Time–Frequency Multiplex Transceiver Design with RX IQ Imbalance, CFO, and Multipath Channel Estimation and Compensation for Multicarrier Systems

Abstract

The low complexity time---frequency multiplex estimator and equalizer transceiver design are proposed to combat the RF impairment problems for the zero-IF transceiver of multi-carrier systems. Moreover, the proposed preamble can estimate and compensate the receiver (Rx) in-phase and quadrature-phase (IQ) imbalance, carrier frequency offset (CFO), and channel impulse response parameters. There are two parts in the proposed system. Firstly, all parameters of impairments are estimated by the proposed time---frequency multiplex estimator design with the iterative cancellation scheme. Secondly, the iterative group pair equalizer with the estimated parameters is proposed to eliminate the RF impairments effect and detect the transmitted signal with low complexity advantage. Simulation results confirm that the proposed estimator can provide the reliable performance over the severe IQ imbalance, CFO, and multipath fading channel environments.