Untrained DNN for Channel Estimation of RIS-Assisted Multi-User OFDM System with Hardware Impairments
Nipuni Uthpala Ginige,K. B. Shashika Manosha,Nandana Rajatheva,Matti Latva-aho +3 more
- pp 561-566
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TLDR
In this article, an untrained deep neural network (DNN) based on the deep image prior (DIP) network is proposed to denoise the effective channel of the system obtained from the conventional pilot-based least-square (LS) estimation and acquire a more accurate estimation.Abstract:
Reconfigurable intelligent surface (RIS) is an emerging technology for improving performance in fifth-generation (5G) and beyond networks. Practically channel estimation of RIS-assisted systems is challenging due to the passive nature of the RIS. The purpose of this paper is to introduce a deep learning-based, low complexity channel estimator for the RIS-assisted multi-user single-input-multiple-output (SIMO) orthogonal frequency division multiplexing (OFDM) system with hardware impairments. We propose an untrained deep neural network (DNN) based on the deep image prior (DIP) network to denoise the effective channel of the system obtained from the conventional pilot-based least-square (LS) estimation and acquire a more accurate estimation. We have shown that our proposed method has high performance in terms of accuracy and low complexity compared to conventional methods. Further, we have shown that the proposed estimator is robust to interference caused by the hardware impairments at the transceiver and RIS.read more
Citations
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Proceedings ArticleDOI
MCRB-based Performance Analysis of 6G Localization under Hardware Impairments
Hui Chen,Sina Rezaei Aghdam,Musa Furkan Keskin,Yibo Wu,Simon Lindberg,Andreas Wolfgang,Ulf Gustavsson,Thomas Eriksson,Henk Wymeersch +8 more
TL;DR: This work model various types of impairments and conduct a misspecified Cramér-Rao bound analysis to evaluate the HWI-induced performance loss and results show that each HWI leads to a different level of degradation in angle and delay estimation performance.
Modeling and Analysis of 6G Joint Localization and Communication under Hardware Impairments
Hui Chen,Musa Furkan Keskin,Sina Rezaei Aghdam,Hyo Won Kim,Simon Lindberg,Andreas Wolfgang,Traian E. Abrudan,Thomas Eriksson,Henk Wymeersch +8 more
TL;DR: In this paper , the impact of hardware impairments on position and orientation estimation in sub-THz MIMO communication systems is investigated and the effect of individual and overall HWIs on communication in terms of symbol error rate (SER) is investigated.
Journal ArticleDOI
Active 3D Double-RIS-Aided Multi-User Communications: Two-Timescale-Based Separate Channel Estimation via Bayesian Learning
TL;DR: In this paper , a double-RIS-based channel estimation based on active RIS architectures with only one radio frequency (RF) chain was proposed to solve the problem of double-reflection channel estimation.
Journal ArticleDOI
Combining multi-RIS and relay for performance improvement of multi-user NOMA systems
TL;DR: In this article , the authors derived the analytical expressions of main performance metrics of the proposed multi-RIS-and-relay aided multiple-user NOMA system, including the outage probability (OP) and the achievable data rate (ADR) over Nakagami-m fading channels.
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Channel Training & Estimation for Reconfigurable Intelligent Surfaces: Exposition of Principles, Approaches, and Open Problems
TL;DR: A comprehensive exposition of principles and approaches in RIS channel estimation can be found in this paper , where the basic ideas underlying each class of techniques are reduced to their simplest form under a unified model and notation, and various approaches within each class are discussed.
References
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TL;DR: In this article, an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system under frequency-selective channels is considered and a practical transmission protocol with channel estimation is proposed.
Proceedings ArticleDOI
Channel Estimation and Low-complexity Beamforming Design for Passive Intelligent Surface Assisted MISO Wireless Energy Transfer
Deepak Mishra,Håkan Johansson +1 more
TL;DR: A novel channel estimation protocol for PIS-assisted energy transfer (PET) from a multiantenna power beacon (PB) to a single-antenna energy harvesting (EH) user is presented.
Journal ArticleDOI
Intelligent Reflecting Surface-Enhanced OFDM: Channel Estimation and Reflection Optimization
Beixiong Zheng,Rui Zhang +1 more
TL;DR: In this paper, a practical transmission protocol to execute channel estimation and reflection optimization successively for an IRS-enhanced orthogonal frequency division multiplexing (OFDM) system is proposed, where a novel reflection pattern at the IRS is designed to aid the channel estimation at the access point (AP) based on the received pilot signals from the user, for which the estimated CSI is derived in closed-form.