多径信道下的异步分布式线性卷积空时编码  

Asynchronous Distributed Linear Convolutional Space-Time Code under Multipath Channels

作　　者：种稚萌[1] 朱世华[1] 吕刚明[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049

出　　处：《电子与信息学报》2009年第6期1415-1419,共5页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60372055)资助课题

摘　　要：分布式空时编码系统中,由于各个中继节点之间的传输不同步会造成分布式空时编码的性能损失。针对这一问题,该文设计了一种异步分布式线性卷积空时编码。通过一种具有特殊结构的生成矩阵的设计,该编码可以在多径信道和中继节点异步传输模型下获得满分集增益。另外,由于该编码的线性特性,因而可以使用迫零(ZF),最小均方误差(MMSE)以及基于最小均方误差的判决反馈(MMSE-DFE)检测器检测。理论分析和仿真结果均表明,该文提出的异步分布式线性卷积空时编码可以在没有同步传输的假设下,采用次最优检测器来获得满分集增益。The performance of distributed space-time code can be severely degraded due to timing offsets among relay nodes. Focusing on this problem, an Asynchronous Distributed Linear Convolutional Space-Time Code （ADLC-STC） is proposed in this paper. By designing a family of generating matrices with special structures, the proposed ADLC-STC can achieve full diversity order under frequency-selective channels without the synchronous assumption. Moreover, because of its linearity, the proposed ADLC-STC can be decoded by zero-forcing （ZF）, MMSE, MMSE-DFE detectors. Theoretical analysis and simulation results show that, with the suboptimal detectors, the ADLC-STC can achieve full diversity order without the synchronous transmission assumption.

关 键 词：无线通信 异步协作分集 分布式空时编码 分布式线性空时卷积码 多径信道 

分 类 号：TN929.5[电子电信—通信与信息系统]