Simple and Accurate Design of Low-Density Parity-Check Codes for Multi-Input Multi-Output Systems

Authors:
Jeong Hwan Shin;Kwangseok Noh;Wonjin Sung;Jun Heo
Affiliations:
School of Electrical Engineering, Korea University, Seoul, Korea;School of Electrical Engineering, Korea University, Seoul, Korea;Department of Electronic Engineering, Sogang University, Seoul, Korea;School of Electrical Engineering, Korea University, Seoul, Korea
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

In this paper we design an irregular low-density parity-check (LDPC) code for multiple-input multiple-output (MIMO) systems, using a simple extrinsic information transfer (EXIT) chart method. The MIMO systems considered are the optimal maximum a posteriori probability (MAP) detector and the suboptimal minimum mean square error soft-interference cancellation (MMSE-SIC) detector. The MIMO detector and the LDPC decoder exchange soft information and form a turbo iterative receiver. The EXIT charts are used to obtain the edge degree distribution of the irregular LDPC code which is optimized for the MIMO detector. It is shown that the performance of the designed LDPC code is better than that of conventional LDPC code which was optimized for either the Additive White Gaussian Noise (AWGN) channel or the MIMO channel without an explicit consideration of the given detector structure.