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A Turbo Processing MIMO System with Non-Linear MMSE Detector for High-Speed Wireless Communications  

Kang, Byeong-Gwon (Dept. of Information & Communication Engineering, Soonchunhyang University)
Cho, Dong-Kyun (Communication Research Center, Samsung Electronics)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.17, no.12, 2006 , pp. 1164-1171 More about this Journal
Abstract
In this paper, a simple and nonlinear MMSE detector is derived from the conventional linear MMSE detector to improve the system performance in turbo processing MIMO system and a new turbo processing MIMO system with nonlinear MMSE detector and Gaussian approximation is proposed. In turbo coded turbo processing MIMO system, the proposed system of M=N=4 performs about 0.5 dB better than the conventional system and the proposed system of M=N=8 performs about 0.4 dB better than conventional system at 1 % FER. In addition, the average number of outer iterations of proposed system shows lower than that of conventional system. This is caused by the fact that the nonlinear MMSE detector of proposed system decides soft-outputs of coded bits based on the observation of received signals, so that it can reduce the uncertainty region in estimating the coded bits.
Keywords
Turbo Process; MIMO; Nonlinear MMSE; Soft Decision; Rayleigh Fading;
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