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Reconfigurable intelligent surface assisted multi-carrier wireless systems for doubly selective high-mobility Ricean channels

Reconfigurable intelligent surface assisted multi-carrier wireless systems for doubly selective high-mobility Ricean channels
Reconfigurable intelligent surface assisted multi-carrier wireless systems for doubly selective high-mobility Ricean channels
Reconfigurable intelligent surfaces (RIS) constitute a revolutionary technique of beneficially reconfiguring the smart radio environment. However, despite the fact that wireless propagation is of time-varying nature, most of the existing RIS contributions focus on time-invariant scenarios for the following reasons. Firstly, it becomes impractical to instantaneously feed back the control signal based on the doubly selective non-line-ofsight (NLoS) fading scenario. Secondly, channel estimation conceived for the high-mobility and high-dimensional RIS-assisted links has to take into account the spatial-domain (SD), timedomain (TD), and frequency-domain (FD) correlations imposed by the angle-of-arrival/departure (AoA/AoD), the Doppler and the orthogonal frequency-division multiplexing (OFDM) operations, respectively, where none of the existing solutions can be directly applied. Thirdly, it is far from trivial to maximize the NLoS channel powers on all subcarriers by a common set of RIS reflecting coefficients. Fourthly, in the face of double selectivity, it becomes inevitable to encounter either inter-symbol interference (ISI) or inter-channel interference (ICI) during the signal detection in the TD or in the FD, respectively. Against this background, firstly, we focus our attention on line-of-sight (LoS) dominated unmanned aerial vehicle (UAV) scenarios. Secondly, we conceive new minimum mean squared error (MMSE) channel estimation methods for doubly selective fading, which perodically transmit pilot symbols embedded into the TD and FD over the SD in order to beneficially exploit the correlations in the three domains. Thirdly, the RIS coefficients are optimized by a low-complexity algorithm based on the LoS representation of the end-to-end system model. Fourthly, tailor-made interference
cancallation techniques are devised for improving the signal detection both in the FD and in the TD. Our simulation results are examined in six frequency bands licensed in 5G, which confirms that the employment of RIS is capable of achieving substantial
performance improvements.
Autonomous aerial vehicles, Channel estimation, Doppler effect, Fading channels, Interference, OFDM, Reconfigurable intelligent surface, Wireless communication, channel estimation, double selectivity, high-mobility, inter-channel interference, inter-symbol interference, orthogonal frequency-division multiplexing, space-air-ground, unmanned aerial vehicle
0018-9545
4023-4041
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
An, Jiancheng
38f5bae7-e6d1-4767-8e81-b402ac61943f
Bai, Tong
58cbdac7-1cea-4346-8fe2-70b4c9f2cc16
Xiang, Luping
56d951c0-455e-4a67-b167-f6c8233343b1
Sugiura, Shinya
0f1b2d3e-e804-4bc9-8507-1a057c460239
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
An, Jiancheng
38f5bae7-e6d1-4767-8e81-b402ac61943f
Bai, Tong
58cbdac7-1cea-4346-8fe2-70b4c9f2cc16
Xiang, Luping
56d951c0-455e-4a67-b167-f6c8233343b1
Sugiura, Shinya
0f1b2d3e-e804-4bc9-8507-1a057c460239
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Yang, Lie-Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Xu, Chao, An, Jiancheng, Bai, Tong, Xiang, Luping, Sugiura, Shinya, Maunder, Robert, Yang, Lie-Liang and Hanzo, Lajos (2022) Reconfigurable intelligent surface assisted multi-carrier wireless systems for doubly selective high-mobility Ricean channels. IEEE Transactions on Vehicular Technology, 71 (4), 4023-4041. (doi:10.1109/TVT.2022.3147859).

Record type: Article

Abstract

Reconfigurable intelligent surfaces (RIS) constitute a revolutionary technique of beneficially reconfiguring the smart radio environment. However, despite the fact that wireless propagation is of time-varying nature, most of the existing RIS contributions focus on time-invariant scenarios for the following reasons. Firstly, it becomes impractical to instantaneously feed back the control signal based on the doubly selective non-line-ofsight (NLoS) fading scenario. Secondly, channel estimation conceived for the high-mobility and high-dimensional RIS-assisted links has to take into account the spatial-domain (SD), timedomain (TD), and frequency-domain (FD) correlations imposed by the angle-of-arrival/departure (AoA/AoD), the Doppler and the orthogonal frequency-division multiplexing (OFDM) operations, respectively, where none of the existing solutions can be directly applied. Thirdly, it is far from trivial to maximize the NLoS channel powers on all subcarriers by a common set of RIS reflecting coefficients. Fourthly, in the face of double selectivity, it becomes inevitable to encounter either inter-symbol interference (ISI) or inter-channel interference (ICI) during the signal detection in the TD or in the FD, respectively. Against this background, firstly, we focus our attention on line-of-sight (LoS) dominated unmanned aerial vehicle (UAV) scenarios. Secondly, we conceive new minimum mean squared error (MMSE) channel estimation methods for doubly selective fading, which perodically transmit pilot symbols embedded into the TD and FD over the SD in order to beneficially exploit the correlations in the three domains. Thirdly, the RIS coefficients are optimized by a low-complexity algorithm based on the LoS representation of the end-to-end system model. Fourthly, tailor-made interference
cancallation techniques are devised for improving the signal detection both in the FD and in the TD. Our simulation results are examined in six frequency bands licensed in 5G, which confirms that the employment of RIS is capable of achieving substantial
performance improvements.

Text
RIS_Ricean_OFDM_Accept_two_col - Accepted Manuscript
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More information

Published date: 1 February 2022
Keywords: Autonomous aerial vehicles, Channel estimation, Doppler effect, Fading channels, Interference, OFDM, Reconfigurable intelligent surface, Wireless communication, channel estimation, double selectivity, high-mobility, inter-channel interference, inter-symbol interference, orthogonal frequency-division multiplexing, space-air-ground, unmanned aerial vehicle

Identifiers

Local EPrints ID: 454586
URI: http://eprints.soton.ac.uk/id/eprint/454586
ISSN: 0018-9545
PURE UUID: 3aa75f5f-2208-43a5-8b12-cf5ddf4f6b93
ORCID for Chao Xu: ORCID iD orcid.org/0000-0002-8423-0342
ORCID for Luping Xiang: ORCID iD orcid.org/0000-0003-1465-6708
ORCID for Robert Maunder: ORCID iD orcid.org/0000-0002-7944-2615
ORCID for Lie-Liang Yang: ORCID iD orcid.org/0000-0002-2032-9327
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 16 Feb 2022 17:46
Last modified: 13 Aug 2022 01:46

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Contributors

Author: Chao Xu ORCID iD
Author: Jiancheng An
Author: Tong Bai
Author: Luping Xiang ORCID iD
Author: Shinya Sugiura
Author: Robert Maunder ORCID iD
Author: Lie-Liang Yang ORCID iD
Author: Lajos Hanzo ORCID iD

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