frequency (IF) with a converter block, wherein the converting step performed by the converter block further includes the steps of, up converting the first and second residual DCOC centered at DC to a first baseband signal with a complex mixer, attenuating the first baseband signal by an attenuation factor K to generate an attenuated baseband signal with an anti-alias filter, and down sampling the attenuated baseband signal by a predetermined factor to generate a second, down converted baseband signal including the residual DCOC centered at IF with a down sampler; and eliminating the residual DCOC using the first and second parameters, with a digital signal processor, and generating a baseband signal that is substantially free of the DCOC.