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Dissertation/Thesis Abstract

Comparison of Different Predistortion Techniques for Orthogonal Frequency Division Multiplexing Systems
by Kaur, Amandeep, M.S., California State University, Long Beach, 2019, 47; 13426595
Abstract (Summary)

Wireless channels have significant problems like multipath fading, delay spread, frequency selective fading. Guard bands/channel equalization techniques are employed to overcome these. However, these solutions are complex and don’t solve the issue of bandwidth scarcity. Thus, Orthogonal Frequency Division Multiplexing was introduced; a special case of Frequency Division Multiplexing where orthogonal subcarriers overlap in the frequency domain using lesser bandwidth without any inter-symbol interference.

The next challenge is to reduce the error rate in transmission. This thesis focuses on the noise created because of the non-linear input/output relationship of the power amplifier used. Different techniques used to linearize power amplifiers are compared. Predistortion was found to be most effective. Various predistortion schemes are compared and error rate performance evaluated for the Orthogonal Frequency Division Multiplexing system with and without Predistortion as well as for different modulation techniques. Dynamic Digital Predistortion paired with 8 Quadrature Amplitude Modulation was found to work most efficiently.

Indexing (document details)
Advisor: Chang, Chin
Commitee: Hamano, Fumio, Mozumdar, Mohammad
School: California State University, Long Beach
Department: Electrical Engineering
School Location: United States -- California
Source: MAI 58/05M(E), Masters Abstracts International
Subjects: Applied Mathematics, Electrical engineering, Technical Communication
Keywords: Bit error rate, Communication systems, Feed-forward, OFDM, Power amplifier linearization, Predistortion
Publication Number: 13426595
ISBN: 978-1-392-09728-1
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