作者
Chun Huang, Jindan Xu, Wenhui Zhang, Wei Xu, Derrick Wing Kwan Ng
发表日期
2022/6/13
期刊
IEEE Transactions on Vehicular Technology
卷号
71
期号
9
页码范围
10173-10178
出版商
IEEE
简介
Reconfigurable intelligent surface (RIS) is a passive antenna array composed of a large number of reflecting elements. In a RIS-assisted communication system, it is a challenging task to acquire accurate channel state information (CSI). In this paper, we propose a semi-blind channel estimation method for a RIS-assisted massive multiple-input single-output (MISO) system. Assuming a Gaussian priori on the data symbols, an iterative expectation maximization (EM)-based algorithm is developed to obtain the maximum likelihood (ML) estimate of the cascaded RIS channel. Different from existing pilot-based methods, the proposed semi-blind channel estimation method exploits the data symbols for channel estimation enhancement and only a fraction of full-pilot signaling overhead is required. Simulation results verify that the proposed method achieves significant improvement in the accuracy of the channel …
学术搜索中的文章
C Huang, J Xu, W Zhang, W Xu, DWK Ng - IEEE Transactions on Vehicular Technology, 2022