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Power amplifier memory polynomial predistorter for long term evolution application

In Radio Frequency (RF) Front-End wireless communications systems, the power amplifier should be efficient in order to support more users and leads to decrease the costs of energy, and to extend the duration of the battery life, accordingly. Modern digital modulated signals like: Long Term Evo...

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Main Author: Mazidi, Hossein
Format: Thesis
Language:English
Published: 2015
Online Access:http://psasir.upm.edu.my/id/eprint/68099/1/fk%202015%20125%20ir.pdf
http://psasir.upm.edu.my/id/eprint/68099/
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spelling my.upm.eprints.680992019-04-15T06:39:51Z http://psasir.upm.edu.my/id/eprint/68099/ Power amplifier memory polynomial predistorter for long term evolution application Mazidi, Hossein In Radio Frequency (RF) Front-End wireless communications systems, the power amplifier should be efficient in order to support more users and leads to decrease the costs of energy, and to extend the duration of the battery life, accordingly. Modern digital modulated signals like: Long Term Evolution (LTE) and Universal Mobile Telephone System (UMTS) exhibit difficult challenging concerns on the efficiency of the radio frequency power amplifiers and their design. Despite the spectral efficiency of these new modulated schemes, the RF PAs which are excited by the modulated signals like LTE, can experience nonlinear and unstable situation. These situations cause distortions and then result in lots of drawbacks like: power loss or heating. Therefore, some linearization techniques have been proposed to overcome the effects of non linearity. The designer can implement the digital predistortion and apply it to the input of the amplifiers for the top speed digital processors. This solution represents a significant paradigm shift for design and compensation of the nonlinear RF PAs. In this thesis, some behavioral modeling approaches of the nonlinear dynamic distortions in the wireless communication systems are investigated to model RF nonlinear PAs in order to compensate the memory effects as terms of their non linearity. A brief description of some characterization techniques will be explained. These nonlinear modeling techniques can be applied to the design of successful predistortion algorithms. The overall structure of a linearized transmitter using Memory Polynomial Digital Predistortion (MP DPD) architecture is represented to obtain both linearity and efficiency of the nonlinear PAs. The results are obtained by simulations through MATLAB. An open loop test bench is set up by using ZVE-8G+ power amplifier and Agilent equipment such as Agilent vector signal generator (VSG)EXG-D series and Agilent vector signal analyzer (VSA) PXI series in order to generate LTE down-link signal with 5 MHz bandwidth. Then, the test bench's output signal is given in arbitrary waveform format (I/Q) to the MATLAB software as the input.In conclusion, MP DPD is resulted in as improvement between 15 to 20 dB in the adjacent channel power ratio (ACPR). Therefore, the characteristics of the realized amplifiers are measured to satisfy the Error Vector Magnitude (EVM) and desired power spectral density (PSD) is plotted as requirements for Wideband Code Division Multiple Access (WiMAX) base stations and LTE down-link signal. Effect of some elements like: number of iterations, input power back-of (IBO) points, the memory effect modelling ration (MEMR) matric for different PAs with memory effects and memory-less respectively, on the performance of predistorter, are investigated. 2015-02 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/68099/1/fk%202015%20125%20ir.pdf Mazidi, Hossein (2015) Power amplifier memory polynomial predistorter for long term evolution application. 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 In Radio Frequency (RF) Front-End wireless communications systems, the power amplifier should be efficient in order to support more users and leads to decrease the costs of energy, and to extend the duration of the battery life, accordingly. Modern digital modulated signals like: Long Term Evolution (LTE) and Universal Mobile Telephone System (UMTS) exhibit difficult challenging concerns on the efficiency of the radio frequency power amplifiers and their design. Despite the spectral efficiency of these new modulated schemes, the RF PAs which are excited by the modulated signals like LTE, can experience nonlinear and unstable situation. These situations cause distortions and then result in lots of drawbacks like: power loss or heating. Therefore, some linearization techniques have been proposed to overcome the effects of non linearity. The designer can implement the digital predistortion and apply it to the input of the amplifiers for the top speed digital processors. This solution represents a significant paradigm shift for design and compensation of the nonlinear RF PAs. In this thesis, some behavioral modeling approaches of the nonlinear dynamic distortions in the wireless communication systems are investigated to model RF nonlinear PAs in order to compensate the memory effects as terms of their non linearity. A brief description of some characterization techniques will be explained. These nonlinear modeling techniques can be applied to the design of successful predistortion algorithms. The overall structure of a linearized transmitter using Memory Polynomial Digital Predistortion (MP DPD) architecture is represented to obtain both linearity and efficiency of the nonlinear PAs. The results are obtained by simulations through MATLAB. An open loop test bench is set up by using ZVE-8G+ power amplifier and Agilent equipment such as Agilent vector signal generator (VSG)EXG-D series and Agilent vector signal analyzer (VSA) PXI series in order to generate LTE down-link signal with 5 MHz bandwidth. Then, the test bench's output signal is given in arbitrary waveform format (I/Q) to the MATLAB software as the input.In conclusion, MP DPD is resulted in as improvement between 15 to 20 dB in the adjacent channel power ratio (ACPR). Therefore, the characteristics of the realized amplifiers are measured to satisfy the Error Vector Magnitude (EVM) and desired power spectral density (PSD) is plotted as requirements for Wideband Code Division Multiple Access (WiMAX) base stations and LTE down-link signal. Effect of some elements like: number of iterations, input power back-of (IBO) points, the memory effect modelling ration (MEMR) matric for different PAs with memory effects and memory-less respectively, on the performance of predistorter, are investigated.
format Thesis
author Mazidi, Hossein
spellingShingle Mazidi, Hossein
Power amplifier memory polynomial predistorter for long term evolution application
author_facet Mazidi, Hossein
author_sort Mazidi, Hossein
title Power amplifier memory polynomial predistorter for long term evolution application
title_short Power amplifier memory polynomial predistorter for long term evolution application
title_full Power amplifier memory polynomial predistorter for long term evolution application
title_fullStr Power amplifier memory polynomial predistorter for long term evolution application
title_full_unstemmed Power amplifier memory polynomial predistorter for long term evolution application
title_sort power amplifier memory polynomial predistorter for long term evolution application
publishDate 2015
url http://psasir.upm.edu.my/id/eprint/68099/1/fk%202015%20125%20ir.pdf
http://psasir.upm.edu.my/id/eprint/68099/
_version_ 1643839100506079232
score 13.211869

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