Generic Permutation Network for QC-LDPC Decoder

Xiao PENG
Xiongxin ZHAO
Zhixiang CHEN
Fumiaki MAEHARA
Satoshi GOTO

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A    No.12    pp.2551-2559
Publication Date: 2010/12/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.2551
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: High-Level Synthesis and System-Level Design
Keyword: 
LDPC decoder,  reconfigurable,  permutation network,  parallelism,  

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Summary: 
Permutation network plays an important role in the reconfigurable QC-LDPC decoder for most modern wireless communication systems with multiple code rates and various code lengths. This paper presents the generic permutation network (GPN) for the reconfigurable QC-LDPC decoder. Compared with conventional permutation networks, this proposal could break through the input number restriction, such as power of 2 and other limited number, and optimize the network for any application in demand. Moreover, the proposed scheme could greatly reduce the latency because of less stages and efficient control signal generating algorithm. In addition, the proposed network processes the nature of high parallelism which could enable several groups of data to be cyclically shifted simultaneously. The synthesis results using the 90 nm technology demonstrate that this architecture can be implemented with the gate count of 18.3k for WiMAX standard at the frequency of 600 MHz and 10.9k for WiFi standard at the frequency of 800 MHz.