Array Antenna TRP Measurement Using Rayleigh Resolution Sampling
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Solution Overview
Problem
Traditional TRP measurement methods for millimeter wave massive-MIMO array antennas in 5G base stations suffer from large measurement errors and low efficiency due to the use of 15° angle stepping grids, which do not accurately reflect the radiated power and require excessive sampling points.
Innovation Solution
Implementing a method that uses uniform and non-uniform sampling schemes, including a uniform sampling scheme in the angle space and a non-uniform sampling scheme in the normalized wave vector space, to reduce measurement errors and improve efficiency by setting stepping grid spacings based on Rayleigh resolutions or first null beamwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional 15° angle stepping grids are used for TRP measurement, then the measurement process is simple and fast, but the measurement precision deteriorates with large errors
Solution Approach 1:
The patent changes the sampling parameters from fixed 15° grids to adaptive sampling based on Rayleigh resolutions and first null beamwidths. By calculating the actual beamwidth characteristics of the antenna array and determining optimal sampling intervals accordingly, the system achieves both accuracy and efficiency without requiring excessive sampling points
Solution Approach 2:
The patent introduces dynamic sampling adjustment where the sampling grid is not fixed but adapts to the specific antenna array characteristics. The system dynamically determines sampling intervals based on the array's geometric configuration and operating frequency, allowing optimal measurement settings for each specific case
2Ease of operation
If 15° angle stepping grids are used, then the measurement process is straightforward, but the number of sampling points becomes excessive reducing efficiency
Solution Approach 1:
The patent optimizes the sampling parameters by replacing the fixed 15° grid with dynamic sampling intervals derived from Rayleigh resolutions. This calculation-based approach determines the minimum necessary sampling points to achieve accurate TRP measurement, eliminating redundant samples while maintaining measurement reliability
Solution Approach 2:
The patent applies partial sampling by selectively measuring only at critical angles where the antenna array produces significant radiation patterns. By identifying and sampling at these key directions based on the array's geometric characteristics, the system achieves accurate TRP without requiring complete coverage at all angles
Data Source
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AI summary
Provided are a method, apparatus and system for measuring total radiated power of an array antenna. The method includes: determining a Rayleigh resolution of the array antenna in an angle space, and setting a stepping grid spacing of sampling points according to the Rayleigh resolution; determining the sampling points according to the stepping grid spacing, measuring equivalent isotropic radiated power (EIRP) at positions of the sampling points, and determining the TRP according to the EIRP. Compared with a traditional test mode using an angle stepping grid θgrid and ϕgrid of 15°, this reduces measurement errors; and additionally, through a normalized wave vector space transformation, the number of sampling points is further reduced, and the measurement efficiency is improved.