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中文摘要：
提出了2个减轻大规模天线蜂窝网络导频污染的方案：利用正交导频把蜂窝系统中的小区划分为两类一维大的天线阵列网络，每一类之内采用相同的导频，两类之间采用正交的导频，再利用导频功率控制方法减轻了导频污染。利用基站间的协调，以所有基站信道估计均方误差的求和最小为目标函数，寻求近似最优的导频序列长度和同导频用户发射导频时隙的分配方案，从而提高了信道估计的性能，提升了整个系统的下行链路可达和速率。
英文摘要：
Two pilot contamination reduction methods in very large MIMO cellular network were proposed by dividing all cells into two types of one-dimensional very large MIMO network. The same pilot sequences were used in cells in the same category while orthogonal pilot sequences were used between these two categorie. Then the pilot power control method can be used to achieve the purpose of alleviating pilot contamination. By coordinating among base stations, the nearly optimal length of pilot sequences and assignment of pilot transmission could be found through minimizing the sum of channel esti- mation mean square error of all base stations. Thus, much better performance of channel estimation could be obtained, greatly enhancing the sum rate in downlink in all cells.
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