Simplified Joint Iterative Detection and Decoding in BICM MIMO-OFDM Systems

Joint iterative detection and decoding scheme is exploited for a bit interleaved coded modulation (BICM) multiple-input multiple-output (MIMO) Orthogonal-Frequency Division Multiplexing (OFDM) system. A simplified channel estimation utilizing channel frequency-domain correlation is used to decrease FFT order and provide channel state information for the demapper. An improved list sphere-decoding (ILSD) SISO demapper without the requirement of initial radius is also adopted. The computation complexity of ILSD can be further reduced by the simplified channel estimation method. Simulations show that the BICM MIMO-OFDM scheme is robust to the timing-vary frequency selective fading channels. Performance degradation caused by simplification can be compensated by increasing the iterative number of the receiver.