标题：Spectral efficiency of massive MIMO networks with pilot contamination and channel covariance matrix estimation
作者：Zhang, Xiaoqing; Wu, Shangbin; Yu, Shanshan; Liu, Ju
作者机构：[Zhang, Xiaoqing; Yu, Shanshan; Liu, Ju] Shandong Univ, Sch Informat Sci & Engn, Jinan, Shandong, Peoples R China.; [Wu, Shangbin] Samsung R&D Inst 更多
通讯作者：Liu, Ju;Liu, J
通讯作者地址：[Liu, J]Shandong Univ, Sch Informat Sci & Engn, Jinan, Shandong, Peoples R China.
关键词：cellular radio; MIMO communication; antenna arrays; signal detection;; mean square error methods; covariance matrices; precoding; pilot; symbols; mean-squared error; existing estimation method; low-complexity; covariance matrix estimation method; spatial correlation; power leakage;; downlink precoder minimising signal detection error; practical channel; state information; uplink; massive multiple-input multiple-output; cellular network; SEs; channel covariance matrix estimation; pilot; contamination; massive MIMO networks; spectral efficiency
摘要：This study addresses spectral efficiencies (SEs) in a massive multiple-input multiple-output cellular network with pilot contamination. Both uplink and downlink SEs are investigated with practical channel state information. A downlink precoder minimising signal detection error and power leakage with considerations on spatial correlation has been derived. Also, a low-complexity covariance matrix estimation method has been proposed and compared with the existing estimation method in terms of normalised mean-squared error. It has been demonstrated via simulations that both uplink and downlink SEs using the proposed covariance matrix estimation method can grow with the number of antennas even with a relatively small number of pilot symbols.