A Novel Turbo Equalization for MIMO Frequency Selective Fading Channels

In this paper, we present a novel CRC-aided turbo equalization approach that exploits the cyclic redundancy check (CRC) to reduce computational complexity. The essential idea is that, during the iterative process, once a data block in the data frame is detected totally correct by CRC, we can set all the log likelihood ratio (LLR) of the bits in this block a fixed high value for the next iteration, and stop the corresponding computation about this block, hence decreasing computation in equalization and decoding. When LDPC is used as forward-error correction (FEC) codes, it is convenient to make use of the error detection capability of LDPC instead of CRC, avoiding extra overhead. Simulations show that the proposed CRC-aided turbo equalization achieves a performance equal to or even better than that of the conventional turbo equalization algorithm, but with a lower computational complexity