Cover Image

Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method

Digital band-pass modulation methods split in two groups, single carrier and multi carrier. A particular type of multi-carrier modulation is Orthogonal Frequency Division Multiplexing (OFDM) which is used in broadband wireless communication such as Worldwide Interoperability for Microwave Access (Wi...

Full description

Saved in:
Bibliographic Details
Main Author: Razavi, Sara
Format: Thesis
Language:English
Published: 2014
Online Access:http://psasir.upm.edu.my/id/eprint/48106/1/FK%202014%2043R.pdf
http://psasir.upm.edu.my/id/eprint/48106/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.upm.eprints.48106
record_format eprints
spelling my.upm.eprints.481062017-02-07T03:34:21Z http://psasir.upm.edu.my/id/eprint/48106/ Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method Razavi, Sara Digital band-pass modulation methods split in two groups, single carrier and multi carrier. A particular type of multi-carrier modulation is Orthogonal Frequency Division Multiplexing (OFDM) which is used in broadband wireless communication such as Worldwide Interoperability for Microwave Access (WiMAX), Long Term Evolution (LTE), and 4th Generation mobile telecommunications (4G). The OFDM system has many advantages over the FDM which is used in single carrier systems. One of the most significant advantages is signal protection against fading effects that happen through the nature of multipath environment. However OFDM signals suffer from a main drawback, which is high Peak to Average Power Ratio (PAPR). Passing high PAPR signal through the Power Amplifier (PA) causes distortions which make the PA operate beyond the linear area and enter to the saturation region. To solve the high PAPR problem in OFDM signals, various techniques have been developed such as Classical Selected Mapping (C-SLM) and Dummy Sequence Insertion (DSI). In the DSI method, by inserting the dummy signals the probability of PAPR is improved while the spectrum efficiency and data rate degrade. In the C-SLM method, the PAPR performance is enhanced at the expense of an increase in the number of Inverse Fast Fourier Transform (IFFT) which leads to higher complexity. Another disadvantage of the C-SLM method is named Side Information (SI) which is additional transmitted bits that assists the receiver to recover the original signal. Transmitting the SI bits decreases the bandwidth efficiency; moreover, when the receiver detects SI bits incorrectly, the entire received structure will be lost. In order to resist this trouble, strong channel coding should be used that protects the SI, but system complication and data rate reduction will appear as a result. In this thesis, a modified SLM scheme without Side Information is proposed which has the ability of transmitting and recovering the data signal without SI bits at a lower amount of computational complexity at the receiver side. Moreover in this method, some dummy sequences are inserted in order to better PAPR reduction. Regards to the simulation results the proposed method outperforms with 69% reduction in computational complexity at receiver side rather than the previous method. Furthermore the PAPR performances results illustrate around 3.8dB reduction, at CCDF 0.01 % or CCDF=10-4. The outcome of error performances in this method, demonstrate better BER performances at 16-QAM modulation. 2014-07 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/48106/1/FK%202014%2043R.pdf Razavi, Sara (2014) Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method. Masters thesis, Universiti Putra Malaysia.
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Digital band-pass modulation methods split in two groups, single carrier and multi carrier. A particular type of multi-carrier modulation is Orthogonal Frequency Division Multiplexing (OFDM) which is used in broadband wireless communication such as Worldwide Interoperability for Microwave Access (WiMAX), Long Term Evolution (LTE), and 4th Generation mobile telecommunications (4G). The OFDM system has many advantages over the FDM which is used in single carrier systems. One of the most significant advantages is signal protection against fading effects that happen through the nature of multipath environment. However OFDM signals suffer from a main drawback, which is high Peak to Average Power Ratio (PAPR). Passing high PAPR signal through the Power Amplifier (PA) causes distortions which make the PA operate beyond the linear area and enter to the saturation region. To solve the high PAPR problem in OFDM signals, various techniques have been developed such as Classical Selected Mapping (C-SLM) and Dummy Sequence Insertion (DSI). In the DSI method, by inserting the dummy signals the probability of PAPR is improved while the spectrum efficiency and data rate degrade. In the C-SLM method, the PAPR performance is enhanced at the expense of an increase in the number of Inverse Fast Fourier Transform (IFFT) which leads to higher complexity. Another disadvantage of the C-SLM method is named Side Information (SI) which is additional transmitted bits that assists the receiver to recover the original signal. Transmitting the SI bits decreases the bandwidth efficiency; moreover, when the receiver detects SI bits incorrectly, the entire received structure will be lost. In order to resist this trouble, strong channel coding should be used that protects the SI, but system complication and data rate reduction will appear as a result. In this thesis, a modified SLM scheme without Side Information is proposed which has the ability of transmitting and recovering the data signal without SI bits at a lower amount of computational complexity at the receiver side. Moreover in this method, some dummy sequences are inserted in order to better PAPR reduction. Regards to the simulation results the proposed method outperforms with 69% reduction in computational complexity at receiver side rather than the previous method. Furthermore the PAPR performances results illustrate around 3.8dB reduction, at CCDF 0.01 % or CCDF=10-4. The outcome of error performances in this method, demonstrate better BER performances at 16-QAM modulation.
format Thesis
author Razavi, Sara
spellingShingle Razavi, Sara
Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
author_facet Razavi, Sara
author_sort Razavi, Sara
title Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
title_short Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
title_full Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
title_fullStr Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
title_full_unstemmed Improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
title_sort improvement of peak-to-average power ratio reduction in orthogonal frequency - division multiplexing systems using free side information selected mapping method
publishDate 2014
url http://psasir.upm.edu.my/id/eprint/48106/1/FK%202014%2043R.pdf
http://psasir.upm.edu.my/id/eprint/48106/
_version_ 1643834076098985984
score 13.211869

Similar Items