Fiber Optic Bus RoF for IoT Coverage and Cost
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Solution Overview
Problem
Existing RFID systems face limitations in coverage area, transmission distance, and anti-interference capabilities, making them unsuitable for real-time, online management and integration in various applications, particularly in indoor environments and large-scale deployments.
Innovation Solution
A distributed IoT terminal system based on a fiber optic bus Radio Over Fiber (RoF) technology, which includes a core application part, preposed channel part, transmission channel part, acquisition field part, and acquisition terminal part, utilizing RF signal processing, phased array antennas, and optical sensors to enhance signal transmission and integration with IoT applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If more readers are deployed to expand coverage area, then the coverage area is improved, but the system deployment cost increases
Solution Approach 1:
The patent combines multiple readers into a single distributed antenna system where multiple antenna elements are integrated and controlled by one reader. This merging approach allows the system to cover a larger area without proportionally increasing the number of readers, thereby reducing deployment cost while expanding coverage area.
Solution Approach 2:
The patent introduces a distributed antenna structure that extends the traditional single-point reader model into a spatial distribution framework. By arranging multiple antenna elements in specific spatial configurations, the system achieves expanded coverage area without linearly increasing reader数量, effectively solving the contradiction between coverage and cost.
2Length of stationary object
If copper wire transmission is used for RFID signals, then the transmission distance is limited to short range, but increasing transmission distance requires more readers and higher cost
Solution Approach 1:
The patent replaces copper wire transmission with optical fiber transmission for the backbone network. Optical fibers have significantly lower signal attenuation and can transmit data over much longer distances without requiring signal repeaters or additional readers. This substitution enables long-distance transmission while avoiding the cost increase associated with deploying more copper-based readers.
3Length of stationary object
If RFID signals are transmitted over long distances, then the transmission range is improved, but the anti-interference ability deteriorates
Solution Approach 1:
The patent introduces optical fibers as an intermediary medium to separate the RFID communication function from the transmission medium. The optical fiber serves as a protected channel that isolates RF signals from electromagnetic interference in the environment. This intermediary approach enables long-distance transmission while maintaining anti-interference capability by preventing external electromagnetic noise from affecting the signal.
Solution Approach 2:
By substituting copper-based RF transmission with optical fiber transmission, the system eliminates the vulnerability to electromagnetic interference that plagues long-distance copper transmissions. The optical domain is immune to electromagnetic interference, thereby maintaining signal integrity over long distances without sacrificing anti-interference ability.
4Measurement precision
If indoor positioning technology is used for short range identification, then the positioning accuracy and response time are improved, but the long-distance communication capability and anti-interference ability are lost
Solution Approach 1:
The patent segments the positioning system into two functional parts: a distributed antenna system for long-distance communication and signal transmission, and a positioning processing unit for calculating positioning information. This segmentation allows the system to achieve both long-distance capability and high positioning accuracy by separating the communication function from the processing function, enabling indoor positioning to work effectively over extended ranges.
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 solution expands the coverage area, improves transmission distance, and enhances anti-interference capabilities, enabling real-time, online management and integration of IoT applications across various industries, including indoor positioning and real-time tracking of personnel, equipment, and products.
Implementation Method 1
Optical fiber communication has large capacity, low transmission loss, large relay distance. The relay distance is up to 200 kilometers, is 20 to 50 times that of copper wire.
Implementation Method 2
ROF is wireless access technology that combining optical fiber communication and wireless communication. It may realize rapid transmission, exchanging, controlling, signal regeneration and other functions of the ROF technology by operating fiber as a communication base station, and establishing transmission parameters and lines with a central station, and the RF signal is transmitted by using the optical carrier.
Data Source
AI summary
The invention discloses a distributed IoT terminal system and method based on a fiber optic bus RoF. The system comprises a core application part, a pre-channel part, a transmission channel part, an acquisition field part, an acquisition terminal part and a data source. The invention adopts the principle of light-borne ROF to adapt to pan-socialization, decentralization, verticalization, refinement, full traceability, full lifecycle management and governance, instant, real-time, online, interactive and distributed IoT applications. The integrated and integrated application of the invention improves social efficiency and saves social cost. It may be integrated and integrated the application into any application systems, and realized dynamic instant, real-time, online, centimeter level positioning application. It can infer the specific location of the positioning device. The invention combined ROF and RFID and combined high-speed bus and RFID technology to solve the “last mile problem” of RFID and physical offline applications.