Tropospheric Evaporation Duct MIMO Wireless Link
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Solution Overview
Problem
Current trans-horizon wireless communication systems over sea or ocean face high costs, data rate limitations, and reliability issues, especially when using satellite or line-of-sight microwave methods, and previous tropospheric evaporation duct-based systems have not established reliable high-data-rate links.
Innovation Solution
A system utilizing (n×n) MIMO based transceiver microwave radio circuitry with vertically and/or horizontally arranged antennas and adaptive modulation and demodulation circuits, placed within twenty-five meters above sea level, to establish a reliable communication link with high availability and capacity beyond line-of-sight distances by adapting to varying pathloss conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite communication is used for trans-horizon wireless communication over the sea, then communication availability is improved, but cost and infrastructure complexity increase significantly
Solution Approach 1:
The patent uses the tropospheric evaporation duct as an intermediary medium to guide and confine microwave signals between the transmitter and receiver antennas. This natural atmospheric phenomenon acts as a waveguide, enabling trans-horizon communication without requiring satellite infrastructure or intermediate relay stations, thus resolving the contradiction between availability and infrastructure complexity
Solution Approach 2:
The patent replaces the mechanical/satellite-based communication system with an atmospheric physics-based solution. By utilizing the evaporation duct's natural refraction and total internal reflection properties, the system achieves trans-horizon communication through atmospheric waveguiding rather than satellite relay, reducing infrastructure requirements while maintaining communication availability
2Device complexity
If line-of-sight microwave communication is used over the ocean, then infrastructure requirements are reduced, but trans-horizon communication capability is lost
Solution Approach 1:
The patent transitions from direct line-of-sight propagation in three-dimensional space to waveguide confinement within the evaporation duct layer. By utilizing the vertical dimension of the atmospheric duct structure, the system guides signals along the Earth's curvature, effectively extending communication distance beyond the optical horizon while maintaining a relatively simple coastal infrastructure
Solution Approach 2:
The patent changes the propagation parameters by operating within the evaporation duct's specific refractive index gradient. By selecting frequencies that exploit the duct's waveguiding properties and positioning antennas within twenty-five meters above sea level to align with the duct structure, the system achieves trans-horizon distances without requiring elevated towers or satellite infrastructure
3Device complexity
If previous evaporation duct-based systems are used, then infrastructure needs are reduced, but reliable high-data-rate communication link establishment fails
Solution Approach 1:
The patent implements adaptive modulation and demodulation circuits that dynamically adjust communication parameters based on real-time channel conditions within the evaporation duct. This dynamic adaptation allows the system to maintain reliable high-data-rate communication despite variations in duct characteristics, solving the reliability problem of previous static systems while keeping infrastructure simple
Solution Approach 2:
The patent employs (n×n) MIMO circuitry that provides multiple functions including spatial diversity, multiplexing, and adaptive beamforming within a single coastal infrastructure setup. This multi-functional approach enables reliable high-data-rate communication through the evaporation duct without requiring multiple separate systems or complex infrastructure, addressing both reliability and infrastructure simplicity requirements
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 system achieves high availability and data rate throughput of up to 61 Mbps over distances up to fifty kilometers or more, significantly reducing infrastructure needs and matching the reliability and capacity of existing LOS technologies.
Implementation Method 1
trans-horizon tropospheric wireless communication system which utilizes an evaporation duct boundary in the troposphere to confine and guide microwave transmission signals from a transmitter antenna to a receiver antenna
Implementation Method 2
confine and guide microwave transmission signals... beyond a line-of-sight distance
Data Source
AI summary
A system for trans-horizon tropospheric-based wireless communication is provided. The system provides high availability and capacity as compared to a line-of-sight (LOS) standard microwave radio link while using very low height antenna towers. The system includes n×n MIMO transceiver circuitry and two or more antennas and adaptive modulation and demodulation in response to slow varying pathloss. Each of the two or more antennas is located at a vertical height above an average sea mean level within the evaporation duct. Availability percentage for different pathloss ranges along with adaptive modulation contributes to the overall availability according to the varying evaporation duct height.