Turbo Receiver Design with Carrier-Frequency Offset Estimation for LDPC-Coded MIMO OFDM Systems

This paper proposes an iterative maximum a posteriori probability (MAP) receiver for low-density parity-check (LDPC)-coded multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with the presence of carrier-frequency offset (CFO). The turbo receiver employs the expectation maximization (EM) algorithm so as to improve the performance of the approximated MAP detection, and applies a pilot-aided CFO estimator which can work well with the EM algorithm. Simulation results show the effectiveness of our turbo receiver design in combating CFO over unknown frequency selective fading channels.