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EXIT Chart Based Design of Irregular LDPC Codes for Large-MIMO Systems

Narasimhan, Lakshmi T and Chockalingam, A (2013) EXIT Chart Based Design of Irregular LDPC Codes for Large-MIMO Systems. In: IEEE COMMUNICATIONS LETTERS, 17 (1). pp. 115-118.

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Official URL: http://dx.doi.org/10.1109/LCOMM.2012.112812.122249


In this letter, we characterize the extrinsic information transfer (EXIT) behavior of a factor graph based message passing algorithm for detection in large multiple-input multiple-output (MIMO) systems with tens to hundreds of antennas. The EXIT curves of a joint detection-decoding receiver are obtained for low density parity check (LDPC) codes of given degree distributions. From the obtained EXIT curves, an optimization of the LDPC code degree profiles is carried out to design irregular LDPC codes matched to the large-MIMO channel and joint message passing receiver. With low complexity joint detection-decoding, these codes are shown to perform better than off-the-shelf irregular codes in the literature by about 1 to 1.5 dB at a coded BER of 10(-5) in 16 x 16, 64 x 64 and 256 x 256 MIMO systems.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, USA
Keywords: Large-MIMO systems;EXIT chart;degree profile optimization;message passing;joint detection-decoding
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 09 Mar 2013 07:15
Last Modified: 09 Mar 2013 07:15
URI: http://eprints.iisc.ac.in/id/eprint/46003

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