Dual Optical Filter Wireless Signal Interference Reduction
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Solution Overview
Problem
Optical wireless communication systems face challenges in maintaining decoding performance due to external interference, particularly from strong sunlight, which significantly reduces receiver decoding efficiency.
Innovation Solution
A method and apparatus for wireless optical communication that involves reducing interference using a photodiode array with a first and second optical filter, where the optical signal is incident on the first filter and then the second filter, and the interference is minimized based on the length and focal lengths of these filters, as well as the distance between them and the photodiode array, to convert the signal into an electrical signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single optical filter is used to reduce interference, then the device complexity is low, but the interference signal reduction is insufficient
Solution Approach 1:
The optical filtering function is segmented into two separate optical filters arranged in sequence. The first optical filter performs initial interference reduction, and the second optical filter provides additional filtering. This segmentation allows each filter to be simpler in design while achieving cumulative interference reduction效果, resolving the contradiction between interference reduction performance and device complexity.
2Reliability
If the optical signal is directly converted to electrical signal without filtering, then the signal processing is simple, but the decoding performance is poor due to interference
Solution Approach 1:
Two optical filters are introduced as intermediary components between the optical signal reception and electrical signal conversion. These filters act as mediators that selectively attenuate interference signals while allowing the desired optical signal to pass through, thereby improving decoding performance without requiring complex digital signal processing.
3Object-affected harmful factors
If multiple optical filters are used to reduce interference, then the interference signal reduction is improved, but the loss of desired signal increases
Solution Approach 1:
The optical filters are designed with specific parameters (filtering strength, transmission characteristics) that are optimized to achieve the right balance. By carefully selecting and adjusting these parameters, the system achieves effective interference reduction while minimizing the loss of the desired signal, resolving the contradiction between interference rejection and signal preservation.
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
This approach effectively minimizes optical interference, enhancing the signal transmission and reception robustness against external interference, thereby improving decoding performance and signal quality.
Implementation Method 1
converting the optical signal in which the interference signal is reduced into an electrical signal through a photodiode array
Implementation Method 2
The interference signal is reduced through a first optical filter on which the optical signal is incident and a second optical filter on which the optical signal passing through the first optical filter is incident
Data Source
AI summary
According to one embodiment of the present invention, an apparatus and method for transmitting and receiving signals in a wireless communication system comprise receiving an optical signal including an interference signal and a target signal, attenuating the interference signal, and converting the optical signal in which the interference signal is attenuated, into electric signals via a photodiode array, wherein a transceiver comprises a first optical filter upon which the optical signal is incident, and a second optical filter upon which the optical signal having passed through the first optical filter is incident, wherein the interference signal may be attenuated through the first optical filter and the second optical filter.