Beamforming Phase Correction Circuit for RF Coherency Loss
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Solution Overview
Problem
Existing wireless communication circuits experience phase coherency loss in RF beams due to impedance changes caused by temperature fluctuations in power amplifier circuits and antenna arrays, leading to reduced receivability.
Innovation Solution
A phase correction circuit with lookup tables and phase shifters is employed to determine and apply phase correction terms to processed signals, restoring phase coherency by compensating for phase changes in the RF beamforming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifier circuits and antenna arrays operate at high power, then communication performance is improved, but temperature fluctuations cause impedance changes leading to phase coherency loss
Solution Approach 1:
The system performs preliminary calibration to measure and store phase correction terms in lookup tables before actual operation. During high-power transmission, the pre-calibrated lookup tables provide immediate phase correction without requiring real-time computation, thus maintaining phase coherency while operating at high power levels
Solution Approach 2:
The system implements feedback through lookup tables that store pre-determined phase correction terms based on temperature or power level conditions. When operating conditions change, the system retrieves appropriate correction terms from the lookup tables and applies them to compensate for impedance changes, maintaining phase coherency dynamically
2Measurement precision
If phase correction terms are calculated in real-time, then phase accuracy is improved, but processing time and complexity increase
Solution Approach 1:
Phase correction terms are pre-calculated and stored in lookup tables during a calibration phase. During actual operation, the system simply retrieves the appropriate correction terms from the lookup tables based on current operating conditions, avoiding time-consuming real-time calculations while maintaining high phase accuracy
Solution Approach 2:
The system uses dynamic lookup tables that can be updated or reconfigured based on operating conditions. The lookup tables provide fast access to phase correction terms while allowing the system to adapt to changing conditions by selecting appropriate pre-calculated values, balancing speed and accuracy
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
The solution ensures phase coherency in RF beams, enhancing receivability at the receiving end by correcting undesired phase changes.
Implementation Method 1
Each of the multiple phase shifters is configured to phase shift the respective one of the multiple processed signals by a combination of the respective one of the multiple predefined phases and the respective one of the multiple phase correction terms
Data Source
AI summary
Beamforming phase correction in a wireless communication circuit is provided. The wireless communication circuit is configured to emit multiple processed signals, which are generated by applying a codeword to a radio frequency (RF) signal. The codeword defines a set of complex-valued coefficients that will cause each of the processed signals to be associated with a respective one of multiple defined phases such that the processed signals can form an RF beam when emitted simultaneously from multiple antenna elements. However, some or all of the defined phases can be changed, for example, when the processed signals are amplified. In this regard, in embodiments disclosed herein, a phase correction circuit is configured to determine one or more phase correction terms and apply the determined phase correction terms to one or more of the processed signals to thereby correct undesired phase changes and restore coherency among the processed signals.