Performance analysis of different equalization algorithms in a modified iterative scheme

This paper proposes a modified iterative scheme (MI) for the data transmitted by more efficient way over inter-symbol interference (ISI) channels, then compares and analyzes the performance for three equalization algorithms in MI: improved MAX-Log-MAP (I-MLM) algorithm, maximum a posteriori (MAP) algorithm and linear minimum mean-squared error (LMMSE) algorithm. First we analyze and compare these three algorithms in traditional turbo equalization (TE) scheme. Second, according to the good understanding of the aforementioned algorithms and the novel iterative (NI) scheme which combines parallel with serial concatenation turbo-like scheme, we propose the MI scheme and compare the performance of three algorithms in MI, named as MI-I-MLM, MI-MAP and MI-LMMSE respectively. Both analytical and simulation results demonstrate that the performance of MI-I-MLM is very close to MI-MAP and much better than MI-LMMSE while its computational complexity is much lower.