Transmit Channel Impedance Tuning for EMC Noise Control
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Solution Overview
Problem
Wireless communication terminals, such as mobile phones, often fail to maintain electromagnetic compatibility performance in complex and changeable real-world scenarios due to varying load impedance of the power amplifier, leading to increased receive band noise and harmonic signals, which are not adequately addressed by existing test specifications.
Innovation Solution
A wireless signal performance adjustment apparatus and method that monitors the transmitting channel in real-time, adjusts the power amplifier, and tunes the antenna matching to optimize load impedance, reducing electromagnetic interference and improving electromagnetic compatibility performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication terminals are designed to meet electromagnetic compatibility test specifications, then they pass standard tests, but they fail to maintain electromagnetic compatibility performance in complex and changeable real-world scenarios
Solution Approach 1:
The patent implements dynamic adjustment of power amplifier output impedance through real-time monitoring and control. The system continuously monitors transmission channel signals and adjusts the power amplifier's operating parameters dynamically to maintain optimal electromagnetic compatibility performance across varying real-world scenarios, transitioning from static test-condition optimization to dynamic adaptive performance maintenance.
Solution Approach 2:
The patent establishes a feedback control loop that monitors transmission channel signals and uses this information to adjust power amplifier parameters. The monitoring unit detects signal characteristics, and the control unit processes this feedback to generate adjustment commands for the power amplifier, creating a closed-loop system that continuously optimizes electromagnetic compatibility performance based on actual operating conditions.
2Adaptability or versatility
If power amplifier load impedance varies in real-world usage, then the terminal adapts to different scenarios, but receive band noise and harmonic signals increase, degrading electromagnetic compatibility
Solution Approach 1:
The patent changes the operating parameters of the power amplifier by adjusting its output impedance through control signals. The system modifies key parameters such as voltage standing wave ratio and power output based on monitored transmission channel conditions, thereby controlling the generation of harmful electromagnetic signals while maintaining adaptability to different usage scenarios.
Solution Approach 2:
The patent converts the potentially harmful effect of power amplifier impedance variation into a beneficial control mechanism. By monitoring the transmission channel and using this information to adjust impedance dynamically, the system transforms what would otherwise be uncontrolled harmful variations into a controlled adaptation mechanism that maintains electromagnetic compatibility while preserving scenario adaptability.
Data Source
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AI summary
Disclosed are a wireless signal performance adjustment apparatus and method, and a wireless communication terminal. The wireless signal performance adjustment apparatus comprises a monitoring unit, a control unit, a measurement unit and an adjustment unit. The monitoring unit is configured to monitor a radio frequency signal of a transmitting channel; the control unit is configured to receive the radio frequency signal from the transmitting channel, control the measurement unit to perform measurement if the radio frequency signal does not meet a performance requirement condition, and determine adjustment information according to load impedance of a power amplifier in the transmitting channel; the measurement unit is configured to measure the load impedance under the control of the control unit; and the adjustment unit is configured to adjust the transmitting channel according to the adjustment information under the control of the control unit, so that the radio frequency signal meets the performance requirement condition.