Beamforming Phase Correction for Temperature-Shifted Antenna Impedance
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Solution Overview
Problem
Temperature fluctuations in mobile communication devices' circuitry and antennas cause impedance variations, leading to degraded beam steering performance in 5G-NR systems, which negatively impact data rates and compliance with cellular standards.
Innovation Solution
Incorporating power detectors between power amplifiers and antennas to measure power amplitudes, evaluating the sum and difference of these amplitudes to determine phase differences, and adjusting phases to equalize them, thereby generating a correction signal for the beamforming circuit to improve beamforming performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming circuits assume constant impedance at antennas, then beam steering performance can be maintained under ideal conditions, but temperature fluctuations cause impedance variations that degrade performance
Solution Approach 1:
The patent implements a feedback mechanism where power detectors continuously monitor the power levels at the antenna outputs, and the system adjusts the phase shifters based on these measurements to compensate for impedance variations caused by temperature fluctuations, thereby maintaining reliable beam steering performance
Solution Approach 2:
The system dynamically changes the phase parameters of the beamforming circuit based on detected power levels, adjusting the phase shift values in response to temperature-induced impedance variations to maintain optimal beam steering performance
2Reliability
If power detectors are added to measure power amplitudes for phase correction, then beamforming performance is improved, but device complexity increases
Solution Approach 1:
The power detectors are integrated into the existing beamforming circuit architecture, serving dual purposes of power monitoring and phase correction control, thereby reducing the need for separate dedicated components and minimizing overall device complexity
Solution Approach 2:
The system uses its own output signals to generate correction information through the power detectors and phase evaluation logic, creating a self-regulating mechanism that eliminates the need for external calibration equipment or additional control systems
Data Source
AI summary
A transmitter apparatus that performs beamforming with phase correction uses power detectors present between power amplifiers (PAs) and antennas are used to measure power amplitudes on at least two transmission paths. The sum and difference of these amplitudes are then evaluated to determine a phase difference therebetween. A phase of one signal contributing to the sum and difference may be modified until the sum and difference are the same. Based on an amount of phase modification, a correction signal may be sent to a beamforming circuit to provide phase correction during beamforming.