Antenna Discrimination Angle Mitigates Interference in Mobile Earth Stations
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Solution Overview
Problem
Satellite communication systems experience performance deterioration due to radio frequency interference with terrestrial communication systems using the same frequency band, leading to inefficient frequency resource use and reduced service range, necessitating a method to mitigate interference effects from mobile earth stations to terrestrial radio stations.
Innovation Solution
An interference mitigation apparatus adjusts the transmission power of a mobile earth station based on its antenna discrimination angle with respect to the horizontal direction, determining the appropriate transmission power and scheme (BPSK, QPSK, 8PSK, or 16QAM) based on the angle to minimize interference with terrestrial radio stations, regardless of their position information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency channels are divided for satellite and terrestrial communication systems to avoid interference, then interference effects are reduced, but frequency resource efficiency is degraded
Solution Approach 1:
The patent applies local quality by adjusting transmission parameters (power, modulation scheme) based on the antenna discrimination angle, which varies with the mobile earth station's position. This allows selective mitigation of interference only when the antenna beam points toward terrestrial stations, while maintaining efficient frequency usage elsewhere. The interference mitigation is localized to specific angular ranges rather than applying blanket frequency separation.
2Object-affected harmful factors
If the distance between transmitting interferer and victim receiver is increased to reduce interference, then interference effects are reduced, but service range decreases
Solution Approach 1:
The patent employs dynamics by continuously adjusting transmission power and modulation schemes based on the real-time antenna discrimination angle. As the mobile earth station moves and the angle changes, the system dynamically adapts parameters to mitigate interference only when necessary (when the beam points toward terrestrial stations), rather than maintaining fixed large separation distances. This dynamic adaptation preserves service range while reducing interference effects.
3Reliability
If transmission power of mobile earth station is increased to improve communication quality, then communication performance is improved, but interference effects to terrestrial radio stations increase
Solution Approach 1:
The patent applies parameter changes by adjusting transmission power and modulation scheme based on the antenna discrimination angle. When the angle indicates the beam is directed away from terrestrial stations, higher transmission power and more robust modulation schemes can be used to improve communication quality. When the angle indicates potential interference toward terrestrial stations, the system reduces power and uses more resilient modulation, thus balancing communication quality with interference mitigation.
Data Source
AI summary
An interference effect mitigating method may be a method of mitigating interference effects of a mobile earth station to a terrestrial radio station. The interference effect mitigating method may include collecting position information including a position, of a communication device of a first wireless communication network, which changes over time, determining an antenna discrimination angle based on the collected position information, and determining a transmission power and a transmission scheme of the communication device of the first wireless communication network based on the determined antenna discrimination angle, to mitigate interference effects of the communication device of the first wireless communication network to a communication device of a second wireless communication network.