Sparse Irregular RIS for Adaptive Wireless Beamforming
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Solution Overview
Problem
Existing RIS-assisted wireless communication systems face challenges in enhancing capacity and adaptability due to limited RIS elements and poor adaptability to varying channels, leading to increased computational overhead and inability to handle changing conditions.
Innovation Solution
An irregular RIS architecture with sparsely arranged reconfigurable elements, controlled by a controller, allows for adaptable beamforming designs through an irregular topology optimization using a Tabu-Search algorithm, optimizing digital precoding and phase shifts to enhance system capacity and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional regular array RIS architecture is used, then the system structure is simple and easy to manufacture, but the system capacity and adaptability to varying channels are limited
Solution Approach 1:
The patent applies asymmetry by transitioning from a regular array RIS architecture to an irregular RIS architecture where elements are sparsely and irregularly arranged. This asymmetric configuration increases the degrees of freedom in beamforming design, enabling better adaptability to varying channel conditions while maintaining manageable system complexity through structured irregularity.
Solution Approach 2:
The patent implements dynamics by making the RIS element configuration reconfigurable and adaptable. The irregular RIS architecture allows dynamic adjustment of element positions and states to match varying channel conditions, enabling the system to adapt its structure rather than being fixed in a regular pattern.
2Productivity
If the number of RIS elements is increased to enhance capacity, then the system capacity improves, but the computational overhead and power consumption increase
Solution Approach 1:
The patent applies the extraction principle by selectively removing elements from a dense array to create a sparse irregular configuration. This reduces the total number of RIS elements required while maintaining or enhancing system capacity through optimized spatial distribution, thereby reducing power consumption and computational overhead associated with processing signals from fewer elements.
Solution Approach 2:
The patent changes the spatial distribution parameter of RIS elements from uniform regular spacing to irregular sparse distribution. This parameter change optimizes the effective utilization of each element, achieving enhanced system capacity with fewer total elements, which directly reduces power consumption and computational requirements.
3Quantity of substance
If regular array RIS architecture is used, then the manufacturing and deployment is straightforward, but the spectral efficiency is limited
Solution Approach 1:
The patent employs asymmetry in the spatial arrangement of RIS elements to enhance spectral efficiency. The irregular sparse configuration creates more diverse signal paths and improves multiplexing capabilities, allowing more data to be transmitted through the same physical medium, thereby increasing spectral efficiency without requiring a proportional increase in hardware complexity.
Solution Approach 2:
The patent transitions from uniform two-dimensional regular grid arrangement to irregular sparse distribution that effectively utilizes spatial dimensions. This dimensional reorganization allows elements to be positioned for optimal signal reflection angles and paths, enhancing spectral efficiency by better exploiting the three-dimensional propagation environment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution improves spectral efficiency and adaptability to varying channel conditions without increasing the number of RIS elements, achieving quasi-optimal performance with low complexity and reduced power consumption.
Implementation Method 1
RISs are typically reflector surfaces which comprise multiple reflective elements. The reflective elements can be adjusted so as to allow for a signal which is being reflected off of the surface to be directed.
Data Source
AI summary
A reflective surface for directing wireless communications signals that includes a plurality of independently reconfigurable elements disposed irregularly on the surface is disclosed. A method of controlling a communication channel of a wireless communication system that includes the reflective surface having an irregular element arrangement is also disclosed.