摘要
多输入多输出(MIMO)技术能在不占用额外带宽的前提下,有效地提高信道容量和频谱利用率,成为当前的研究热点。但是由于分布式MIMO天线位置差异,使得分布式MIMO中需要增加时延同步,目前时延同步的方法基本都是在传输信号前额外添加一段用于时延同步的数据头,因此产生了多余的开销,降低了同步效率。针对分布式MIMO系统的时延同步问题,提出了一种将叠加弱信号与盲分离相结合的同步方法,减小了时延同步开销。理论分析和仿真结果均表明此方案是可行的。
MIMO（multiple-input multiple-output）technology has become a research hotspot because it can effectively increase the channel capacity and spectrum efficiency without occupying additional bandwidth.However,the different position of antenna lead to delay synchronization in distributed MIMO system.At present,the common method of delay synchronization is that an additional data which is used for synchronization is added in the head of the transmission signals.In such a way,overhead is generated and the efficiency of synchronization is reduced.In this paper,a method combining the superposition of weak signal and blind separation is given to solve the problem of delay synchronization.The theoretical analysis and simulation both indicate that such method is feasible.
出处
《无线电通信技术》
2010年第5期14-16,共3页
Radio Communications Technology
基金
通信抗干扰技术国家重点实验室开放基金资助项目(JG2007055)
关键词
分布式MIMO
时延同步
叠加弱信号
盲分离
distributed MIMO
delay synchronization
superimposed weak signal
blind separation
