Frequency Domain IQ Correction in a Direct conversion Receiver for DVB-T

Abstract

This paper describes a novel scheme for correcting IQ imbalance errors in a direct-conversion receiver intended for terrestrial digital video broadcasting (DVB-T). Accurate estimation and correction of IQ errors can be achieved in the frequency domain with the aid of the pilot carriers present in a DVB-T signal. It is shown that relatively large IQ imbalance errors, likely to be encountered in an integrated receiver, can be effectively compensated using the proposed method. Simulations carried out using an end-to-end DVB-T model provide promising results. For example, it is shown through simulations that even larger IQ imbalance errors could be compensated effectively achieving a bit error rate less than the value recommended by the DVB-T standard, which is 2times10-4 at an SNR of around 16.5 dB