MSE Comparison of Reduced-Rank Equalizers for Iterative Multi-User Receivers Based on EXIT Charts

摘要

The use of the EXtrinsic Information Transfer (EXIT) chart for the analysis of iterative decoding schemes allows to discuss the convergence properties of concatenated (turbo) codes. Applied to iterative equalization, the EXIT chart can be used to evaluate the performance of the optimal linear equalizer (the Wiener filter) and its reduced-rank versions for different channel realizations. In this paper, we present a method to calculate the detector curve of the EXIT chart instead of obtaining it by simulating the transmission of bits over a channel. Furthermore, the presented method reveals the possibility of estimating the average Mean Square Error (MSE) at different iteration stages of a turbo detection system.