一种基于分布式空时码的协作MIMO分集复用折衷新方案

doi:10.3969/j.issn.1000-0801.2011.03.019

电信科学 ›› 2011, Vol. 27 ›› Issue (3): 71-77.doi: 10.3969/j.issn.1000-0801.2011.03.019

一种基于分布式空时码的协作MIMO分集复用折衷新方案

许晓荣¹,章坚武¹,郑宝玉²

¹ 杭州电子科技大学通信工程学院杭州310018
² 南京邮电大学信号处理与传输研究院南京210003

出版日期:2011-03-15 发布日期:2011-03-15
基金资助:
国家自然科学基金资助项目;浙江省科技计划项目“基于TDD的下一代移动通信智能天线研究与开发”，杭州电子科技大学青年教师科研启动基金“认知无线网络中基于多载波调制的资源分配关键技术研究”资助课题

A Novel Diversity-Multiplexing Tradeoff Scheme in Cooperative MIMO Based on Distributed Space-Time Coding

Xiaorong Xu¹,Jianwu Zhang¹,Baoyu Zheng²

¹ College of Telecommunication Engineering，Hangzhou Dianzi University，Hangzhou 310018，China
² Institute of Signal Processing and Transmission，Nanjing University of Posts and Telecommunications，Nanjing 210003，China

Online:2011-03-15 Published:2011-03-15

摘要/Abstract

摘要：

协作MIMO通过多个单天线节点的相互协作构造多发射天线，以此形成一种虚拟MIMO多天线阵列获得空间分集增益。考虑到协作MIMO特点，天线间采用分布式空时编码进行编码协作。文章研究了协作MIMO 中基于分布式空时码（DSTC）的分集复用折衷（DMT）新方案，该方案通过推导两种DSTC的中断概率与分集增益表达式，结合两类DSTC的DMT策略，根据改变复用增益阈值自适应获得最佳DMT与中断性能。数值仿真表明，所提的DMT策略可以逼近协作MIMO的DMT上限，协作节点采用该策略的中断性能仅次于上限的中断性能。在多节点构成协作MIMO网络分布式空时编码协作中，提出的DMT新方案可使系统高效地获得协作分集增益与中断性能。

关键词: 协作MIMO, 分布式空时码, 分集复用折衷, 中断性能

Abstract:

Cooperative MIMO which is composed of multiple single antenna nodes by cooperative communication could construct multiple virtual transmit antennas. Spatial diversity gain could be obtained from this virtual MIMO multiple antenna arrays. Considered the specific features of cooperative MIMO，code cooperation strategy with distributed space-time coding is implemented in the network. An enhanced diversity-multiplexing tradeoff（DMT）scheme based on distributed space-time coding （DSTC）in cooperative MIMO is studied. The expression of outage probability and diversity gain of two DSTC strategies are derived in detail. Based on the two DMT schemes of DSTC，the optimal DMT and outage performance of the enhanced DMT strategy could be obtained through altering the threshold of multiplexing gain adaptively. Numerical results indicate that，the proposed DMT scheme could be asymptotical to DMT upper bound in cooperative MIMO，and the corresponding outage performance is also inferior to that of upper bound. Hence，cooperative diversity gain and optimum outage behavior could be achieved simultaneously by the proposed DMT scheme for DSTC code cooperation in multi-node cooperative MIMO scenario.

Key words: cooperative MIMO, distributed space-time coding, diversity-multiplexing tradeoff, outage performance

许晓荣,章坚武,郑宝玉. 一种基于分布式空时码的协作MIMO分集复用折衷新方案[J]. 电信科学, 2011, 27(3): 71-77.

Xiaorong Xu,Jianwu Zhang,Baoyu Zheng. A Novel Diversity-Multiplexing Tradeoff Scheme in Cooperative MIMO Based on Distributed Space-Time Coding[J]. Telecommunications Science, 2011, 27(3): 71-77.

图/表 5

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一种基于分布式空时码的协作MIMO分集复用折衷新方案

A Novel Diversity-Multiplexing Tradeoff Scheme in Cooperative MIMO Based on Distributed Space-Time Coding

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