RIS Precoder Structure for Sub-Terahertz Relay Coverage
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Solution Overview
Problem
The use of sub-terahertz bands in future radio communication systems, such as 6G, faces challenges in achieving high data rates and wide coverage due to limitations in existing MIMO technologies, which are not suitable for access links and require large antenna arrays, leading to degraded communication quality and throughput.
Innovation Solution
The implementation of a Reconfigurable Intelligent Surface (RIS) with a precoder design that decouples angle and distance-dependent terms, using a combination of matrices to enhance beamforming and signal transmission in both near and far fields, allowing for CSI-free transmission and robust communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing MIMO technologies are used in sub-terahertz bands, then high data rates can be achieved, but coverage is limited and communication quality degrades
Solution Approach 1:
The patent segments the precoder into two separate matrices: a first matrix based on angle information and a second matrix based on distance information. This segmentation allows independent optimization of each matrix component, enabling the system to achieve high data rates through precise beamforming while maintaining communication quality by separately controlling directional and distance-dependent signal characteristics in sub-terahertz bands.
2Area of stationary object
If large antenna arrays are deployed to extend coverage, then coverage area increases, but device complexity and cost increase
Solution Approach 1:
The patent changes the approach from increasing physical antenna array size to optimizing signal parameters through a two-matrix precoder structure. By utilizing angle information for the first matrix and distance information for the second matrix, the system can extend coverage to 100 meters and achieve 100 Gbps data rates without requiring proportionally larger antenna arrays, thereby reducing device complexity while maintaining extended coverage capability.
3Ease of manufacture
If conventional beamforming is used, then implementation is simple, but interference reduction and power efficiency are insufficient
Solution Approach 1:
The patent segments the beamforming precoder into angle-based and distance-based matrices, which maintains implementation feasibility while significantly improving power efficiency. The angle-based first matrix provides directional beamforming capability, and the distance-based second matrix optimizes signal strength at different ranges, together reducing interference and enabling 100 Gbps transmission with lower power consumption compared to conventional single-matrix beamforming approaches.
Data Source
Figure 1A~1B
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AI summary
A relay apparatus according to one aspect of the present disclosure includes a receiving section that receives angle information and distance information related to a terminal, and a control section that determines, based on at least one of the angle information and the distance information, a precoder to be applied to a signal directed to the terminal, the precoder being calculated based on multiplication of a first matrix and a second matrix. According to one aspect of the present disclosure, it is possible to appropriately perform communication in a radio communication system using a sub-terahertz band.