International Journal of Wireless and Microwave Technologies (IJWMT)
IJWMT Vol. 15, No. 5, 8 Oct. 2025
Cover page and Table of Contents: PDF (size: 555KB)
Beamforming and Modulation Optimization for Active and Passive Reconfigurable Surfaces in 6G THz UMMIMO Networks: A Comparative Study
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Author(s)
Index Terms
6G, THz, Beamforming, Modulation, RIS, SNR, Computational Complexity
Abstract
The aim of this research is to comparatively evaluate and optimize the performance of active and passive Reconfigurable Intelligent Surfaces (RIS) in Terahertz (THz) Ultra Massive MIMO(UM-MIMO) systems for 6G Wireless Communication. The Primary objective is to analyze the impact of beamforming and adaptive modulation schemes on system capacity, computational complexity and power consumption. The study employs MATLAB based simulations under realistic wireless channel models including Rician fading channel and free space path loss to model the propagation behavior at THz Frequencies. Both active and passive RIS configuration are assessed using hybrid beamforming and multi antenna transmission techniques. Simulation results demonstrate that active RIS improves system capacity compared to passive RIS. Particularly at higher SNR level, while incurring more power consumption. Conversely, passive RIS offers better energy efficiency and lower complexity, making it suitable for low-power scenarios. These findings highlight critical design trade-offs and support the development of hybrid RIS assisted UM-MIMO architectures for efficient and scalable 6G THz communication systems.
Cite This Paper
Md. Mizanul Hoque, A. H. M. Asadul Huq, "Beamforming and Modulation Optimization for Active and Passive Reconfigurable Surfaces in 6G THz UMMIMO Networks: A Comparative Study", International Journal of Wireless and Microwave Technologies(IJWMT), Vol.15, No.5, pp. 47-56, 2025. DOI:10.5815/ijwmt.2025.05.04
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