Dual Polarized Antenna Array Beam Generation
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Solution Overview
Problem
Current MIMO systems face challenges with phase and amplitude errors in generating broadcast beams, which affect the stability and characteristics of the beams, leading to system imbalances and inefficiencies.
Innovation Solution
The apparatus selects dual polarized antenna elements from different halves of the antenna element array and feeds them with broadcast beam signals of orthogonal polarizations, ensuring symmetric arrangement and minimizing phase and amplitude changes, thereby generating robust broadcast beams with reduced zeros in the radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional MIMO systems transmit broadcast beams using all antenna elements, then the output power is maximized, but phase and amplitude errors occur leading to beam instability
Solution Approach 1:
The antenna element array is divided into two sub-arrays, where the first sub-array transmits the first broadcast beam and the second sub-array transmits the second broadcast beam. This segmentation allows each sub-array to independently manage its signal transmission, reducing the impact of phase and amplitude errors on overall beam stability while maintaining high output power through coordinated transmission from both sub-arrays.
2Area of stationary object
If broadcast beams are generated using dedicated logical antenna ports, then the cell coverage area is defined, but the beams are sensitive to phase and amplitude calibration errors
Solution Approach 1:
The system transmits the same broadcast signal through two different sub-arrays with potentially different phase and amplitude characteristics. By changing the transmission parameters (which sub-array transmits which beam) and using orthogonal polarizations, the system maintains consistent cell coverage area definition while becoming insensitive to calibration errors in any single sub-array, as the other sub-array compensates for the errors.
3Reliability
If the antenna array is divided into sub-arrays for different functions, then robustness against errors is improved, but the device complexity increases
Solution Approach 1:
Each sub-array is designed to be multi-functional, capable of transmitting broadcast beams with orthogonal polarizations. The first sub-array can transmit both first-polarization and second-polarization broadcast beams, as can the second sub-array. This universality allows the system to achieve robustness against phase and amplitude errors through functional redundancy without requiring completely separate dedicated hardware for each function, thereby limiting the increase in device complexity.
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 results in broadcast beams that are insensitive to phase and amplitude changes, maintaining stability and efficiency even under phase and amplitude errors, and ensures consistent performance across different user positions.
Implementation Method 1
generate a first broadcast beam by feeding with a first broadcast beam signal the first set of dual polarized antenna elements at a first input for a first polarization and the second set of dual polarized antenna elements at a second input for a second polarization
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
The present invention relates to an apparatus for generating broadcast beams, configured to select out of an antenna element array, a first set of dual polarized antenna elements and a third set of dual polarized antenna elements each being arranged in a different half of the antenna element array select out of the antenna element array a second set of dual polarized antenna elements and a fourth set of dual polarized antenna elements each being arranged in a different half of the antenna element array generate a first broadcast beam by feeding with a first broadcast beam signal the first set of dual polarized antenna elements at a first input for a first polarization and the second set of dual polarized antenna elements at a second input for a second polarization generate a second broadcast beam by feeding with a second broadcast beam signal the third set of dual polarized antenna elements at a first input for the first polarization and the fourth set of dual polarized antenna elements at a second input for the second polarization wherein the second polarization is orthogonal to the first polarization.