Envelope Tracking Delay Calibration Using Time-Domain ACLR Feedback
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Solution Overview
Problem
Existing wireless communication devices face challenges in achieving real-time adjustment of envelope delay amounts for optimal power consumption and transmission performance, as current methods require complex calibration operations that are not feasible in real-time due to limitations in feedback path circuit usage and measurement complexity.
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 reducing complexity compared to frequency domain measurements.
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 device complexity and operation complexity increase significantly
Solution Approach 1:
The patent replaces the frequency domain measurement approach (using FFT blocks) with a time domain measurement approach. Specifically, it uses a time domain-based measurement circuit that includes a delay element, a multiplier, and an integrator to directly measure the adjacent channel leakage ratio in the time domain, eliminating the need for complex FFT processing and cyclic prefix removal operations.
Solution Approach 2:
The patent changes the measurement domain parameter from frequency domain to time domain. By measuring the adjacent channel leakage ratio directly in the time domain using correlation-based methods, the system avoids the computational complexity of frequency domain transformation while maintaining measurement accuracy.
2Measurement precision
If FFT-related blocks of reception path circuit are used for calibration, then adjacent channel leakage ratio can be measured, but ease of operation deteriorates due to additional operations required
Solution Approach 1:
The patent substitutes the complex frequency domain measurement process with a simpler time domain measurement process. The time domain-based measurement circuit performs direct correlation measurement without requiring cyclic prefix removal, synchronization, or FFT operations, significantly simplifying the calibration procedure.
3Manufacturing precision
If feedback path circuit is used for mass production calibration, then envelope delay amount can be adjusted, but productivity decreases due to limited feedback path availability
Solution Approach 1:
The patent replaces the iterative frequency domain measurement and adjustment process with a direct time domain measurement approach. This allows for faster convergence and more efficient calibration during mass production, improving productivity while maintaining the precision of envelope delay adjustment.
Data Source
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.