Codebook Phase Adjustment for Non-Linear Antenna Arrays
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Solution Overview
Problem
Existing codebooks in mobile communication systems are specialized for uniform linear antenna arrays and cannot effectively adapt to non-linear antenna arrays, such as cylindrical arrays, which are useful in small cell environments, leading to inefficiencies in beamforming.
Innovation Solution
A new codebook is proposed that sets phase differences between adjacent elements differently based on phase parameters and compensation parameters, allowing for dynamic adaptation to non-linear antenna arrays, with parameters determined by the azimuth angle and element order, enabling flexible application in various channel environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a codebook specialized for uniform linear antenna arrays is used, then the codebook structure is simple and easy to implement, but it cannot effectively adapt to non-linear antenna arrays such as cylindrical arrays
Solution Approach 1:
The patent applies parameter changes by modifying the phase difference parameters in the codebook to accommodate non-linear antenna array geometries. Specifically, the phase difference between adjacent elements is adjusted based on the actual spatial configuration of the antenna elements, allowing the codebook to adapt to cylindrical and other non-linear arrangements while maintaining a structured format that avoids excessive complexity
Solution Approach 2:
The patent implements dynamics by making the codebook configurable and adaptable to different antenna array configurations. The codebook can be dynamically adjusted based on the specific geometry of the antenna array being used, enabling it to transition between different array types (linear, cylindrical, etc.) without requiring completely separate codebook designs
2Reliability
If phase differences between adjacent elements are set differently based on phase parameters and compensation parameters, then beamforming performance in non-linear arrays is improved, but calculation and configuration complexity increases
Solution Approach 1:
The patent uses parameter changes by introducing specific phase parameters and compensation parameters that can be adjusted to match the antenna array geometry. These parameters are determined based on the spatial relationships between antenna elements and are used to calculate the appropriate phase differences, thereby improving beamforming accuracy for non-linear arrays while providing a systematic method to manage the complexity
Solution Approach 2:
The patent applies self-service by enabling the system to automatically determine and configure the phase parameters based on the antenna array configuration. The base station can autonomously calculate the required phase differences and compensation parameters based on the known geometry of the antenna elements, reducing manual configuration complexity while maintaining high beamforming reliability
Data Source
AI summary
A method for transmitting and receiving signals based on a codebook in a multi-antenna wireless communication system, the method comprising: transmitting a channel state information reference signal (CSI-RS); and reporting channel state information to the base station; Wherein the channel state information includes a Precoding Matrix Indicator (PMI) for indicating a specific code vector among a plurality of code vectors included in the codebook, the codebook being included in each code vector And a phase difference between adjacent elements may be set to be different from each other.