Time-Varying Channel Prediction for RIS-Assisted MU-MISO Networks via Deep Learning

• URL: http://arxiv.org/abs/2111.04971v1
• Date: Tue, 9 Nov 2021 07:26:51 GMT
• Title: Time-Varying Channel Prediction for RIS-Assisted MU-MISO Networks via Deep Learning
• Authors: Wangyang Xu, Jiancheng An, Yongjun Xu, Chongwen Huang, Lu Gan, and Chau Yuen
• Abstract summary: Reconfigurable intelligent surface (RIS) has become a promising technology to improve the signal transmission quality of wireless communications. However, accurate, low-latency and low-pilot-overhead channel state information (CSI) acquisition remains a considerable challenge in RIS-assisted systems. We propose a three-stage joint channel decomposition and prediction framework to require CSI.
• Score: 15.444805225936992
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: To mitigate the effects of shadow fading and obstacle blocking, reconfigurable intelligent surface (RIS) has become a promising technology to improve the signal transmission quality of wireless communications by controlling the reconfigurable passive elements with less hardware cost and lower power consumption. However, accurate, low-latency and low-pilot-overhead channel state information (CSI) acquisition remains a considerable challenge in RIS-assisted systems due to the large number of RIS passive elements. In this paper, we propose a three-stage joint channel decomposition and prediction framework to require CSI. The proposed framework exploits the two-timescale property that the base station (BS)-RIS channel is quasi-static and the RIS-user equipment (UE) channel is fast time-varying. Specifically, in the first stage, we use the full-duplex technique to estimate the channel between a BS's specific antenna and the RIS, addressing the critical scaling ambiguity problem in the channel decomposition. We then design a novel deep neural network, namely, the sparse-connected long short-term memory (SCLSTM), and propose a SCLSTM-based algorithm in the second and third stages, respectively. The algorithm can simultaneously decompose the BS-RIS channel and RIS-UE channel from the cascaded channel and capture the temporal relationship of the RIS-UE channel for prediction. Simulation results show that our proposed framework has lower pilot overhead than the traditional channel estimation algorithms, and the proposed SCLSTM-based algorithm can also achieve more accurate CSI acquisition robustly and effectively.

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