Patent ID: 8279955
Filing Date: 2012-10-02
Classification: H04L

Abstract:
1. A DC calibration circuit for a receiver, the DC calibration circuit being configured to receive a digital multi-carrier modulated (MCM) signal that includes a sequence of MCM symbols, the DC calibration circuit comprising: an accumulator to determine an estimated DC offset of a first MCM symbol in the sequence of MCM symbols, wherein the accumulator receives a plurality of digital samples that comprise the first MCM symbol and determines the estimated DC offset by calculating an average of the plurality of digital samples, wherein the accumulator comprises: a compensator to remove the estimated DC offset from a second MCM symbol in the sequence of MCM symbols; a first timer switch configured to pass the digital MCM signal to the accumulator while the first MCM symbol is received by the DC calibration circuit; and a second timer switch configured to pass the estimated DC offset from the accumulator to the compensator, such that the estimated DC offset is applied to the digital MCM signal by the compensator while the second MCM symbol is received by the DC calibration circuit.