Rectangular Antenna Array LoS MIMO Precoder Decomposition
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Solution Overview
Problem
Wireless communication systems using rectangular antenna arrays face challenges in determining precoders for line-of-sight (LoS) multiple-input-multiple-output (MIMO) communications due to complex higher-order channel matrices, which require extensive processing capabilities and are computationally expensive, making them unsuitable for lower-complexity user equipment (UEs).
Innovation Solution
The technique involves decomposing higher-order channel matrices into smaller symmetric sub-matrices, allowing UEs to simplify the determination of precoders by leveraging symmetry, reducing computational complexity and enabling less expensive solving, and transmitting these precoders for LoS MIMO communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher-order channel matrices are used for LoS MIMO communications with rectangular antenna arrays, then communication accuracy is improved, but computational complexity increases excessively
Solution Approach 1:
The patent segments the higher-order channel matrix into multiple lower-order sub-matrices corresponding to different antenna array dimensions. By dividing the complex N×N channel matrix into smaller sub-matrices (e.g., M×M where M<N), the computational complexity is reduced while maintaining the ability to accurately represent the channel characteristics through the segmented structure.
Solution Approach 2:
The patent transforms the problem from solving a single higher-order matrix in one dimension to solving multiple lower-order matrices across different dimensional segments. This dimensionality change allows the system to exploit the rectangular antenna array structure (separating transmit and receive antenna dimensions) to reduce computational burden while preserving channel estimation accuracy.
2Reliability
If higher-order channel matrices are solved to determine precoders, then communication reliability is improved, but power consumption increases due to extensive processing
Solution Approach 1:
By segmenting the channel matrix into smaller sub-matrices, the patent reduces the computational operations required to determine precoders. Each sub-matrix requires fewer floating-point operations to solve, directly reducing power consumption while maintaining communication reliability through the combined information from all segments.
Solution Approach 2:
The patent applies partial action by solving only the necessary lower-order sub-matrices rather than the complete higher-order matrix. This partial computation approach achieves sufficient precision for reliable communication without the excessive power consumption required for full matrix solution.
3Productivity
If rectangular antenna arrays are used for LoS MIMO communications, then spectral efficiency is improved, but the number of eigenvectors to solve increases
Solution Approach 1:
The patent segments the eigenvector computation problem by decomposing the channel matrix into sub-matrices. Instead of computing all eigenvectors of the large N×N matrix, the system computes eigenvectors of smaller M×M sub-matrices, reducing the total number of eigenvectors that must be solved while maintaining spectral efficiency through the rectangular antenna array configuration.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device may receive a request for beamforming information associated with line-of-sight (LoS) multiple input multiple output (MIMO) communication from a second wireless device. The first wireless device may generate a channel estimation matrix for a channel between rectangular antenna arrays of the respective wireless devices, the channel estimation matrix including one or more quadratic terms for the LoS MIMO communication. The first wireless device may generate a first sub-matrix and a second sub-matrix based on the channel estimation matrix. The first wireless device may transmit an indication of a set of precoders for the LoS MIMO communication, the set of precoders based on a symmetry associated with the first and second sub-matrices, and may receive the LoS MIMO communication from the second wireless device based on the set of precoders.