Semester of Graduation

August 2021

Degree

Master of Electrical Engineering (MEE)

Document Type

Thesis

Abstract

Recent developments in the communications space have increased interest in the use of Satellite Communication (SatComm) links. With this increased usage, comes an increased potential for interference, with vulnerability resulting from the very open position of satellites and crowded bands. This thesis examines the effect of interference on a specific type of SatComm modulation, DVB-S2X. Using software simulation in the form of Matlab’s Simulink environment, Gaussian; Uniform; BPSK; QPSK; APSK; and CPM modulations were tested as varieties of interference. It was found that CPM modulation was generally the most damaging modulation of those examined. QPSK and BPSK are more damaging in certain scenarios, but CPM is able to cause damage more consistently and effectively in a broad range of conditions. This reliability makes CPM modulation a type of interference that should be considered in preventative measures against interference. Further investigation of CPM is suggested. Additional conditions were applied to the signal of interest and the system model itself. These include synchronization error, nonlinearity, applying a windowing function to the interferer instead of pulse shaping, and frequency separation between the signal of interest and interferer. Synchronization error has a significant effect when phase has a large impact on an interferer’s ability to cause interference. Pulse shaping is typically better than using a window function, although using a Chebyshev window can cause more damage in specific conditions. CPM is more damaging than other interferers while frequency separated from the signal of interest. Nonlinearity caused by LNA and HPA greatly impacts the performance of the signal of interest under the effect of an interferer by increasing the error rate.

Committee Chair

Shuangqing Wei

Available for download on Wednesday, July 12, 2028

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