Design of efciently encodable nonbinary LDPC codes for adaptive coded modulation  

作　　者：WANG XiuNi MA Xiao BAI BaoMing 

机构地区：[1]Department of Computer Engineering,Guangzhou University [2]Department of Electronics and Communication Engineering,Sun Yat-sen University [3]State Key Laboratory of ISN,Xidian University

出　　处：《Science China(Information Sciences)》2014年第2期43-53,共11页中国科学（信息科学）（英文版）

基　　金：supported jointly by National Basic Research Program of China(973 Program)(Grant No.2012CB316100);National Natural Science Foundation of China(Grant Nos.61100224,61302061);Foundation for Distinguished Young Talents in Higher Education of Guangdong,China(Grant No.LYM11095),and Foundation for Distinguished Young Talents in Higher Education of Guangzhou,China(Grant No.10A052)

摘　　要：This paper is concerned with constructions of nonbinary low-density parity-check （LDPC） codes for adaptive coded modulations （ACM）. A new class of efficiently encodable structured nonbinary LDPC codes are proposed. The defining parity-check matrices are composed of scalar circulant sub-matrices which greatly reduce the storage requirement when compared with random LDPC codes. With this special structure of parity- check matrix, an efficient encoding algorithm is presented. Based on the proposed codes, a family of variable- rate/variable-field nonbinary LDPC codes is designed for the ACM system. When combined with matched-size signal constellations, the family of constructed codes can achieve a wide range of spectral efficiency. Furthermore, the resultant ACM system can be implemented via a set of encoder and decoder. Simulation results show that the proposed nonbinary LDPC codes for the ACM system perform well.This paper is concerned with constructions of nonbinary low-density parity-check （LDPC） codes for adaptive coded modulations （ACM）. A new class of efficiently encodable structured nonbinary LDPC codes are proposed. The defining parity-check matrices are composed of scalar circulant sub-matrices which greatly reduce the storage requirement when compared with random LDPC codes. With this special structure of parity- check matrix, an efficient encoding algorithm is presented. Based on the proposed codes, a family of variable- rate/variable-field nonbinary LDPC codes is designed for the ACM system. When combined with matched-size signal constellations, the family of constructed codes can achieve a wide range of spectral efficiency. Furthermore, the resultant ACM system can be implemented via a set of encoder and decoder. Simulation results show that the proposed nonbinary LDPC codes for the ACM system perform well.

关 键 词：adaptive coded modulation （ACM） nonbinary LDPC codes q-ary codes variable-field LDPCcodes variable-rate LDPC codes 

分 类 号：TN911.2[电子电信—通信与信息系统]