Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing

Orthogonal Frequency Division Multiplexing (OFDM) offers an attractive multicarrier technique with high spectral efficiency, simple implementation and robustness against multipath fading. A trend of OFDM development is to increase the number of subcarriers to enhance efficiency. However, when the nu...

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Main Author:	Wahab, Aeizaal Azman Abdul
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TK1-9971 Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.usm.my/45835/1/Aeizaal%20Azman%20Abdul%20Wahab24.pdf
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id	my-usm-ep.45835
record_format	uketd_dc
spelling	my-usm-ep.458352019-12-12T01:41:26Z Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing 2014-02 Wahab, Aeizaal Azman Abdul TK1-9971 Electrical engineering. Electronics. Nuclear engineering Orthogonal Frequency Division Multiplexing (OFDM) offers an attractive multicarrier technique with high spectral efficiency, simple implementation and robustness against multipath fading. A trend of OFDM development is to increase the number of subcarriers to enhance efficiency. However, when the number of subcarriers increases, certain time domain OFDM coefficients are likely to acquire excessively large magnitudes. As such, the OFDM baseband waveform is susceptible to high PAPR value and may suffer from non linear distortion at subsequent power amplifier stage. This high PAPR can limit the transmitter power efficiency, cause spectral spreading and reduce the bit-error-rate (BER) performance. To alleviate these potential performance problems, two novel computationally efficient and low cost PAPR reduction methods are proposed. The first method, called DCT-OFDM Method, seeks to apply alternative structure for transmitting the high speed data in the OFDM system. The character of the DCT energy focused is made use of in the frequency domain and it helps to reduce the PAPR engendered by IFFT at the transmitter statistically, avoiding the nonlinear distortion in OFDM systems due to great change of PAPR. It is mathematically verified that this method is potent to reduce PAPR. Simulation results show that about 2.2 dB reduction in PAPR value is achieved by this technique. Statistical Redistribution Method (SRM) which makes use of a non linear companding operation is selected and applied on the OFDM outputs signals has been used as a combination with Selected Mapping Method (SLM). The proposed scheme utilizes Selected Mapping (SLM) followed by the companding SRM technique to further reduce the PAPR of the OFDM signal. Simulation results indicate that about 5 dB reduction in PAPR is achieved compared with the conventional SLM algorithm. 2014-02 Thesis http://eprints.usm.my/45835/ http://eprints.usm.my/45835/1/Aeizaal%20Azman%20Abdul%20Wahab24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Elektrik & Elektronik
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	TK1-9971 Electrical engineering Electronics Nuclear engineering
spellingShingle	TK1-9971 Electrical engineering Electronics Nuclear engineering Wahab, Aeizaal Azman Abdul Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
description	Orthogonal Frequency Division Multiplexing (OFDM) offers an attractive multicarrier technique with high spectral efficiency, simple implementation and robustness against multipath fading. A trend of OFDM development is to increase the number of subcarriers to enhance efficiency. However, when the number of subcarriers increases, certain time domain OFDM coefficients are likely to acquire excessively large magnitudes. As such, the OFDM baseband waveform is susceptible to high PAPR value and may suffer from non linear distortion at subsequent power amplifier stage. This high PAPR can limit the transmitter power efficiency, cause spectral spreading and reduce the bit-error-rate (BER) performance. To alleviate these potential performance problems, two novel computationally efficient and low cost PAPR reduction methods are proposed. The first method, called DCT-OFDM Method, seeks to apply alternative structure for transmitting the high speed data in the OFDM system. The character of the DCT energy focused is made use of in the frequency domain and it helps to reduce the PAPR engendered by IFFT at the transmitter statistically, avoiding the nonlinear distortion in OFDM systems due to great change of PAPR. It is mathematically verified that this method is potent to reduce PAPR. Simulation results show that about 2.2 dB reduction in PAPR value is achieved by this technique. Statistical Redistribution Method (SRM) which makes use of a non linear companding operation is selected and applied on the OFDM outputs signals has been used as a combination with Selected Mapping Method (SLM). The proposed scheme utilizes Selected Mapping (SLM) followed by the companding SRM technique to further reduce the PAPR of the OFDM signal. Simulation results indicate that about 5 dB reduction in PAPR is achieved compared with the conventional SLM algorithm.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Wahab, Aeizaal Azman Abdul
author_facet	Wahab, Aeizaal Azman Abdul
author_sort	Wahab, Aeizaal Azman Abdul
title	Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
title_short	Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
title_full	Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
title_fullStr	Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
title_full_unstemmed	Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing
title_sort	peak to average power ratio reduction in wireless orthogonal frequency division multiplexing
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Elektrik & Elektronik
publishDate	2014
url	http://eprints.usm.my/45835/1/Aeizaal%20Azman%20Abdul%20Wahab24.pdf
_version_	1747821577382133760

Peak To Average Power Ratio Reduction In Wireless Orthogonal Frequency Division Multiplexing

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