ZTE Communications ›› 2022, Vol. 20 ›› Issue (1): 48-56.DOI: 10.12142/ZTECOM.202201007

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Markovian Cascaded Channel Estimation for RIS Aided Massive MIMO Using 1‑Bit ADCs and Oversampling

SHAO Zhichao, YAN Wenjing, YUAN Xiaojun()   

  1. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
  • Received:2021-12-27 Online:2022-03-25 Published:2022-04-06
  • About author:SHAO Zhichao received the B.S. degree in information engineering from Xidian University, China in 2012, the M.S. degree in electrical engineering from Technische Universit?t Dresden, Germany in 2016, and the Ph.D. degree in electrical engineering from the Pontifical Catholic University of Rio de Janeiro, Brazil in 2020. Currently, he is a post-doctoral researcher with the National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China (UESTC). His research interests lie in communications and signal processing.|YAN Wenjing received the B.S. degree from Chongqing University, China in 2018, and the M.S. degree from University of Electronic Science and Technology of China (UESTC) in 2021. She is currently pursuing the Ph.D. degree with the Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology (HKUST), China. Her contribution to the work in this paper was done when she was with UESTC.|YUAN Xiaojun (xjyuan@uestc.edu.cn) received the Ph.D. degree in electrical engineering from the City University of Hong Kong, China in 2009. From 2009 to 2011, he was a research fellow with the Department of Electronic Engineering, City University of Hong Kong. He was also a visiting scholar with the Department of Electrical Engineering, University of Hawaii at Manoa, USA in spring and summer 2009, as well as in the same period of 2010. From 2011 to 2014, he was a research assistant professor with the Institute of Network Coding, The Chinese University of Hong Kong, China. From 2014 to 2017, he was an assistant professor with the School of Information Science and Technology, Shanghai Tech University, China. He is currently a State-Specially-Recruited Professor with the Center for Intelligent Networking and Communications, University of Electronic Science and Technology of China. His research interests include signal processing, machine learning, and wireless communications, including but not limited to multi-antenna and cooperative communications, sparse and structured signal recovery, Bayesian approximate inference, and network coding. He has published more than 180 peer-reviewed research articles in the leading international journals and conferences in the related areas. He has served on a number of technical programs for international conferences. He was a co-recipient of the Best Paper Award of IEEE International Conference on Communications (ICC) 2014 and a co-recipient of the Best Journal Paper Award of IEEE Technical Committee on Green Communications and Computing (TCGCC) 2017. He has been an editor of IEEE Transactions on Communications since 2017 and IEEE Transactions on Wireless Communications since 2018.


A reconfigurable intelligent surface (RIS) aided massive multiple-input multiple-output (MIMO) system is considered, where the base station employs a large antenna array with low-cost and low-power 1-bit analog-to-digital converters (ADCs). To compensate for the performance loss caused by the coarse quantization, oversampling is applied at the receiver. The main challenge for the acquisition of cascaded channel state information in such a system is to handle the distortion caused by the 1-bit quantization and the sample correlation caused by oversampling. In this work, Bussgang decomposition is applied to deal with the coarse quantization, and a Markov chain is developed to characterize the banded structure of the oversampling filter. An approximate message-passing based algorithm is proposed for the estimation of the cascaded channels. Simulation results demonstrate that our proposed 1-bit systems with oversampling can approach the 2-bit systems in terms of the mean square error performance while the former consumes much less power at the receiver.

Key words: massive MIMO, reconfigurable intelligent surface, channel estimation, 1-bit ADCs, oversampling