摘要
以Davey(1998)提出的Monte-Carlo方法为基础的、适用于二进制PSK调制的二进制LDPC(Low-Density Parity-Check,低密度奇偶校验)码的最优化理论已经在相关文献中得到了验证。但由于q进制星座没有旋转对称性,因而限制了Davey的方法的应用。本文提出了应用在准正规编码类型上的一种有效的Davey型Monte-Carlo最优化编码设计方法。应用这种方法,可直接将GF(q)上的最优LDPC编码和任意的q进制调制结合起来,获得很高的带宽效率。本文采用MQAM和MPSK调制机制与准正规LDPC编码相结合的若干实例来论证该设计方法。
Optimization of binary LDPC (Low-Density Parity-Check) codes for application to binary PSK modulation has been demonstrated in the literature, on the basis of Monte-Carlo method proposed by Davey(1998). The lack of rotational symmetry in a generic q-ary signal constellation, however, limits the application of Davey's method. This paper proposes an efficient Davey-type Monte Carlo technique for code optimization within the category of quasi-regular codes, so that one can directly combine the optimized LDPC code over GF(q) with arbitrary q-ary modulation to achieve bandwidth efficiency in transmission. The validity of the proposed design procedure is illustrated through examples combining quasi-regular LDPC codes with MQAM and MPSK signaling schemes.
出处
《电子与信息学报》
EI
CSCD
北大核心
2007年第4期884-887,共4页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60572089)
教育部留学回国人员科研启动基金([2005]383)
重庆市自然科学基金(CSTC2004BB8602)
重庆市留学回国人员科技活动择优资助项目资助课题