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Achievable rate as affected by active elements distribution in reconfigurable intelligent surfaces for wireless
Dongming Li1, Sixu Li1, Guilu Wu2,3
1College of Information Technology, Jilin Agricultural University, Changchun, China.
Peerj. Computer Science
|June 22, 2023
Summary
The geometry distribution of active elements on reconfigurable intelligent surfaces (RISs) significantly impacts communication rates. An eight-queens distribution enhances achievable rates by 7% compared to random or uniform arrangements in RISs-assisted wireless systems.
Area of Science:
- Wireless communication systems engineering
- Metamaterials and intelligent surfaces
- Information theory and signal processing
Background:
- Traditional reconfigurable intelligent surfaces (RISs) approaches for increasing communication rates often deploy active elements randomly.
- Performance analysis in RISs-assisted systems frequently overlooks the impact of active element geometry distribution.
- Optimizing active element placement is crucial for maximizing the efficiency of passive RISs.
Purpose of the Study:
- To investigate the influence of different active element geometry distributions on the achievable rate in RISs-assisted wireless communication systems.
- To compare the performance of random, uniform, and eight-queens distributions for active elements on RISs.
- To determine an optimal active element distribution for enhanced communication rates.
Main Methods:
- Analysis of three geometry distributions: random, uniform, and eight-queens, for active elements on RISs.
- Determination of optimal achievable rate based on a predefined codebook.
- Codebook generation linked to reflection beamforming codewords influenced by active element geometry.
Main Results:
- Different geometry distributions of active elements on RISs demonstrably affect achievable communication rates.
- The proposed eight-queens distribution yields the highest achievable rate among the tested distributions.
- A 7% improvement in achievable rate was observed using the eight-queens distribution compared to conventional methods.
Conclusions:
- The geometry distribution of active elements is a critical factor in RISs-assisted communication system performance.
- The eight-queens distribution offers a superior strategy for deploying active elements on RISs to maximize achievable rates.
- This optimized placement strategy enhances the overall efficiency of wireless communication systems utilizing passive RISs.
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