Peak to Average Power Ratio Reduction  in OFDM Systems

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Kahookar Toosi, Hossein | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39078 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Marvasti, Farrokh
Abstract:
High peak to average power ratio (PAPR) is one major drawback of OFDM system which highly affects the performance if untreated. Several methods have been proposed to overcome this problem. In all these methods reduction in PAPR is gained through a tradeoff with another system figure such as mean transmit power, bandwidth or BER. In this thesis we investigate high PAPR problem in OFDM, and we will introduce some methods proposed to alleviate it. These methods are divided into two classes; methods in the first class are based on finding a peak cancelling signal and methods in second class rely on solving a discrete optimization problem. We give a general formulaion for the methods in second group, and we propose a new method to solve it. Perfomance and computational complexity of this method is comared with perivious methods through computer aided simulations
Keywords:
Code Devision Multiple Access (CDMA) ; High Power Amplifier (HPA) ; Peak to Average Power Ratio ; Cumulative Probability Density

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