Semester of Graduation

Summer

Degree

Master of Electrical Engineering (MEE)

Department

Electrical and Computer Engineering

Document Type

Thesis

Abstract

The objective of this thesis is to utilize the power of machine learning to develop a neural network-aided receiver in a DVBS-2X satellite communication system to improve the downlink transmission quality in the presence of interference. An emphasis is placed on mitigating the effects caused by non-linear distortions, carrier frequency offset, and additive white Gaussian noise. This thesis proposes a feed-forward neural network with two hidden layers to compensate for the distortions in the received signal. The proposed system model uses 16-APSK modulation scheme. The neural network is tested under varying degrees of non-linear distortion, frequency offsets, and varying levels of noise power.

Digital pre-distortion and frequency offset correction are used to compare neural network performance. The experiments presented in this work are generated using Simulink, MATLAB, and TensorFlow. The results show that the neural network can outperform digital pre-distortion when only non-linear distortions are considered. The neural network can also compensate for carrier frequency offset when the offset is less severe. However, the proposed neural network struggles when severe frequency offsets are considered. Future work will investigate using neural network architectures with memory to better compensate for severe carrier frequency offset and other channel effects like fading.

Date

7-8-2022

Committee Chair

Shuangqing Wei

Available for download on Monday, July 07, 2025

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