Massive MIMO系统是5G通信的关键技术，而上行导频污染是Massive MIMO蜂窝网络TDD系统的主要性能瓶颈。解决这个问题的有效方法是在时间维度上错开相邻小区之间发射的导频序列。本文在综述了两种运用导频序列减轻相邻小区的导频污染基础上，提出了一种新型的蜂窝系统中小区划分方案，即将每3个小区划分为一组，并在小组内应用交错帧结构，在时隙上错开小组内小区导频序列，并结合蜂窝系统中小区自行划分调度的方法，来共同达到减轻导频污染的目的。%Massive multiple-input multiple-output (MIMO) system is the key technology in fifth generation (5G) wireless systems. However, the uplink pilot contamination limits the performance of massive MIMO cellular network in time division duplex (TDD) wireless system severely. An efficient way to solve this problem is shifting the location of pilots in time frames used in neighboring cells. To deal with this problem, a new cell assignment scheme is proposed in this letter. Specifically, dividing each three adjacent cells into one group,then the time interleaved frame can be used in order to shift the location of pilot in time frame at one group. By coordinating among base stations,the cells can be divided into groups by themselves. Thus, the problem of pilot contamination could be solved, greatly enhancing the performance of all system.
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