Optical Communication Multipath Reflection Removal
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Solution Overview
Problem
Existing optical communication systems using LED or similar technologies face challenges in reducing the effect of multipath reflections, which can lead to erroneous communications, especially between vehicles or between vehicles and road surfaces.
Innovation Solution
An optical communication apparatus equipped with a reception unit, a multipath removal unit, and a control unit that identifies and removes light signals due to reflection waves based on luminance, image size, and propagation distance, allowing for the extraction of accurate information from the received light signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical communication is used between vehicles or between road and vehicle, then communication speed and data transmission capability are improved, but multipath reflection occurs causing erroneous communications
Solution Approach 1:
The system performs preliminary identification of direct light signals versus reflected light signals using multiple parameters (luminance, image size, propagation distance) before information extraction. By preemptively filtering out reflected signals through the multipath removal unit, the system prevents erroneous communication data from being processed, thus maintaining both high communication speed and reliability
Solution Approach 2:
The multipath removal unit acts as an intermediary between the reception unit and the information extraction process. It receives raw light signal data, identifies and removes reflected signal components based on luminance, image size, and propagation distance analysis, then passes only purified direct signal information to the control unit for further processing
2Reliability
If reflection wave removal techniques are applied, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The system segments the light signal analysis into distinct hierarchical levels: first identifying light source groups based on overall luminance and position characteristics, then analyzing individual light source elements within each group. This segmentation allows the multipath removal unit to process complex reflected signal patterns systematically by handling groups and elements separately, reducing computational complexity while maintaining reliability
Solution Approach 2:
The system utilizes multiple physical parameters (luminance, image size, propagation distance) to differentiate between direct and reflected light signals. By changing the analysis from a single-parameter approach to a multi-parameter approach, the system can reliably identify and remove reflected signals without requiring overly complex hardware modifications, achieving reliability improvement through intelligent signal processing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces the impact of multipath reflections, enabling accurate detection and recognition of light source groups and elements, even in complex scenarios like vehicle-to-vehicle or vehicle-to-road interactions, thereby improving communication reliability.
Implementation Method 1
communication systems using light or radio waves have been proposed
Implementation Method 2
there may be a case in which reflection of a transmitted signal occurs by a road surface, another vehicle, and the like
Data Source
AI summary
An optical communication apparatus includes: a reception unit that receives, from a transmission apparatus which transmits a light signal including predetermined information, the transmitted light signal; a multipath removal unit that recognizes, when detecting a plurality of images having the same optical information in the received light signal, the light signal due to a reflection wave based on at least one of a luminance of the light signal, a size of an image corresponding to the light signal when receiving at the reception unit, and a propagation distance of the light signal and removes the light signal due to the reflection wave; and an control unit that acquires, from the light signal received by the reception unit, information based on the light signal obtained by removing the light signal due to the reflection wave by the multipath removal unit.