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SUPERVISED LEARNING BASED SPARSE CHANNEL ESTIMATION FOR RIS AIDED COMMUNICATIONS

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Citation Author(s):
Dilin Dampahalage, K. B. Shashika Manosha, Nandana Rajatheva, Matti Latva-aho
Submitted by:
Dilin Dampahalge
Last updated:
8 May 2022 - 4:36am
Document Type:
Presentation Slides
Event:
ICASSP 2022
Presenters:
Dilin Dampahalage
Paper Code:
5595
Categories:
Communication Systems and Applications
 

An reconfigurable intelligent surface (RIS) can be used to establish line-of-sight (LoS) communication when the direct path is compromised, which is a common occurrence in a millimeter wave (mmWave) network. In this paper, we focus on the uplink channel estimation of a such network. We formulate this as a sparse signal recovery problem, by discretizing the angle of arrivals (AoAs) at the base station (BS). On-grid and off-grid AoAs are considered separately. In the on-grid case, we propose an algorithm to estimate the direct and RIS channels. Neural networks trained based on supervised learning is used to estimate the residual angles in the off-grid case, and the AoAs in both cases. Numerical results show the performance gains of the proposed algorithms in both cases.

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