RIS Weight Vector Selection for Spatial Multiplexing Throughput
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining suitable weight vectors for reconfigurable intelligent surfaces (RIS) to support spatially multiplexed communications with multiple layers per polarization, especially in blocked or weak line-of-sight links.
Innovation Solution
The selection of weight vectors from a plurality of stored vectors for a RIS to enable spatially multiplexed communications with two or more layers per polarization, allowing the RIS to function as convex, concave, or flat mirrors, adjusting coverage area, orientation, and beam width for improved communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weight vectors are selected for RIS to support spatially multiplexed communications with multiple layers per polarization, then communication throughput is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple weight vectors in the RIS device before actual communication occurs. These weight vectors are prepared in advance to correspond to different spatial multiplexing configurations, allowing the RIS to quickly switch between them during operation without performing complex real-time calculations, thus improving throughput while managing system complexity
Solution Approach 2:
The patent utilizes parameter changes by varying the weight vector parameters stored in the RIS to adapt to different spatial multiplexing scenarios. By changing the weight vector parameters (amplitude and phase coefficients) based on communication requirements, the system can support multiple layers per polarization and adjust to different channel conditions, thereby improving communication throughput
2Power
If RIS is configured to enable spatially multiplexed communication with two or more layers per polarization, then received power is increased, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple weight vectors in the RIS that correspond to different spatial multiplexing configurations. These weight vectors are stored in advance and can be selected based on channel conditions, allowing the RIS to achieve high received power through proper beamforming without requiring complex real-time optimization capabilities
Solution Approach 2:
The patent implements dynamics by enabling the RIS to dynamically switch between different pre-stored weight vectors based on varying channel conditions and communication requirements. This dynamic selection allows the system to adapt to changing environments and maintain high received power while avoiding the complexity of real-time weight vector optimization
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
Enables beam sweeping and enhances communication throughput by selecting appropriate weight vectors for RIS, increasing received power and improving spatially multiplexed communication performance.
Implementation Method 1
a reconfigurable intelligent surface (RIS) that is configured to enable a spatially multiplexed communication, between the transmitter and a receiver
Implementation Method 2
selecting a weight vector, from a plurality of stored weight vectors, for a reconfigurable intelligent surface (RIS) that is configured to enable a spatially multiplexed communication
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a reconfigurable intelligent surface (RIS) may select a weight vector, from a plurality of stored weight vectors, for enabling a spatially multiplexed communication, between a transmitter and a receiver, that includes two or more layers for each polarization of a plurality of polarizations for the spatially multiplexed communication. The RIS may receive the spatially multiplexed communication from the transmitter. The RIS may transmit the spatially multiplexed communication to the receiver in accordance with the weight vector. Numerous other aspects are described.