A comparative study of adaptive and non-adaptive IQ imbalance compensation methods in RX system

Different adaptive and non-adaptive compensation methods have been proposed in literature to compensate the problem of in phase and quadrature (IQ) imbalance in digital transmitter and receiver communication systems. In this paper, a comparative study is presented between an adaptive filtering compensation algorithm using the fast newton transversal filter algorithm combined with backward blind source separation (FB-FNTF) and a non-adaptive compensation method using the characteristics of I and Q signals in time domain, which have identical power and are uncorrelated. Their performance in terms of constellation diagram and symbol error rate (SER) are then evaluated for high-order quadrature modulation and high IQ imbalance values.