Envelope Delay Adjustment Using Time-Domain ACLR Calibration
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Solution Overview
Problem
Existing wireless communication devices face challenges in achieving real-time adjustment of envelope delay amounts for optimal transmission performance, as current methods require complex calibration operations that are not feasible in real-time due to limitations in measuring adjacent channel leakage ratios, particularly in the frequency domain.
Innovation Solution
A wireless communication device is designed with a time domain-based measurement circuit and a feedback path circuit that allows for real-time adjustment of envelope delay amounts by generating an adjacent channel leakage ratio in the time domain, simplifying the calibration process and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency domain measurement using FFT-related blocks is used to measure adjacent channel leakage ratio, then measurement capability is provided, but real-time measurement is not possible and device complexity increases
Solution Approach 1:
The patent replaces the frequency domain measurement approach (using FFT-related blocks) with a time domain measurement approach. Specifically, it substitutes the complex frequency domain processing mechanism with a time domain signal processing mechanism that uses a time domain-based measurement circuit to directly measure the adjacent channel leakage ratio without requiring FFT transformation, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent introduces a time domain-based measurement circuit as an intermediary component that directly measures the adjacent channel leakage ratio in the time domain. This intermediary circuit avoids the need to use FFT-related blocks originally designed for frequency domain analysis, simplifying the overall system architecture and enabling real-time measurement without the computational overhead of frequency domain transformation
2Manufacturing precision
If calibration operation is performed in mass production stage using feedback path circuit, then envelope delay amount can be adjusted, but real-time adjustment is not possible after production
Solution Approach 1:
The patent makes the envelope delay amount adjustable in real-time by implementing a dynamic adjustment mechanism. The processor can modify the envelope delay amount based on real-time measurements of the adjacent channel leakage ratio, allowing the system to adapt to changing conditions after production rather than being fixed at the manufacturing stage. This transforms a static calibration parameter into a dynamic adjustable parameter
Solution Approach 2:
The patent implements a real-time feedback mechanism where the time domain-based measurement circuit continuously measures the adjacent channel leakage ratio, and the processor uses this feedback information to dynamically adjust the envelope delay amount. This closed-loop feedback system enables real-time optimization of transmission performance without requiring repeated calibration operations or external intervention
3Ease of manufacture
If FFT-related blocks of reception path circuit are used for measurement, then existing hardware can be utilized, but additional operations are required and debugging becomes complicated
Solution Approach 1:
The patent substitutes the frequency domain measurement mechanism (FFT-related blocks) with a time domain measurement mechanism. This replacement eliminates the need for complex software operations such as cyclic prefix removal and symbol synchronization that are required when using FFT blocks, thereby reducing software complexity and debugging difficulties while maintaining hardware utilization
Data Source
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AI summary
A wireless communication device includes: a transmission path circuit configured to generate a radio frequency (RF) output signal, based on a transmission signal and a supply voltage tracking an envelope signal; a feedback path circuit configured to be connected to the transmission path circuit so as to receive the RF output signal as a feedback signal, when switching from normal mode to calibration mode; a time domain-based measurement circuit configured to generate, in the calibration mode, an adjacent channel leakage ratio for a reception signal based on a time domain; and at least one processor configured to adjust, in the calibration mode, an envelope delay amount for the envelope signal, based on the adjacent channel leakage ratio.