Factor Graph Based Detection and Channel Estimation for MIMO-OFDM Systems in Doubly Selective Channel
Based on the factor graph, a joint channel estimation and detection method is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems employing multiple transmit and receive antennas (MIMO). Using belief propagation, statistics of the fast varying MIMO multipath channel are utilized in estimating channel coefficients. By proper message scheduling and passing, the proposed receiver is effective for MIMO-OFDM system in fast fading frequency-selective channel. High data-rate wireless communication is demanded by many applications. Novel techniques such as MIMO and OFDM are promising choice of future high data rate systems.