Achievable Rate Optimization for Stacked Intelligent Metasurface-Assisted Holographic MIMO Communications
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Stacked intelligent metasurfaces (SIM) is a revolutionary technology, which can outperform its single-layer counterparts by performing advanced signal processing relying on wave propagation. In this work, we exploit SIM to enable transmit precoding and receiver combining in holographic multiple-input multiple-output (HMIMO) communications, and we study the achievable rate by formulating a joint optimization problem of the SIM phase shifts at both sides of the transceiver and the covariance matrix of the transmitted signal. Notably, we propose its solution by means of an iterative optimization algorithm that relies on the projected gradient method, and accounts for all optimization parameters simultaneously. We also obtain the step size guaranteeing the convergence of the proposed algorithm. Simulation results provide fundamental insights such the performance improvements compared to the single-RIS counterpart and conventional MIMO system. Remarkably, the proposed algorithm results in the same achievable rate as the alternating optimization (AO) benchmark but with a less number of iterations.
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Papazafeiropoulos et al. [88] designed a hybrid architecture harnessing two SIMs to enhance transmit precoding and receiver combining in HMIMO communications.
“Specifically, Papazafeiropoulos et al. [88] designed a hybrid architecture harnessing two SIMs to enhance transmit precoding and receiver combining in HMIMO communications.”
From Emerging Technologies in Intelligent Metasurfaces: Shaping the Future of Wireless Communications (2026) · cites this paper as [88]
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Emerging Technologies in Intelligent Metasurfaces: Shaping the Future of Wireless Communications
An, J., Debbah, M., Cui, T. J., Chen, Z. N., & Yuen, C. (2026) · IEEE Transactions on Antennas and Propagation · doi:10.1109/tap.2025.3571069 · Cited by 72 · see citing works
“Specifically, Papazafeiropoulos et al. [88] designed a hybrid architecture harnessing two SIMs to enhance transmit precoding and receiver combining in HMIMO communications.”
Self-citationEmerging Technologies in Intelligent Metasurfaces: Shaping the Future of Wireless Communications
An, J., Debbah, M., Cui, T. J., Chen, Z. N., & Yuen, C. (2024) · arXiv · Cited by 72 · see citing works
“Specifically, Papazafeiropoulos et al. [88] designed a hybrid architecture harnessing two SIMs to enhance transmit precoding and receiver combining in HMIMO communications.”
Self-citation
- Authors
- Papazafeiropoulos, A., An, J., Kourtessis, P., Ratnarajah, T., & Chatzinotas, S.
- Affiliations
- University of Hertfordshire (GB)
- Nanyang Technological University (SG)
- University of Edinburgh (GB)
- University of Luxembourg (LU)
- ORCID
- Venue
- IEEE Transactions on Wireless Communications
- Published
- 2024-10
- Volume
- 23
- Issue
- 10
- Pages
- 13173-13186
- ISSN
- 1536-1276 (ISSN-L)
- 1558-2248
- OpenAlex
- W4397026518
- Cited by
- 71
- References
- 3
- Citations by year
- 2026: 27 · 2025: 38 · 2024: 6
- FWCI
- 7.34
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- IEEE Transactions on Wireless Communications (publishedVersion)
- arXiv (Cornell University) (submittedVersion, cc-by)
- Open Repository and Bibliography (University of Luxembourg) (submittedVersion, other-oa)
- DR-NTU (Nanyang Technological University) (submittedVersion)
- Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, cc-by)
- arXiv (Cornell University) (cc-by)
- Funders
- University of Hertfordshire’s Five-Year Vice Chancellor’s Research Fellowship
- National Research Fund, Luxembourg (RISOTTI)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced Wireless Communication Technologies
- Physical Sciences › Engineering › Aerospace Engineering › Advanced Antenna and Metasurface Technologies
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Keywords
- stacked intelligent metasurfaces, holographic MIMO, precoding, phase shift optimization, covariance matrix optimization, gradient projection, reconfigurable intelligent surface
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