Near-capacity iterative decoding of binary self-concatenated codes using soft decision demapping and 3-D EXIT charts

Authors:
Muhammad Fasih Uddin Butt;Raja Ali Riaz;Soon Xin Ng;Lajos Hanzo
Affiliations:
School of Electronics and Computer Science, University of Southampton, Southampton, UK and Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad, Pakistan;School of Electronics and Computer Science, University of Southampton, Southampton, UK and Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad, Pakistan;School of Electronics and Computer Science, University of Southampton, Southampton, UK;School of Electronics and Computer Science, University of Southampton, Southampton, UK
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

In this paper 3-D Extrinsic Information Transfer (EXIT) charts are used to design binary Self-Concatenated Convolutional Codes employing Iterative Decoding (SECCC-ID), exchanging extrinsic information with the soft-decision demapper to approach the channel capacity. Recursive Systematic Convolutional (RSC) codes are selected as constituent codes, an interleaver is used for randomising the extrinsic information exchange of the constituent codes, while a puncturer helps to increase the achievable bandwidth efficiency. The convergence behaviour of the decoder is analysed with the aid of bit-based 3-D EXIT charts, for accurately calculating the operating Eb/N0 threshold, especially when SP based soft demapper is employed. Finally, we propose an attractive system configuration, which is capable of operating within about 1 dB from the channel capacity.