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Check Node Reliability-Based Scheduling for BP Decoding of Non-Binary LDPC Codes

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3 Author(s)
Guojun Han ; School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. G. Han is also with the School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, China ; Yong Liang Guan ; Xinmei Huang

Scheduling strategy is considered an important aspect of belief-propagation (BP) decoding of low-density parity-check (LDPC) codes because it affects the decoder's convergence rate, decoding complexity and error-correction performance. In this paper, we propose two new scheduling strategies for the BP decoding of non-binary LDPC (NB-LDPC) codes. Both the strategies are devised based on the concept of check node reliability and employ a heuristically defined threshold which can adapt to the communication channel variations. As the scheduling strategies only update a subset of the check nodes in each iteration, they result in reduced iteration cost. Furthermore, since the BP performs suboptimally for finite-length LDPC codes, especially for short-length LDPC codes, by enhancing the message propagation over the Tanner Graphs of short-length NB-LDPC codes, the new scheduling strategies can even improve the error-correction performances of BP decoding. Simulation results demonstrate that the new scheduling strategies provide good performance/complexity tradeoffs.

Published in:

IEEE Transactions on Communications  (Volume:61 ,  Issue: 3 )