Polar Modulator Feedback Correction for Amplitude Offset Errors
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Solution Overview
Problem
Polar modulators are sensitive to amplitude offsets, which result in increased error rates during data transmission due to unwanted DC components from leakage currents, affecting signal quality.
Innovation Solution
A polar modulator with a feedback path and correction device that uses a level detector to ascertain and correct amplitude offsets, reducing errors by adjusting the amplitude modulation word and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polar modulator is used for amplitude and phase modulation, then the modulator can directly digitally actuate phase and frequency modulation, but the modulator becomes sensitive to amplitude offsets which increase error rates
Solution Approach 1:
The patent implements a feedback path that includes a level detector connected to the output of the polar modulator. The level detector monitors the amplitude level and feeds back correction signals to compensate for amplitude offsets. This feedback mechanism directly addresses the reliability issue by continuously detecting and correcting amplitude errors that would otherwise increase error rates during data transmission.
Solution Approach 2:
The patent changes the operational parameters of the polar modulator by introducing adjustable gain control in the amplitude path. By dynamically adjusting the amplitude parameter based on detected offsets, the system maintains accurate amplitude modulation while preserving the direct digital actuation capability. This parameter adjustment allows the modulator to operate reliably despite inherent sensitivity to amplitude offsets.
2Device complexity
If amplitude offsets are present in the polar modulator, then the modulator can operate with simple structure, but unwanted DC components are generated which increase error rates
Solution Approach 1:
The patent extracts and separates the amplitude offset correction function from the main modulation path by implementing a dedicated feedback path with a level detector. This extraction allows the system to maintain the simple structure of the basic polar modulator while adding a specialized subsystem that specifically targets and removes the harmful DC components and amplitude offsets without complicating the overall modulator architecture.
Solution Approach 2:
The patent introduces an intermediary correction device in the feedback path that acts as a mediator between the level detector and the amplitude modulation input. This intermediary component processes the detected offset information and generates appropriate correction signals, effectively eliminating unwanted DC components while preserving the simplicity of the original modulator structure.
3Device complexity
If no correction mechanism is implemented, then the polar modulator operates with simple means, but amplitude errors cannot be corrected leading to increased error rates
Solution Approach 1:
The patent implements a feedback path that includes a level detector connected to the output of the polar modulator. The level detector monitors the amplitude level and feeds back correction signals to compensate for amplitude offsets. This feedback mechanism directly addresses the reliability issue by continuously detecting and correcting amplitude errors that would otherwise increase error rates during data transmission.
Solution Approach 2:
The polar modulator incorporates a self-correction capability through the feedback path and level detector, allowing the system to automatically detect and correct its own amplitude offsets without external intervention. This self-service approach improves signal quality and reliability while adding only minimal complexity through the feedback components.
Data Source
AI summary
A polar modulator contains a first input for supplying an amplitude modulation word and a second input for supplying a phase modulation word. The first input is connected to a first signal path, and the second input is connected to a second signal path. The polar modulator contains a converter having a first input which is connected to a first signal path and having a second input which is connected to the second signal path. In this case, the converter is configured to output a radio-frequency signal derived from the phase modulation word and the amplitude modulation word. A feedback path has a level detector connected to the converter and has its output side connected to a correction device. The correction device is designed to output a correction word to the first signal path on the basis of a signal which is output by the level detector.