A Novel Technique for I/Q Imbalance and CFO Compensation in OFDM Systems

Abstract

In this paper, a novel baseband IQ estimation and compensation technique is proposed to overcome the joint effects of CFO (carrier frequency offset) and IQ imbalance. The proposed method uses a one-shot algorithm which is able to estimate and compensate the non-ideal effect up to a gain error of 1 dB, phase error of 10/spl deg/, and CFO of 50 ppm at a carrier frequency of 2.5 GHz in 64QAM OFDM systems. Under this condition, the system performance has less than 0.8 dB design loss in terms of PER and is shown to have more than 10 dB improvement compared with the reference design.