A BLOCK ADAPTIVE FREQUENCY DOMAIN MIMO DFE FOR WIDEBAND CHANNELS

Abstract — The equalization of MIMO frequency selective channels is a challenging task due to the increased �lter lengths required and the presence of interstream interference. In wideband systems where high delay spread channels arise and long transmission bursts are employed, adaptive equalization is necessary. In this work, we develop an adaptive MIMO DFE for wideband time varying systems. To reduce computational complexity and accelerate convergence rate, the equalizer is fully implemented in the frequency domain, while an inherent causality problem is ef�ciently solved through an iterative scheme. As veri�ed by simulations, the proposed method offers a good trade off in terms of complexity and convergence, compared to other related adaptive algorithms. Index Terms — MIMO systems, Adaptive equalizers. I