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Peak and Power Reduction in Multicarrier Communication Systems

Andgart, Niklas LU (2005)
Abstract
Broadband multicarrier communication suffers from a large signal span, causing problems in both wireless and wireline systems. This is commonly referred to as a high peak to average ratio (PAR), and leads to a high power consumption, which is an important limitation in many communication systems.



This thesis puts focus on PAR reduction for wireline communication systems, in particular for the multicarrier-based DSL family. Special interest is put on the tone reservation method, where some subcarriers are used to construct a peak-canceling signal in counterphase to the signal peaks. A part of the thesis investigates properties of this method, in particular the proper placement of these subcarriers.



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Broadband multicarrier communication suffers from a large signal span, causing problems in both wireless and wireline systems. This is commonly referred to as a high peak to average ratio (PAR), and leads to a high power consumption, which is an important limitation in many communication systems.



This thesis puts focus on PAR reduction for wireline communication systems, in particular for the multicarrier-based DSL family. Special interest is put on the tone reservation method, where some subcarriers are used to construct a peak-canceling signal in counterphase to the signal peaks. A part of the thesis investigates properties of this method, in particular the proper placement of these subcarriers.



Applying PAR reduction in existing DSL systems raises the issue of standard compliance. This puts a number of requirements on the PAR algorithms. The thesis examines what can realistically be achieved in existing systems, with special attention given to the impact of a limited PSD mask. We derive bounds on achievable performance, address the optimization criterion, analyze implementational trade-offs, and describe guidelines for system design. For the system engineer, early indications of realistic performance can then be deduced for different designs, without need for extensive simulations for each parameter choice.



Implementation of the reduction algorithms, with the PSD mask taken into account, may efficiently be done with a proposed active-set based algorithm. The complexity is demonstrated to be well below 100 MIPS. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Professor Holte, Nils, NTNU, Trondheim, Norge
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Telekommunikationsteknik, line driver, Signal processing, Signalbehandling, Telecommunication engineering, power reduction, DSL, DMT, tone reservation, PAR, Peak to average ratio
pages
219 pages
publisher
Department of Information Technology, Lund Univeristy
defense location
Room E:1406, E-building, Ole Römers väg 3, Lund Institute of Technology
defense date
2005-11-25 10:15
external identifiers
  • other:ISRN:LUTEDX/TEIT-05/1032-SE
ISBN
91-7167-035-1
language
English
LU publication?
yes
id
fcd29097-44f6-450e-8fc9-981cffc60574 (old id 545618)
date added to LUP
2007-09-06 11:08:02
date last changed
2016-09-19 08:45:06
@phdthesis{fcd29097-44f6-450e-8fc9-981cffc60574,
  abstract     = {Broadband multicarrier communication suffers from a large signal span, causing problems in both wireless and wireline systems. This is commonly referred to as a high peak to average ratio (PAR), and leads to a high power consumption, which is an important limitation in many communication systems.<br/><br>
<br/><br>
This thesis puts focus on PAR reduction for wireline communication systems, in particular for the multicarrier-based DSL family. Special interest is put on the tone reservation method, where some subcarriers are used to construct a peak-canceling signal in counterphase to the signal peaks. A part of the thesis investigates properties of this method, in particular the proper placement of these subcarriers.<br/><br>
<br/><br>
Applying PAR reduction in existing DSL systems raises the issue of standard compliance. This puts a number of requirements on the PAR algorithms. The thesis examines what can realistically be achieved in existing systems, with special attention given to the impact of a limited PSD mask. We derive bounds on achievable performance, address the optimization criterion, analyze implementational trade-offs, and describe guidelines for system design. For the system engineer, early indications of realistic performance can then be deduced for different designs, without need for extensive simulations for each parameter choice.<br/><br>
<br/><br>
Implementation of the reduction algorithms, with the PSD mask taken into account, may efficiently be done with a proposed active-set based algorithm. The complexity is demonstrated to be well below 100 MIPS.},
  author       = {Andgart, Niklas},
  isbn         = {91-7167-035-1},
  keyword      = {Telekommunikationsteknik,line driver,Signal processing,Signalbehandling,Telecommunication engineering,power reduction,DSL,DMT,tone reservation,PAR,Peak to average ratio},
  language     = {eng},
  pages        = {219},
  publisher    = {Department of Information Technology, Lund Univeristy},
  school       = {Lund University},
  title        = {Peak and Power Reduction in Multicarrier Communication Systems},
  year         = {2005},
}