Compensation of TX IQ Imbalance in Wideband OFDM Systems

In the beyond 5G/6G, the usage of the wideband transmission in the higher frequency band is expected. In this paper, we propose a method to compensate IQ imbalance caused by the path length differences between I and Q channels in the direct conversion transmitter in the wideband OFDM systems. In the proposed method, compensation signals are generated using the path length difference and the modulation symbols transmitted on the paired subcarriers which are known in the transmitter side. We analyzed the IQ imbalance and the proposed compensation method, then the effects of the proposed method are explained through the simulation.