分层异构网下的虚拟协作MIMO-STC编码研究

Virtual cooperative MIMO-STC coding based on tiered heterogeneous network

针对移动通信系统中,各单天线用户终端在协作过程中存在的由于用户个数动态变化而导致协作通信无法进行有效空时编码的问题,提出一种新的基于分层异构网络上的不同层之间的协作虚拟多输入多输出空时编码方案(multiple input multiple output space-time coding,MIMO-STC),即由多用户环境中的单天线移动终端共享彼此天线构成一个虚拟多发多收天线阵列,并结合线性弥散空时码编码理论,实现不同层用户簇间的可靠通信。该编码方案能够根据发送簇和接收簇中协作用户个数的具体情况灵活编码,提高分集增益和误码性能。仿真结果表明:采用弥散空时编码方案的虚拟协作通信系统能够有效对抗Raleigh信道下的多径衰落效应,提高系统性能。

In the mobile communication system,with the respect to the problems of space-time coding that the single antenna user terminals in the collaboration do not effectively work,since the number of users dynamic change. This paper proposes a new virtual MIMO-STC（ multiple input multiple output space-time coding） coding scheme which is based on the tiered heterogeneous network collaboration between the different layers,that is single antenna mobile terminals share their antennas to form a virtual multiple antenna array overcharged and coding theory in multi-user environment. Then the reliable communication between the different layers of the user clusters is achieved by being combined with linear dispersion spacetime. The coding scheme can code flexibly according to the number of collaborative users in the sending cluster and reception clusters,improving the diversity gain and BER performance. The simulation results show that the dispersion space-time coding scheme of virtual collaboration communication system can be against the effect of multipath fading under Raleigh channel effectively.