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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/15537

Title: Distributed LT Codes with Improved Error Floor Performance
Authors: He, Jiguang
Hussain, Iqbal
Li, Yong
Juntti, Markku
Matsumoto, Tad
Keywords: DLT codes
EXIT chart
error floor
multi-source relay networks
relay combining
Issue Date: 2019-01-01
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Magazine name: IEEE Access
DOI: 10.1109/ACCESS.2018.2890452
Abstract: Distributed Luby transform (DLT) codes achieve significant performance improvement in multi-source relay networks compared to the individual Luby transform (LT) code designed for each source. Since the DLT codes preserve the properties of the LT codes, the error floor is dominated by the low variablenode degrees in the bipartite graph, developed for iterative message passing decoding. Therefore, we analyze the error floor of the DLT codes for a multi-source, single relay, and single destination network over additive white Gaussian noise (AWGN) channels.We modify the encoding process at the sources and propose a new relay combining scheme at the relay. The encoding process at the sources and combining scheme at the relay are coordinated with the aim of improving the error floor performance of the proposed DLT codes. We derive a lower bound of the bit error probability of the DLT codes over AWGN channels. Furthermore, we optimize the relay degree distribution in terms of the overhead by using the framework of extrinsic information transfer (EXIT) chart analysis. Numerical results confirm that the proposed DLT coding scheme significantly outperforms the conventional scheme, especially in the error floor region.
Rights: This is the author's version of the work. Copyright (C) 2019 IEEE. IEEE Access, 2019, DOI:10.1109/ACCESS.2018.2890452. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
URI: http://hdl.handle.net/10119/15537
Material Type: publisher
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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