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。
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.
出处
《通信学报》
EI
CSCD
北大核心
2014年第1期24-33,共10页
Journal on Communications
基金
国家自然科学基金资助项目(60902012
61071113
61201172
61201176)
国家科技重大专项基金资助项目(2011ZX03003-001-02
2011ZX03003-003-03)
教育部博士点新教师基金资助项目(20090092120013
20100092110010)
江苏省自然科学基金资助项目(BK2011598
BK2011019)~~
关键词
大规模多输入多输出
导频污染
蜂窝网络
时分双工系统
均方误差
very large multiple-input multiple-output
pilot contamination
cellular network
time division duplex system
mean square error
