Visible Light Communication Reception Device Distortion Reduction
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Solution Overview
Problem
Existing reception devices in visible light communication systems face distortion issues due to high-frequency components at symbol boundaries, leading to decreased demodulation performance, especially in high-speed data transmission, and require significant computational power for distortion compensation.
Innovation Solution
A reception device that converts received signals into digital form, identifies and excludes regions with significant distortion, and performs demodulation using known signal parts to reduce distortion influence, thereby achieving high demodulation performance with minimal computational processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonlinear computation is performed to compensate for distortion in the received signal, then demodulation performance is improved, but the computational power required increases significantly
Solution Approach 1:
The patent extracts and removes the distorted portions of the signal (symbol boundaries with high-frequency components) before demodulation. By identifying and excluding these problematic regions from the demodulation process, the system achieves good demodulation performance without requiring complex nonlinear computation to compensate for distortion.
Solution Approach 2:
The received signal is segmented into useful portions (excluding symbol boundaries) and discarded portions (including distorted symbol boundaries). The demodulation is performed only on the useful portions, avoiding the need to process distorted regions and eliminating the need for complex distortion compensation calculations.
2Productivity
If high-speed communication is implemented to transmit large amounts of data, then data transmission rate is improved, but distortion in the received signal increases
Solution Approach 1:
The patent removes the distorted portions of the signal (symbol boundaries) before demodulation. By extracting and excluding these problematic regions, the system maintains high demodulation performance even in high-speed communication where distortion is more severe.
Solution Approach 2:
Instead of processing the entire received signal including distorted portions, the patent applies partial action by demodulating only the useful portions of the signal. This selective processing maintains reception quality without requiring excessive computational resources.
Data Source
AI summary
Provided are a reception device, a reception method and a transmission reception system capable of reducing the influence of distortion in a received signal and achieving high demodulation performance without performing a computation process having a great amount of calculations. The reception device receives a signal containing a known signal part and a data part, and includes a conversion unit that converts the signal received by a reception unit into a digital signal, a region determination unit that determines a nonuse region which is a periodic region containing distortion in the digital signal, on a basis of a first digital signal in the known signal part contained in the digital signal and a known signal held in advance, and a demodulation unit that performs demodulation on the digital signal by using a second digital signal in a region other than the nonuse region in the digital signal.