Journal of Xidian University ›› 2019, Vol. 46 ›› Issue (2): 1-5.doi: 10.19665/j.issn1001-2400.2019.02.001

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Design of serial connecting multiple spatially coupled LDPC codes for block-fading channels

SUN Yue,LI Beilei,LIANG Caihong,LI Ying   

  1. State Key Lab. of Integrated Service Networks, Xidian Univ., Xi’an 710071, China
  • Received:2018-09-17 Online:2019-04-20 Published:2019-04-20

Abstract:

To improve the performance of spatially coupled low density parity check (SC-LDPC) codes over block-fading channels, a serial connecting multi-SC-LDPC (SC-MSC-LDPC) codes is proposed based on the structure characteristics of the SC-LDPC codes, which can lead to full diversity. By exchanging the edge connections of variable nodes at the same location of each subchain, multiple subchains are coupled to form the codes with a strong correlation between different fading blocks, which can effectively avoid the outage occurrence caused by deep fading blocks. The infinite-length performance is analyzed by utilizing the protograph-based extrinsic information transfer (PEXIT) algorithm. Furthermore, the finite-length performance is obtained via belief propagation (BP) decoding. Simulation results show that the proposed SC-MSC-LDPC codes improve the performance of SC-LDPC codes over the block-fading channels.

Key words: block-fading channels, spatially coupled LDPC codes, protograph-based extrinsic information transfer, belief propagation

CLC Number: 

  • TN911.22

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