Combined Satellite Terrestrial Communication Frequency Interference
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Solution Overview
Problem
Combined satellite and terrestrial communication systems face interference issues due to shared frequency spectrum, leading to inefficiencies and the need for wasteful bandwidth division or dynamic interference mitigation techniques.
Innovation Solution
The system employs interference isolation through distinct frequency allocation for uplink and downlink communications between satellite and terrestrial components, allowing the same frequencies to be used simultaneously without coordination, utilizing active beam-steering and interference cancellation to minimize self-interference, and optimizing frequency reuse within allocated bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If frequency spectrum is shared between satellite and terrestrial systems, then bandwidth utilization is improved, but interference between components increases
Solution Approach 1:
The system segments the frequency spectrum into distinct uplink and downlink bands. Satellite uplink frequencies are separated from terrestrial uplink frequencies, and satellite downlink frequencies are separated from terrestrial downlink frequencies. This segmentation allows both systems to operate simultaneously in the same spectrum without mutual interference, resolving the contradiction between bandwidth utilization and interference.
2Object-generated harmful factors
If frequency division is used to mitigate interference, then interference is reduced, but bandwidth efficiency deteriorates
Solution Approach 1:
The system moves from traditional frequency division (one-dimensional separation) to a two-dimensional frequency allocation scheme where uplink and downlink are independently managed. By establishing distinct frequency relationships for uplink and downlink directions, the system achieves interference mitigation while maintaining high bandwidth efficiency, as each direction can fully utilize its allocated spectrum without wasting frequencies.
3Object-generated harmful factors
If dynamic interference mitigation is implemented, then interference management is improved, but system complexity increases
Solution Approach 1:
The system implements preliminary frequency allocation where uplink and downlink frequencies are pre-assigned to satellite and terrestrial components according to the invention's specified frequency relationships. This preliminary arrangement eliminates the need for complex real-time dynamic interference mitigation, as interference is prevented by design rather than through ongoing complex control mechanisms, thereby reducing system complexity.
Data Source
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AI summary
A combined satellite and terrestrial communication system may include at least one satellite earth station, for communication via a satellite with a plurality of terminals using one or more satellite links; a plurality of terrestrial stations, for communication with the plurality of terminals using one or more terrestrial links; wherein the satellite links overlap or coincide in frequency with the terrestrial links; and each of the terminals includes means for inhibiting interference between the satellite links and the terrestrial links.