Analysis of Downlink Channel Estimation Based on Parametric Model in Massive MIMO Systems
This paper investigates downlink channel estimation in massive multiple-input multiple-output(MIMO)systems.To reduce the overhead of downlink channel estimation and uplink feedback in FDD systems,cascaded precoding has been used in massive MIMO such that only a low-dimensional effective channel needs to be estimated and fed back.In this paper,we analyze a strategy for downlink channel estimation based on the parametric model in massive MIMO with cascaded precoding.The path delays of uplink channels are first estimated and quantized at the base station,then fed forward to the user equipment(UE)through a dedicated feedforward link.In this manner,the UE can obtain the a priori knowledge of the downlink channel in advance since it has been demonstrated that the downlink and the uplink channels can have identical path delays.Our analysis and simulation results show that the proposed approach can achieve near-MMSE performance.
Massive MIMO channel estimation parametric model limited feedforward cascaded precoding
Kai Liu Cheng Tao Liu Liu Yanping Lu Tao Zhou Jiahui Qiu
Institute of Broadband Wireless Mobile Communications,Beijing Jiaotong University,Beijing 100044,P.R Institute of Broadband Wireless Mobile Communications,Beijing Jiaotong University,Beijing 100044,P.R Network Technology Research Institute of China United Network Communications Group Co.,Ltd.,Beijing
国际会议
杭州
英文
1-4
2018-12-03（万方平台首次上网日期，不代表论文的发表时间）