Fiber-Linked ODU-IDU Interface for Interference-Resistant Wireless Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in deployment flexibility, interference resistance, and fault tolerance due to the use of bulky coaxial cables, which are prone to signal degradation and physical damage, limiting the separation distance and coverage area of outdoor and indoor units.
Innovation Solution
A wireless communication system employing a fiber optic link between outdoor and indoor units, allowing for flexible deployment configurations, resistance to interference, and fault tolerance, with digital signal processing isolating analog signal processing within the outdoor unit and using multiplexing and switching technologies to share bandwidth efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coaxial cables are used to couple outdoor units and indoor units, then the system can be deployed with relatively simple infrastructure, but the cables are bulky, prone to interference and physical damage, and limit the separation distance between units
Solution Approach 1:
The patent replaces the mechanical/electrical coaxial cable system with an optical fiber communication system. The outdoor unit converts RF signals to optical signals for transmission through fiber optic cables to the indoor unit, eliminating the physical and electromagnetic limitations of coaxial cables while enabling longer separation distances and improved reliability
Solution Approach 2:
The patent introduces optical signals as an intermediary medium between the outdoor unit and indoor unit. By converting electrical RF signals to optical signals for transmission and then converting them back, the system achieves immunity to electromagnetic interference and physical damage that affects traditional coaxial cable systems
2Ease of operation
If coaxial cables are used to connect outdoor and indoor units, then deployment can proceed with conventional infrastructure, but the cables are resistant to turning tight radiuses and require large minimum radiuses
Solution Approach 1:
The patent replaces the rigid, bulky coaxial cable mechanical system with flexible optical fiber cables. The optical fiber medium allows for tight bending radiuses and easy routing through building structures, dramatically improving deployment flexibility and installation ease
3Reliability
If outdoor units are made relatively large to provide adequate signal processing, then communication quality can be maintained, but the units require appreciable space and structure for deployment
Solution Approach 1:
The patent segments the signal processing functions between the outdoor unit and indoor unit. The outdoor unit is reduced to essential RF-to-optical conversion and transmission functions, while more complex signal processing is performed at the indoor unit, allowing the outdoor unit to be compact and suitable for rooftop or mast deployment
Solution Approach 2:
The patent uses optical signal transmission to reduce the size of outdoor units. By converting RF signals to optical signals for transmission, the outdoor unit requires less complex analog signal processing hardware, enabling a more compact design that fits standard mounting configurations
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
The fiber optic link provides reliable and flexible communication infrastructure with reduced bulk and interference susceptibility, enabling longer distances and more efficient data transmission, suitable for large service areas and fault-tolerant configurations.
Implementation Method 1
a fiber optic link between an outdoor unit (ODU) subsystem and an indoor unit (IDU) subsystem
Data Source
AI summary
Systems and methods are disclosed which provide wireless communication systems implementing subsystems adapted for flexible deployment configurations and to resist the introduction of interference. Preferred embodiments of the present invention provide a wireless communication system configuration in which an ODU subsystem is coupled to an IDU subsystem using a fiber optic link. According to a preferred embodiment of the present invention, an ODU subsystem is adapted to provide conversion between digital and analog to thereby facilitate the use of a digital link between the ODU subsystem and a corresponding IDU subsystem. Embodiments of the present invention utilize a plurality of ODU subsystems configured according to the present invention to provide wireless communication coverage of a service area, such as to provide a wireless application termination system (WATS) hub for use in providing wireless communication links with respect to a plurality of subscriber units.