3D Beamforming Precoding Matrix Segmentation for Vertical Optimization
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Solution Overview
Problem
The existing codebook designed for horizontal beam-forming/pre-coding in LTE systems degrades performance when directly applied to 3D beam-forming/pre-coding due to its inability to optimize vertical beam adjustments, which are crucial for improved spectrum efficiency in wireless communications.
Innovation Solution
A method and system that involve determining a pre-coding matrix by transmitting a first and second pre-coding indicator, where the pre-coding matrix is composed of a block diagonal matrix with sub-matrices as Kronecker products of diagonal matrices and beam-rotating vectors, allowing for better matching of 3D beam-forming channels and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing codebook designed for horizontal beam-forming is directly applied to 3D beam-forming, then the device complexity is reduced, but the system performance and spectrum efficiency deteriorate
Solution Approach 1:
The codebook is segmented into two independent components: a first codebook for horizontal beamforming and a second codebook for vertical beamforming. This segmentation allows each codebook to be optimized for its specific dimension, improving overall system performance while maintaining manageable complexity through modular structure.
Solution Approach 2:
The invention extends the traditional horizontal beamforming codebook by introducing a vertical dimension through a second codebook. This dimensionality change enables 3D beamforming capability, where the overall precoding matrix is formed by combining horizontal and vertical components, thereby improving spectrum efficiency without excessive complexity increase.
2Ease of operation
If a common vertical down tilt angle is used for every UE, then the ease of operation is improved, but the spectrum efficiency and system performance worsen
Solution Approach 1:
The vertical beamforming parameter is made dynamic and UE-specific through the second codebook. Instead of a fixed common tilt angle, each UE can be assigned a tailored vertical beamforming vector from the second codebook based on its channel characteristics, thereby optimizing spectrum efficiency while maintaining operational simplicity through automated selection.
Solution Approach 2:
The vertical tilt angle parameter is transformed from a fixed common value to a variable UE-specific parameter. By introducing a second codebook with multiple vertical beamforming vectors, the system can adapt the vertical beam parameters to match different UE positions and channel conditions, improving productivity without sacrificing ease of operation.
3Ease of manufacture
If the existing horizontal beam-forming codebook is used for 3D beam-forming, then the ease of manufacture is improved, but the measurement precision of channel state information worsens
Solution Approach 1:
The channel state information measurement is segmented into horizontal and vertical components, each measured and quantized using its dedicated codebook. This segmentation allows precise measurement of 3D channel characteristics while maintaining ease of implementation through modular codebook structures that can be independently designed and optimized.
Solution Approach 2:
The channel state information measurement is extended from 2D horizontal to 3D by incorporating vertical dimension through the second codebook. This dimensionality change enables precise measurement of vertical channel variations, improving measurement precision while maintaining ease of manufacture through the use of structured codebook-based quantization methods.
Data Source
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AI summary
An embodiment of the present application relates to the technical field of wireless communications, in particular to a method, system and device for transmitting pre-coded indication information and determining a pre-coding matrix. In the prior art, the existing codebook is designed for horizontal beamforming/pre-coding, and will reduce the performance thereof if directly applied in three-dimensional beamforming/pre-coding technique. The present application solves the problem. The method in the embodiment of the present application comprises: a user equipment (UE) determines and transmits first pre-coded indication information and second pre-coding indication information, the pre-coding matrix being equal to the function matrix of a first component pre-coding matrix and a second component pre-coding matrix, a sub-matrix on the diagonal of the first component pre-coding matrix being the Kronecker product of two diagonal matrixes, the second component pre-coding matrix being formed by a beam rotation vector equaling to the Kronecker product of two vectors. The embodiment of the present application improves the performance of the three-dimensional beamforming/pre-coding technique.