Phase Shift Correction in Wireless Communication Devices
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Solution Overview
Problem
Wireless communication devices face issues with phase shifts due to changes in RF gain, bias, and load, leading to magnitude measurement errors, differential non-linear errors, and degradation of power accuracy, adjacent channel leakage ratio, and error vector magnitude, potentially causing dropped calls and performance degradation.
Innovation Solution
A method for estimating and correcting phase shift in wireless communication devices by converting digital signals into compensated signals based on calculated phase errors, using a phase compensator and phase error estimation path to calculate and correct absolute and relative phase variations, and updating phase compensation tables based on operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase shift correction is implemented in real-time, then phase accuracy and power transmission accuracy are improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent pre-calculates and stores phase error values in lookup tables during device initialization or calibration phases. During operation, the system retrieves pre-computed phase correction values based on measured RF gain, bias, and load conditions, avoiding complex real-time calculations while maintaining high phase accuracy.
Solution Approach 2:
The patent replaces complex real-time phase calculation algorithms with simplified lookup table-based retrieval systems. Instead of performing intensive mathematical computations during signal processing, the system substitutes these with efficient table lookups and interpolation operations, reducing computational burden while preserving phase correction effectiveness.
2Manufacturing precision
If phase compensation is performed continuously, then power accuracy and EVM are improved, but energy consumption increases
Solution Approach 1:
The patent implements phase compensation at specific intervals or triggered by significant changes in operating conditions (RF gain, bias, load) rather than continuously. The system monitors parameter changes and activates phase correction only when thresholds are exceeded, reducing unnecessary computational energy consumption while maintaining power accuracy.
Solution Approach 2:
The patent adjusts the aggressiveness of phase compensation based on operating conditions. Under stable conditions with minor parameter variations, the system reduces compensation frequency or intensity. When significant parameter changes occur, full phase compensation is activated, optimizing the balance between power accuracy and energy consumption.
3Measurement precision
If phase error calculation is performed for every signal, then phase correction accuracy is improved, but processing time and computational load increase
Solution Approach 1:
The patent pre-computes phase error values and stores them in lookup tables organized by RF gain, bias, and load conditions. During signal processing, the system retrieves pre-calculated phase error values corresponding to current operating parameters, eliminating the need for repeated complex phase error calculations while maintaining high correction accuracy.
Solution Approach 2:
The patent uses lookup tables that contain copies of phase error data for various operating conditions. Instead of recalculating phase errors from first principles for each signal, the system copies relevant phase error values from the lookup table based on current parameters, significantly reducing computational load while preserving accuracy.
Data Source
AI summary
In accordance with some embodiments of the present disclosure, a method for estimating and correcting phase shift in a wireless communication device, may include converting a digital signal output by digital circuitry of the wireless communication device into a compensated digital signal based on a calculated phase error. The method may also include converting the compensated digital signal into a wireless communication signal. The method may additionally include calculating an estimated instantaneous reference phase of the digital signal output by the digital circuitry. The method may further include calculating an estimated transmit phase of the wireless communication signal. Moreover, the method may include calculating a phase error based on a difference between the estimated instantaneous reference phase and the estimated transmit phase of the wireless communication signal.