Envelope Detection Using FPGA Digital Signal Processing
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Solution Overview
Problem
Existing envelope detection methods face challenges in reducing circuit complexity while effectively detecting sophisticated envelopes, particularly in low-complexity schemes using analog circuits.
Innovation Solution
The method employs a Sequential Envelope Detection (SED) approach that calculates envelope component values by squaring and multiplying sampled signals, allowing for accurate envelope detection with reduced circuit complexity and adjustable sampling intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing is performed using band-pass filter or low-pass filter in frequency band, then envelope detection accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent replaces traditional analog filtering circuits (band-pass filters, low-pass filters) with a digital signal processing approach using a field-programmable gate array (FPGA). The FPGA performs envelope detection through digital operations including Hilbert transform and analytic signal processing, substituting complex analog circuitry with reconfigurable digital logic that achieves equivalent or superior detection accuracy without the physical complexity of analog filter components.
2Device complexity
If low complexity schemes using analog circuits such as diode and capacitor are used, then circuit complexity is reduced, but envelope detection capability deteriorates
Solution Approach 1:
The patent replaces simple analog envelope detectors (diode-capacitor circuits) with an FPGA-based digital signal processing system. The FPGA implements sophisticated algorithms including the Hilbert transform and analytic signal methods that can accurately detect complex envelope structures that simple analog circuits cannot handle, while maintaining low physical complexity through integrated digital logic.
Solution Approach 2:
The patent changes the operating parameters and detection methods by transitioning from fixed analog circuit characteristics to reconfigurable digital processing. The FPGA can dynamically adjust detection parameters, sampling rates, and processing algorithms to match different signal characteristics, enabling accurate detection of sophisticated envelopes that static analog circuits cannot adapt to.
3Measurement precision
If sophisticated envelope detection is achieved, then measurement precision is improved, but circuit complexity increases
Solution Approach 1:
The patent achieves sophisticated envelope detection by substituting complex analog circuit implementations with a unified digital signal processing architecture in an FPGA. The digital implementation of the Hilbert transform, analytic signal generation, and envelope extraction algorithms provides high detection accuracy for complex modulated signals while consolidating multiple functions into a single reconfigurable device, reducing overall system complexity compared to implementing each function with separate analog circuits.
Data Source
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AI summary
A method and apparatus for detecting an envelope are provided. The method and apparatus may detect an envelope of a modulating signal based on a low calculation complexity and a simple circuit configuration, by detecting an envelope for a plurality of sampling signals with equal time interval