基于分布式空时编码的异构协作通信系统介绍及DMT分析

Introduction for Heterogeneous Cooperative Communication System and DMT Analysis Based on Distributed Space-time Coding

协作通信可以在衰落无线环境中提供显著的性能增益。大多数研究协作通信的文献都假设每个节点只有一根天线或几根同样类型的天线。目前,具备异构通信接口的移动终端变得越来越普遍,所以有必要在蜂窝网络中深入地进行协作通信的相关研究。介绍了一种适用于异构协作系统的VAA-DSTC模式,并证明了其不仅可以获取满分集增益,而且移动终端异构通信接口间的数据率差异可以带来额外的复用增益。然后,重点分析了VAA-DSTC模式的分集复用折中(DMT)性能,并与其它类型的协作模式进行了比较。

Cooperative communication has been recently proposed as a way to provide dramatic gains in fading wireless environments. Most literatures about cooperative communication assume each node are equipped with only one interface or several homogeneous interfaces. To date, mobile terminals with heterogeneous interfaces become more popular, which motivate us to study cooperative communication in heterogeneous cellular networks. We introduced a VAA DSTC scheme,which is suitable to heterogeneous cooperative communication system, and demonstrated that the data rate difference between heterogeneous interfaces can bring extra spatial multiplexing gain,in addition to diversity gain. Moreover,we characterized the diversity-multiplexing tradeoff of VAA_ DSTC scheme and compared it with other schemes.