Design and performance analysis of reconfigurable intelligent surface and half-duplex amplify-and-forward relay hybrid network system^✩

Abstract

A Reconfigurable Intelligent Surface (RIS) can relay signals from the transmitter to the receiver. In this regard, RISs operate similarly to traditional relays. We design a Multiple-Input-Multiple-Output (MIMO) system with a hybrid network of RIS and Half-Duplex (HD) Amplify-and-Forward (AF) relay. We model the system’s signal propagation and propose a new algorithm to get the system’s Achievable Rate (AR) value. We complete simulations to evaluate the performance of the RIS and HD-AF relay hybrid network system compared to the system assisted by either the RIS or HD-AF relay. The simulations indicate that many factors can considerably influence the system performance. Selecting an optimal placement for the RIS and relay can result in the best performance for the RIS and HD-AF relay hybrid network system in situations where the direct link between the receiver and transmitter is absent.

Keywords

MIMO / RIS / HD-AF relay / Hybrid network / AR

References

[1] E. Bjornson, O. Ozdogan, E.G. Larsson, Reconfigurable intelligent surfaces: three myths and two critical questions, IEEE Commun. Mag. 58 (12) (2020) 90-96.

[2] F. Zheng, Y. Liang, B. Ni, Performance comparison of reconfigurable intelligent sur-face and half-duplex decode-and-forward relay over Rician fading channels, China Commun. (2025), in press.

[3] Q. Wu, R. Zhang, Intelligent reflecting surface enhanced wireless network via joint active and passive beamforming, IEEE Trans. Wirel. Commun. 18 (11) (2019) 5394-5409.

[4] Z. Mohamed, C. Chen, S. Aïssa, SLNR-based precoding for multi-user communica-tions assisted with reconfigurable surfaces (invited paper), in: 2021 International Wireless Communications and Mobile Computing, IWCMC, 2021, pp. 2188-2193.

[5] C. Huang, A. Zappone, G.C. Alexandropoulos, M. Debbah, C. Yuen, Reconfigurable intelligent surfaces for energy efficiency in wireless communication, IEEE Trans. Wirel. Commun. 18 (8) (2019) 4157-4170.

[6] Q.-U.-A. Nadeem, A. Kammoun, A. Chaaban, M. Debbah, M.-S. Alouini, Asymptotic max-min SINR analysis of reconfigurable intelligent surface assisted MISO systems, IEEE Trans. Wirel. Commun. 19 (12) (2020) 7748-7764.

[7] K. Ntontin, M. Di Renzo, F. Lazarakis, On the rate and energy efficiency comparison of reconfigurable intelligent surfaces with relays, in: 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2020, pp. 1-5.

[8] A.-A.A. Boulogeorgos, A. Alexiou, Performance analysis of reconfigurable intelli-gent surface-assisted wireless systems and comparison with relaying, IEEE Access 8 (2020) 94463-94483.

[9] J. Ye, S. Guo, M.-S. Alouini, Joint reflecting and precoding designs for SER mini-mization in reconfigurable intelligent surfaces assisted MIMO systems, IEEE Trans. Wirel. Commun. 19 (8) (2020) 5561-5574.

[10] H. Du, J. Zhang, J. Cheng, B. Ai, Millimeter wave communications with recon-figurable intelligent surfaces: performance analysis and optimization, IEEE Trans. Commun. 69 (4) (2021) 2752-2768.

[11] B.C. Nguyen, T.M. Hoang, L.T. Dung, T. Kim, On performance of two-way full-duplex communication system with reconfigurable intelligent surface, IEEE Access 9 (2021) 81274-81285.

[12] Y. Zhou, F. Nan, L. Gao, Operator perspective: how to choose between the RIS and full/half-duplex relay, in: 2023 IEEE International Symposium on Broadband Multi-media Systems and Broadcasting, BMSB, 2023, pp. 1-6.

[13] D.L. Galappaththige, A. Devkota, G. Amarasuriya, On the performance of IRS-assisted relay systems, in: 2021 IEEE Global Communications Conference, GLOBE-COM, 2021, pp. 1-6.

[14] Z. Chen, M.-M. Zhao, K. Xu, Y. Cai, M.-J. Zhao, Beamforming design for intelligent reflecting surface aided full-duplex relay systems, in: 2022 IEEE 12th Sensor Array and Multichannel Signal Processing Workshop, SAM, 2022, pp. 186-190.

[15] Z. Abdullah, S. Kisseleff, W. Alves Martins, G. Chen, L. Sanguinetti, K. Ntontin, A. Papazafeiropoulos, S. Chatzinotas, B. Ottersten, Cooperative hybrid networks with active relays and RISs for B5G: applications, challenges, and research directions, IEEE Wirel. Commun. 31 (1) (2024) 126-132.

[16] N.S. Perović, L.-N. Tran, M. Di Renzo, M.F. Flanagan, Achievable rate optimization for MIMO systems with reconfigurable intelligent surfaces, IEEE Trans. Wirel. Com-mun. 20 (6) (2021) 3865-3882.

[17] P. Anghel, M. Kaveh, Exact symbol error probability of a cooperative network in a Rayleigh-fading environment, IEEE Trans. Wirel. Commun. 3 (5) (2004) 1416-1421.

[18] A. Hjørungnes, Complex-Valued Matrix Derivatives:With Applications in Signal Pro-cessing and Communications, Cambridge University Press, 2011.

[19] N.T. Nguyen, Q.D. Vu, K. Lee, M. Juntti, Spectral efficiency optimization for hy-brid relay-reflecting intelligent surface, in: 2021 IEEE International Conference on Communications Workshops, ICC Workshops, 2021, pp. 1-6.