Impacts Of I/q Imbalance On Qpsk-ofdm-qam Detection

The impacts of IIQ imbalances in the quadrature down-converter on the performance of an QPSK-OFDM-QAM system are studied. It is shown that both amplitude and phase imbalances cause inter-channel interference; they jointly cause IIQ cross-talk in each and every sub-carriers. The BER (Bit Error Ratio) performances of the QPSK sub-carriers are calculated to illustrate the impacts of I/Q imbalances.