IQ Cross-talk Compensation in Fading Channels

This paper discusses IQ cross-talk estimation and compensation in direct-conversion receivers for terrestrial digital video broadcasting (DVB-T). The IQ cross-talk is estimated using the pilots in the frequency domain while the effects of IQ cross-talk are cancelled in time domain. First, IQ cross-talk estimation and cancellation techniques are explained for additive white Gaussian channels. Then the implications of the presence of multi-path fading channels are analyzed. Finally, the effectiveness of the IQ imbalance compensation techniques is evaluated using an end-to-end DVB-T model