基于旋转准正交空时分组码的LDPC编码性能  

A Study of LDPC Combined CR-QOSTBC Encoding Performance

作　　者：辛亮[1,2] 柏鹏[2] 彭卫东[2] 林志国[1,2] 

机构地区：[1]空军工程大学装备管理与安全工程学院,陕西西安710051 [2]空军工程大学综合电子信息系统与电子对抗技术研究中心,陕西西安710051

出　　处：《空军工程大学学报（自然科学版）》2014年第6期72-76,共5页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：陕西省重点实验室基金资助项目(201102Y02)

摘　　要：为了提高空时分组码在多输入多输出通信系统的性能,提出一种新的准正交空时分组码,并且结合星座旋转设计和交织技术。通过星座旋转准正交空时分组码,以牺牲一定解码的简单性,来避免当天线数目大于2时,正交空时分组码码率下降的缺点;并与LDPC码进行级联编码,来降低系统误码率及提高系统的可靠性要求。多输入多输出通信系统可以很好地解决多径效应,获得很高的分集增益。仿真结果表明:与没有经过星座旋转的准正交空时分组码系统相比较,这种新的编码方法可以有效地降低误码率,提高系统的性能。在误码率10-5时,CRQOSTBC级联LDPC码与QOSTBC级联LDPC码相比有1.8dB的信噪比改善,CR-QOSTBC级联LDPC码相对于未级联LDPC码的QOSTBC在10-3时有5.3dB性能提升。In order to improve the performance of the space-time block codes in multiple input and multiple output communication system,this paper proposes a new kind of quasi-orthogonal space-time block codes（QOSTBC）combined with the constellation rotation.Through the constellation rotation quasi-orthogonal space-time block codes（CR-QOSTBC）,a certain decoding of simplicity can sacrifice themselves to avoid the bit rate decreased when the number of orthogonal space-time block codes（OSTBC）is greater than 2to encode with LDPC code.The multiple input and multiple output communication system can be used to solve the problem of the multipath effect,and obtain high diversity gain.The simulation results show that this new kind of coding method can effectively reduce the bit error rate,and can also improve the performance of the system compared with the QOSTBC system without the constellation rotation.When the bit error rate is 10-5,the CR-QOSTBC combined LDPC can improve by 1.8dB compared with the QOSTBCcombined LDPC.When the bit error rate is 10-3,the CR-QOSTBC combined LDPC can improve by 5.3dB compared with the QOSTBC.

关 键 词：MIMO 旋转准正交空时分组码 LDPC码 交织 

分 类 号：TN929.5[电子电信—通信与信息系统]