Digital Modulation Error Detection Circuit for Real-Time Triggering
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Solution Overview
Problem
Conventional signal analyzers are unable to effectively generate a trigger for detecting deterioration in modulation accuracy of digital modulation signals in real-time, especially when dealing with various amplitudes and phases, due to complex software processes that are difficult to implement using hardware like ASIC or FPGA at a low cost.
Innovation Solution
A digital modulation error detection circuit is introduced, which generates a trigger signal by evaluating shifts between symbol data, using measured and predicted values to detect errors within a preset acceptable range, and synchronizes symbol timing signals to maintain accurate detection, allowing for real-time monitoring of modulation errors across various digital modulation formats and symbol rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex software processes are used to detect modulation errors, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex software-based error detection with a hardware circuit implementation. The digital modulation error detection circuit uses parallel hardware components (adders, multipliers, comparators) to perform modulation error detection simultaneously, eliminating the need for complex sequential software processing while maintaining detection accuracy.
Solution Approach 2:
The error detection process is divided into separate functional hardware modules: symbol timing extraction unit, measured value acquisition unit, predicted value generation unit, comparison unit, and trigger generation unit. Each module performs a specific function in parallel, simplifying the overall system architecture while enabling real-time detection.
2Productivity
If real-time detection is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The circuit is segmented into specialized parallel processing units that each handle specific aspects of error detection simultaneously. This parallel hardware architecture enables real-time detection without requiring overly complex sequential processing logic.
Solution Approach 2:
The patent uses parallel computation paths where predicted values are generated using the same modulation format characteristics but with ideal phase relationships. This copying approach simplifies the comparison logic while enabling simultaneous real-time detection.
Data Source
AI summary
A modulation error is detected every symbol data to generate a trigger signal. The present invention focuses that there are limited patterns of shifts from one symbol data to the next one of the digital modulation signal. Measured values of amplitude, phase and/or frequency of symbol data are latched and then values at the next symbol timing are predicted from the latched measured values using said feature. The predicted and measured values are compared at the following symbol timing. If the difference (error) is over an acceptable range, a trigger signal is provided which allows acquiring a modulation error by symbol data.