{"id":37476,"date":"2019-07-18T10:54:49","date_gmt":"2019-07-18T08:54:49","guid":{"rendered":"https:\/\/www.iemn.fr\/?p=37476"},"modified":"2019-07-18T11:09:29","modified_gmt":"2019-07-18T09:09:29","slug":"reseaux-de-capteurs-sous-interference-non-gaussienne-aspects-experimentaux-et-theoriques","status":"publish","type":"post","link":"https:\/\/www.iemn.fr\/en\/these\/reseaux-de-capteurs-sous-interference-non-gaussienne-aspects-experimentaux-et-theoriques.html","title":{"rendered":"R\u00e9seaux de capteurs sous interf\u00e9rence non-gaussienne : aspects experimentaux et th\u00e9oriques"},"content":{"rendered":"<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_one_full-25347b0a799d5b9f7058434b2a9c3182\">\n.flex_column.av-av_one_full-25347b0a799d5b9f7058434b2a9c3182{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-av_one_full-25347b0a799d5b9f7058434b2a9c3182 av_one_full  avia-builder-el-0  avia-builder-el-no-sibling  first flex_column_div av-zero-column-padding'     ><section  class='av_textblock_section av-jy8fukag-d053410e429035e7abfee654e4934a2a'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><blockquote>\n<h4><strong><a href=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-14684 alignleft\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-80x80.png\" alt=\"\" width=\"80\" height=\"80\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-80x80.png 80w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-36x36.png 36w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/03\/ico_these2.fw_-180x180.png 180w\" sizes=\"auto, (max-width: 80px) 100vw, 80px\" \/><\/a>Nicolas DE ARAUJO MOREIRA<br \/>\n<\/strong><\/h4>\n<p>Thesis defence<br \/>\n11\/07\/2019<br \/>\nIEMN Amphitheatre<\/p>\n<\/blockquote>\n<h4><strong><br \/>\nSummary:<\/strong><\/h4>\n<p>L\u2019Internet des Objets repr\u00e9sente un d\u00e9fi technique pour la communication 5G \u00e0 cause de sa h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9 caract\u00e9ristique: la bande 2.4 GHz ISM, par exemple, est partag\u00e9e entre diff\u00e9rentes types de technologies, comme Wifi, Bluetooth et Zigbee. En plus de la perte de qualit\u00e9 de communication, des \u00e9tudes r\u00e9cents montrent que l\u2019interf\u00e9rence augmente de fa\u00e7on significative la consommation d\u2019\u00e9nergie. Donc, traiter l\u2019interf\u00e9rence devient un t\u00e2che important pour assurer la r\u00e9ussite de la transmission de donn\u00e9s. Cette th\u00e8se s\u2019approche de deux aspects diff\u00e9rents des r\u00e9seaux h\u00e9t\u00e9rog\u00e8nes. La premi\u00e8re partie pr\u00e9sente un \u00e9tude exp\u00e9rimentale sur la nature de l\u2019interf\u00e9rence entre dispositifs IEEE 802.11 et 802.15.4, ses impacts dans la fiabilit\u00e9 de la communication et propose une description statistique. La conclusion principale est que, dans ce contexte, l\u2019interf\u00e9rence pr\u00e9sente un comportement non-Gaussien, plus pr\u00e9cis\u00e9ment, impulsif. Des travaux th\u00e9oriques r\u00e9cents alli\u00e9s avec ces r\u00e9sultats exp\u00e9rimentaux montrent que la distribution alpha-stable est plus convenable pour repr\u00e9senter bruits impulsives. Cela signifie que, une fois optimal, les architectures de communication classiques bas\u00e9 sur assomption Gaussienne, particuli\u00e8rement le m\u00e9thode des moindres carr\u00e9s et le r\u00e9cepteur lin\u00e9aire, ne sont plus optimales et pr\u00e9sentent une perte de performance significative. La deuxi\u00e8me partie pr\u00e9sente une architecture MIMO bas\u00e9 sur codage Alamouti, estimation de canal supervis\u00e9e bas\u00e9 sur m\u00e9thode Least Absolute Deviation et r\u00e9cepteur p-norme avec une estimation de p. L\u2019architecture propos\u00e9 pr\u00e9sente une performance sup\u00e9rieure au m\u00e9thode classique.<\/p>\n<h4><strong>Abstract:<\/strong><\/h4>\n<p>Internet of Things represents a technical challenge for 5G communications due to is characteristic heterogeneity: the 2.4 GHz ISM band, for example, is shared between different kind of technologies, such Wifi, Bluetooth and Zigbee. In addition to the loss of quality of communication, recent studies shows that interference increases significantly the energy consumption. So, dealing with interference becomes an important task to ensure successfull data transmission. The present thesis approaches two aspects of heterogeneous networks. The first part presents an experimental study on the nature of interference between IEEE 802.11 and IEEE 802.15.4 devices, its impacts on the communication reliability and proposes an statistical description of it. The main conclusion of this part is that, on this context, the interference may present a non-Gaussian behavior, more precisely, an impulsive behavior. Recent theoretical works allied with these experimental results show that the alpha-stable distribution is more adequate to represent impulsive noises. It means that the, once optimal, classical communication architectures based on the Gaussian assumption, particularly the Least Squares based channel estimation and linear receiver, are not optimal anymore present a significant loss of performance. The second part presents a robust MIMO architecutre based on Alamouti coding, supervised channel estimation based on Least Absolute Deviation and p-norm receiver with an estimator for p. The proposed approach outperforms the classical method.<\/p>\n<h4><strong>JURY :<\/strong><\/h4>\n<p>\u2013 Laurent\u00a0CLAVIER, IMT Lille-Douai, Directeur de th\u00e8se<\/p>\n<p>\u2013 Olivier BERDER, IRISA \u2013 Institut de Recherche en Informatique et Syst\u00e8mes Al\u00e9atoires, Rapporteur<\/p>\n<p>\u2013 Jean-Yves BAUDAIS, IETR\/INSA Rennes, Rapporteur<\/p>\n<p>\u2013 Virginie DEGARDIN, IEMN, Examinateur<\/p>\n<p>\u2013 Leonardo CARDOSO, INSA-Lyon, Examinateur<\/p>\n<p>\u2013 Nathalie \u00a0MITTON, INRIA Lille-Nord Europe \/ FUN, Examinateur<\/p>\n<p>\u2013 Ahc\u00e8ne BOUNCEUR, Universit\u00e9 de Bretagne Occidentale, Examinateur<\/p>\n<\/div><\/section><\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[199],"tags":[],"class_list":["post-37476","post","type-post","status-publish","format-standard","hentry","category-these"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37476","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/comments?post=37476"}],"version-history":[{"count":0,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/posts\/37476\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=37476"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/categories?post=37476"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/tags?post=37476"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}