Spatial path index modulation for RIS-aided massive MIMO
Spatial path index modulation for RIS-aided massive MIMO
The next generation wireless networks focus on improving the energy and spectral efficiency (SE/EE) of the communication systems in response to the demand for massive number of users and data rate. In this work, we aim to achieve the enhancement of SE and EE by employing index modulation (IM) techniques for reconfigurable intelligent surface (RIS)-aided communication systems. While RIS offers the network efficiency and improve the coverage, IM provides SE improvement by the transmission of additional index bits. In IM, we utilize the indices of the spatial paths between the base station and the user through the RIS. We introduce a low complexity approach for the design of hybrid beamformers, which are constructed by the steering vectors corresponding to the selected spatial path indices for IM. Via numerical experiments, we show that the proposed approach presents an improved SE performance, even higher than that of the use of fully-digital beamformers while using a few RF chains.
Index modulation, massive MIMO, millimeter wave, reconfigurable intelligent surface, spatial modulation
Elbir, Ahmet M.
e6ed2099-e755-4a39-ab80-d79bd1a53082
Celik, Abdulkadir
f8e72266-763c-4849-b38e-2ea2f50a69d0
Abdallah, Asmaa
86b80268-48be-4bc8-9577-c989e496e459
Eltawil, Ahmed M.
5eb9e965-5ec8-4da1-baee-c3cab0fb2a72
12 December 2025
Elbir, Ahmet M.
e6ed2099-e755-4a39-ab80-d79bd1a53082
Celik, Abdulkadir
f8e72266-763c-4849-b38e-2ea2f50a69d0
Abdallah, Asmaa
86b80268-48be-4bc8-9577-c989e496e459
Eltawil, Ahmed M.
5eb9e965-5ec8-4da1-baee-c3cab0fb2a72
Elbir, Ahmet M., Celik, Abdulkadir, Abdallah, Asmaa and Eltawil, Ahmed M.
(2025)
Spatial path index modulation for RIS-aided massive MIMO.
In 2025 IEEE 36th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2025.
IEEE.
6 pp
.
(doi:10.1109/PIMRC62392.2025.11274820).
Record type:
Conference or Workshop Item
(Paper)
Abstract
The next generation wireless networks focus on improving the energy and spectral efficiency (SE/EE) of the communication systems in response to the demand for massive number of users and data rate. In this work, we aim to achieve the enhancement of SE and EE by employing index modulation (IM) techniques for reconfigurable intelligent surface (RIS)-aided communication systems. While RIS offers the network efficiency and improve the coverage, IM provides SE improvement by the transmission of additional index bits. In IM, we utilize the indices of the spatial paths between the base station and the user through the RIS. We introduce a low complexity approach for the design of hybrid beamformers, which are constructed by the steering vectors corresponding to the selected spatial path indices for IM. Via numerical experiments, we show that the proposed approach presents an improved SE performance, even higher than that of the use of fully-digital beamformers while using a few RF chains.
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More information
Published date: 12 December 2025
Venue - Dates:
36th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2025, , Istanbul, Turkey, 2025-09-01 - 2025-09-04
Keywords:
Index modulation, massive MIMO, millimeter wave, reconfigurable intelligent surface, spatial modulation
Identifiers
Local EPrints ID: 510553
URI: http://eprints.soton.ac.uk/id/eprint/510553
ISSN: 2166-9570
PURE UUID: 8d547b35-6e83-4d70-8c38-714dc313c59e
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Date deposited: 13 Apr 2026 16:45
Last modified: 14 Apr 2026 02:17
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Contributors
Author:
Ahmet M. Elbir
Author:
Abdulkadir Celik
Author:
Asmaa Abdallah
Author:
Ahmed M. Eltawil
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