Reconfigurable Reflective Arrays for Multi-Stream Spatial Filtering
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Solution Overview
Problem
Existing re-configurable reflective devices (RRDs) face challenges in supporting multiple spatial data streams, particularly for passive antenna arrays, as they are limited by complex hardware requirements and inefficient codebook configurations.
Innovation Solution
The RRD is partitioned into subsets, with each subset having its own codebooks for steering and compensation vectors, allowing flexible reconfiguration of reflective elements to provide multiple spatial filters, enabling efficient separation and forwarding of spatial data streams without reducing spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single RRD is used to support multiple spatial data streams, then the coverage area and data transmission capacity are improved, but the hardware complexity and difficulty of configuration increase significantly
Solution Approach 1:
The RRD is divided into multiple subsets, with each subset independently configurable to support multiple spatial data streams. This segmentation allows the system to handle complex multi-stream transmission by breaking it down into manageable subset-level operations, reducing overall hardware complexity while maintaining high productivity
2Device complexity
If passive antenna arrays are used in RRD, then the device simplicity is improved, but the ability to support multiple spatial data streams deteriorates
Solution Approach 1:
The passive antenna array is made dynamically reconfigurable through subset-based phase shifting. Each subset can be independently configured to adapt to different spatial data stream requirements, enabling the simple passive array to support multiple spatial streams through dynamic reconfiguration rather than complex hardware
3Ease of operation
If codebook-based configuration is used for RRD, then the ease of operation is improved, but the computational complexity and spectral efficiency deteriorate
Solution Approach 1:
The codebook configuration is segmented into subset-level codebooks rather than requiring a single comprehensive codebook. This reduces the computational complexity of codebook determination and selection while maintaining ease of operation, as each subset uses its own simplified codebook for configuration
Solution Approach 2:
The system changes the parameter organization from a single large codebook to multiple smaller subset-specific codebooks. This parameter reorganization reduces computational complexity and improves spectral efficiency while preserving the ease of codebook-based operation
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
This approach supports a larger number of data streams with reduced computational complexity and maintains UE transparency, while avoiding time or bandwidth sharing, and allows for high-accuracy codebook determination.
Implementation Method 1
The RRD can be implemented by an array of antennas that reflect incident electromagnetic waves/signals
Data Source
AI summary
A method of operating a re-configurable reflective device, RRD (109) is provided. One or more wireless communication devices (102, 103, 104) are served by an access node (101) via the RRD (109) using multiple spatial data streams. The RRD (109) comprises multiple reflective elements (1094), the multiple reflective elements (1094) being grouped into a plurality of subsets (691-697), the multiple reflective elements (1094) of each subset (691-697) being re-configurable to provide multiple spatial filters. The method comprises obtaining, from the access node (101) and for each subset (691-697) of the plurality of subsets (691-697), a respective first indicator indicative of a respective entry of a respective first codebook and a respective second indicator indicative of a respective entry of a respective second codebook, and reconfiguring, for each subset (691-697) of the plurality of subsets (691-697), the respective multiple reflective elements (1094) to provide a respective one of the multiple spatial filters, based on the respective entry of the respective first codebook and the respective entry of the respective second codebook.