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Interference Mitigation Using Cyclic Autocorrelation and Multi-Objective OptimizationRadio frequency interference on space-to-ground communications links can degrade performance and disrupt the transfer of critical data. These interference events become increasingly likely as more users enter the spectrum, due in part to shared spectrum allocations and scheduling conflicts. If this interference could be detected and mitigated by an automated system, then link performance and reliability in these scenarios could be improved. This report describes the implementation and evaluation of an automated interference mitigation system that provides this functionality. The system uses Cyclic Autocorrelation (CAC) signal processing techniques to monitor the spectrum and detect interfering signals, and it applies a multi-objective optimization approach to mitigate interference by changing link parameters to continuously optimize the link. The implementation was evaluated to characterize its signal detection capabilities for various link qualities and to compare its link management performance to Adaptive Coding and Modulation (ACM) and Constant Coding and Modulation (CCM) when in the presence of randomized interference. In the latter evaluation, the interference mitigation system achieved the highest average throughput in each tested scenario. With these results, the proposed solution provides the groundwork for further automated link management capabilities and continued investigation into interference mitigation approaches.
Document ID
20190027051
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Koch, Mick V. (NASA Glenn Research Center Cleveland, OH, United States)
Downey, Joseph A. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
July 8, 2019
Publication Date
July 1, 2019
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
GRC-E-DAA-TN67798
NASA/TM—2019-220226
E-19710
Funding Number(s)
WBS: 553323.04.10.09.01.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Technical Review
Single Expert
Keywords
Interference mitigation
Signal processing

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