Thèse soutenue

Analyse et réduction du facteur de crête dans le contexte de la radio intelligente
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Auteur / Autrice : Sajjad Hussain
Direction : Jacques Palicot
Type : Thèse de doctorat
Discipline(s) : Traitement du signal et télécommunications
Date : Soutenance en 2009
Etablissement(s) : Rennes 1
Ecole(s) doctorale(s) : École doctorale Mathématiques, télécommunications, informatique, signal, systèmes, électronique (Rennes)
Partenaire(s) de recherche : autre partenaire : Université européenne de Bretagne (2007-2016)

Résumé

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Multi-carrier signals like Orthogonal Frequency Division Multiplexing (OFDM) have high Peak to Average Power Ratio (PAPR). A signal with high PAPR when amplified by a Power Amplifier (PA) without any special treatment, results in distortions. There are methods devised to either linearize the amplifier or to reduce the PAPR to tackle this problem. In this thesis, the focus is on the solution of PA non-linear distortions problem through PAPR reduction. There are several methods proposed in literature for the PAPR reduction of multi-carrier OFDM signals. We have extended this study to multi-standard signal scenario. One of the outcomes of rapid growth in the field of telecommunications is Software Radio (SWR) concept which is a multi-standard system. Its evolved form is Cognitive Radio which is the basically SWR embedded with intelligence. We have analyzed and reduced PAPR of SWR and Cognitive Radio signals under different scenarios. The effects of different system parameters on PAPR reduction performance are studied. The compromise between PAPR reduction gain and computational complexity is given.