Matrix-Calibration-Based Cascaded Channel Estimation for Reconfigurable Intelligent Surface Assisted Multiuser MIMO

12/19/2019
by   Hang Liu, et al.
0

Reconfigurable intelligent surface (RIS) is envisioned to be an essential component of the paradigm for beyond 5G networks as it can potentially provide similar or higher array gains with much lower hardware cost and energy consumption compared with the massive multiple-input multiple-output (MIMO) technology. In this paper, we focus on one of the fundamental challenges, namely the channel acquisition, in an RIS-assisted multiuser MIMO system. The state-of-the-art channel acquisition approach in such a system with fully passive RIS elements estimates the cascaded transmitter-to-RIS and RIS-to-receiver channels by adopting excessively long training sequences. To estimate the cascaded channels with an affordable training overhead, we formulate the channel estimation problem in the RIS-assisted multiuser MIMO system as a matrix-calibration based matrix factorization task. By exploiting the information on the slow-varying channel components and the hidden channel sparsity, we propose a novel message-passing based algorithm to factorize the cascaded channels. Furthermore, we present an analytical framework to characterize the theoretical performance bound of the proposed estimator in the large-system limit. Finally, we conduct simulations to verify the high accuracy and efficiency of the proposed algorithm.

READ FULL TEXT

page 1

page 2

page 3

page 4

research
01/18/2021

Semi-Blind Cascaded Channel Estimation for Reconfigurable Intelligent Surface Aided Massive MIMO

Reconfigurable intelligent surface (RIS) is envisioned to be a promising...
research
05/20/2019

Cascaded Channel Estimation for Large Intelligent Metasurface Assisted Massive MIMO

In this paper, we consider the problem of channel estimation for large i...
research
12/23/2019

Channel Estimation Method and Phase Shift Design for Reconfigurable Intelligent Surface Assisted MIMO Networks

Reconfigurable intelligent surface (RIS) aided multiple-input multiple-o...
research
08/19/2021

Cost-Efficient RIS-Aided Channel Estimation via Rank-One Matrix Factorization

A reconfigurable intelligent surface (RIS) consists of massive meta elem...
research
07/21/2023

Channel Estimation for RIS-Aided MIMO Systems: A Partially Decoupled Atomic Norm Minimization Approach

Channel estimation (CE) plays a key role in reconfigurable intelligent s...
research
01/23/2021

Channel Estimation for RIS Assisted Wireless Communications: Part II – An Improved Solution Based on Double-Structured Sparsity

Reconfigurable intelligent surface (RIS) can manipulate the wireless com...

Please sign up or login with your details

Forgot password? Click here to reset