Wireless Communication System Frequency Hopping Interference Management
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Solution Overview
Problem
Existing wireless communication systems face challenges in minimizing radio wave interference between adjacent stations and interference from other wireless systems, leading to potential communication failures and instability in hopping pattern changes.
Innovation Solution
The system divides available channels into distinct channel groups and changes channel phases synchronously among ground stations to prevent interference, allowing individual stations to switch channels based on local interference conditions without considering other stations' channels, thereby reducing interference from both internal and external sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hopping pattern is changed to avoid radio wave interference, then communication failure is prevented, but adjacent stations may newly experience interference and the process may not converge
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands and assigns different hopping patterns to different sub-bands. When interference is detected in one sub-band, only the affected station changes its hopping pattern for that specific sub-band, rather than all stations changing their entire hopping patterns. This segmentation prevents the cascading effect that causes non-convergence while maintaining communication reliability.
Solution Approach 2:
The patent applies local quality by allowing each station to independently determine and change its hopping pattern based on its own local interference conditions. Each station monitors its own received signal quality and selectively changes hopping patterns only in sub-bands where interference is detected, rather than applying a uniform hopping pattern change across all stations and all frequency bands. This localized approach prevents unnecessary hopping pattern changes at adjacent stations that are not experiencing interference.
2Productivity
If hopping patterns are changed to avoid interference from other wireless systems, then operation rate is improved, but interference from adjacent stations increases
Solution Approach 1:
The patent merges the hopping pattern determination processes of multiple stations by establishing a master station that coordinates hopping pattern selection for slave stations. The master station determines hopping patterns considering the frequency bands used by slave stations, and slave stations align their hopping patterns with the master station's selections. This coordinated approach ensures that adjacent stations use compatible hopping patterns that avoid mutual interference while maintaining high operation rates.
Solution Approach 2:
The patent implements feedback mechanisms where stations monitor their communication quality and report interference conditions to the master station. The master station uses this feedback information to adjust and determine appropriate hopping patterns for all slave stations, ensuring that the selected patterns avoid both external interference and internal interference from adjacent stations in the wireless communication system.
Data Source
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AI summary
A wireless communication system includes: a plurality of master stations; slave stations that communicate with the master stations; and a central station that instructs frequencies used in the master stations; wherein each of the master stations has a plurality of frequencies changed at constant time intervals, each of the master stations selects a frequency to use out of the frequencies not overlapping with the frequency used in another master station in the same time zone, from among the plurality of frequencies, and when communication quality of the selected frequency to use is lower than a predetermined threshold value, each of the master stations switches the frequency to the other frequency from within the plurality of frequencies included in the own station.