Reception Device Nonlinear Distortion Compensation
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Solution Overview
Problem
Broadcasting standards like DVB-S2 and DVB-S2X do not transmit known signals of the same constellation as the data section, making it difficult to compensate for nonlinear distortion in reception signals, which degrades reception performance.
Innovation Solution
A reception device and method that generates distortion information by averaging signal points of the same constellation, allowing for nonlinear distortion compensation even without known signals of the same constellation, using a configuration that includes orthogonal detection, equalization, and LDPC encoding/decoding units to improve reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known signals of the same constellation are transmitted to enable distortion compensation, then reception performance is improved, but the broadcasting standard cannot be followed (DVB-S2/DVB-S2X)
Solution Approach 1:
The invention creates a virtual copy of the constellation structure by generating imaginary signal points based on the decoded data. Instead of requiring actual known signals to be transmitted, the system reconstructs the expected constellation pattern from the decoded information, allowing distortion compensation without adding extra transmission signals.
Solution Approach 2:
The system uses its own decoded output to generate the distortion compensation reference. By feeding the decoded data back through the modulation process to recreate the constellation, the system becomes self-sufficient and does not require external known signals, thus maintaining compatibility with DVB-S2/DVB-S2X standards.
2Adaptability or versatility
If no known signals are transmitted, then broadcasting standard compatibility is maintained, but distortion compensation becomes difficult
Solution Approach 1:
The decoded data acts as an intermediary element that bridges the gap between the received signal and the needed reference constellation. By using the decoded information to generate imaginary signal points, the system creates a mediator that enables distortion compensation without requiring direct transmission of known signals.
3Loss of information
If outer circumference signal points are used, then more amplitude information is available, but amplitude/phase distortion increases
Solution Approach 1:
The invention dynamically adjusts the selection of signal points based on distortion conditions. By choosing imaginary signal points that optimize the balance between amplitude information availability and distortion levels, the system adapts parameters to achieve best reception performance under varying channel conditions.
Data Source
Figure 1
Figure 2~3
Figure 4A~4C
AI summary
The present disclosure relates to a reception device, a reception method, and a program that are capable of compensating for distortion in a reception signal that does not include any known signal of the same constellation as that of the data section. A modulation unit generates a modulated signal by modulating data that is of a reception signal and has been subjected to error correction. An averaging unit that generates distortion information for each constellation of the modulated signal by averaging the reception signal that is of the same time as the modulated signal and has not been subjected to the error correction, the distortion information indicating distortion in a modulated signal of each constellation. The present disclosure can be applied to reception devices that receive signals compliant with the ARIB STD-B44 standards, the DVB-S2 or DVB-S2X standards, or the like.