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Comparison of different predistortion techniques for Orthogonal Frequency Division Multiplexing Systems

Author: Amandeep Kaur
Publisher: [Long Beach, California] : California State University, Long Beach, 2019.
Dissertation: M.S. California State University, Long Beach 2019
Series: California State University, Long Beach.; Master's thesis collection, Department of Electrical Engineering.
Edition/Format:   Thesis/dissertation : Thesis/dissertation : eBook   Computer File : English
Summary:
Abstract: 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
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Material Type: Thesis/dissertation, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Amandeep Kaur
ISBN: 9781392097281 1392097282
OCLC Number: 1104796020
Description: 1 online resource (ix, 38 pages) : illustrations (some color).
Series Title: California State University, Long Beach.; Master's thesis collection, Department of Electrical Engineering.
Responsibility: by Amandeep Kaur.

Abstract:

Abstract: 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.

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