Wireless Communication Device Phase Error Calibration Circuit
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Solution Overview
Problem
In wireless communication systems, phase errors due to manufacturing errors or environmental changes can deteriorate the accuracy of arrival angle estimation, especially when using antenna arrays, as internal propagation routes and antenna positions contribute to phase changes in received signals.
Innovation Solution
A wireless communication device with a transmission section, reception section, correction phase calculation circuit, and storage section is implemented, which outputs a calibration signal, receives and processes signals from multiple antennas, calculates correction phases to correct baseband signals based on deviations from ideal phases, and stores ideal and correction phases for improved arrival angle estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna arrays are used to estimate arrival angles, then the ability to receive and process radio waves is improved, but phase errors from manufacturing and environmental factors deteriorate estimation accuracy
Solution Approach 1:
The patent performs preliminary calibration by having each antenna receive a calibration signal from a calibration antenna, calculate the actual phase difference between antennas, and store this calibration data. This preliminary action allows the system to compensate for manufacturing errors and environmental factors before actual communication occurs, resolving the contradiction between using antenna arrays for accurate measurement and the phase errors that inevitably occur.
2Measurement precision
If internal propagation routes are used to connect antennas, then signal reception is enabled, but routing differences cause phase changes that reduce estimation accuracy
Solution Approach 1:
The patent implements feedback by measuring the actual phase differences between antennas during calibration and using this information to adjust subsequent signal processing. The system continuously monitors and corrects phase errors introduced by internal routing, transforming the complex routing issue into a manageable calibration problem that can be compensated for through feedback mechanisms.
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 solution enhances the accuracy of arrival angle estimation by correcting phase errors caused by antenna arrangement and internal routing differences, thereby improving the overall performance of the wireless communication system.
Implementation Method 1
the reception section has input of a received signal from an antenna that receives a calibration signal, and obtains a baseband signal from the received signal
Data Source
AI summary
A wireless communication device includes a transmission section configured to output a calibration signal transmitted from a calibration antenna, a reception section configured to have input of a received signal from an antenna and obtain a baseband signal from the received signal, a correction phase calculation circuit configured to calculate a correction phase for correcting the baseband signal according to a deviation between a reception phase calculated based on the baseband signal obtained when the antenna receives the calibration signal and an ideal phase associated with the antenna, and a storage section configured to store the ideal phase and the correction phase.