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Rate-Compatible LDPC Codes Based on the PEG Algorithm for Relay Communication Systems  

Zhou, Yangzhao (School of Information Science and Technology, Donghua University)
Jiang, Xueqin (School of Information Science and Technology, Donghua University)
Lee, Moon Ho (Division of Electronics and Information Engineering, Chonbuk National University)
Publication Information
Journal of Communications and Networks / v.17, no.4, 2015 , pp. 346-350 More about this Journal
Abstract
It is known that the progressive edge-growth (PEG) algorithm can be used to construct low-density parity-check (LDPC) codes at finite code lengths with large girths through the establishment of edges between variable and check nodes in an edge-by-edge manner. In [1], the authors derived a class of LDPC codes for relay communication systems by extending the full-diversity root-LDPC code. However, the submatrices of the parity-check matrix H corresponding to this code were constructed separately; thus, the girth of H was not optimized. To solve this problem, this paper proposes a modified PEG algorithm for use in the design of large girth and full-diversity LDPC codes. Simulation results indicated that the LDPC codes constructed using the modified PEG algorithm exhibited a more favorable frame error rate performance than did codes proposed in [1] over block-fading channels.
Keywords
Low-density parity-check (LDPC) codes; progressive edge-growth (PEG) algorithm; relay;
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