J4 ›› 2010, Vol. 37 ›› Issue (3): 412-416.doi: 10.3969/j.issn.1001-2400.2010.03.005

• Original Articles • Previous Articles     Next Articles

A class of nonbinary quasi-cyclic LDPC codes with a low-density generator matrix

CHEN Chao;BAI Bao-ming;WANG Xin-mei   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an  710071, China)
  • Received:2009-05-19 Online:2010-06-20 Published:2010-07-23
  • Contact: CHEN Chao E-mail:chenchaoxidian@gmail.com

Abstract:

This paper presents a class of nonbinary quasi-cyclic low-density parity-check (QC-LDPC) codes, whose parity-check matrix consists of weight-2 columns. The parity-check matrix is carefully designed such that the corresponding generator matrix has some nice properties: (1) systematic, (2) quasi-cyclic, and (3) low-density, which allow a parallel encoding with low-complexity through simple shift-register circuits. Simulation results show that the proposed codes do not have performance degradation compared with randomly constructed codes.

Key words: low-density parity-check (LDPC) codes, nonbinary, quasi-cyclic (QC), low-density generator matrix, parallel encoding