{"id":26585,"date":"2018-10-19T12:11:17","date_gmt":"2018-10-19T10:11:17","guid":{"rendered":"https:\/\/www.iemn.fr\/?page_id=26585"},"modified":"2025-09-03T10:36:53","modified_gmt":"2025-09-03T08:36:53","slug":"systemes-de-communications-multi-utilisateurs","status":"publish","type":"page","link":"https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/systemes-de-communications-multi-utilisateurs","title":{"rendered":"Multi-User Communications Systems"},"content":{"rendered":"<div id='layer_slider_1'  class='avia-layerslider main_color avia-shadow  avia-builder-el-0  el_before_av_submenu  avia-builder-el-first  container_wrap sidebar_right'  style='height: 261px;'  ><div id=\"layerslider_47_184g1oiwy9ye6\" data-ls-slug=\"homepageslider\" class=\"ls-wp-container fitvidsignore ls-selectable\" style=\"width:1140px;height:260px;margin:0 auto;margin-bottom: 0px;\"><div class=\"ls-slide\" data-ls=\"bgposition:50% 50%;duration:6000;transition2d:5;\"><img loading=\"lazy\" decoding=\"async\" width=\"2600\" height=\"270\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun.jpg\" class=\"ls-bg\" alt=\"COMNUM\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun.jpg 2600w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun-300x31.jpg 300w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun-768x80.jpg 768w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun-1030x107.jpg 1030w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun-1500x156.jpg 1500w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2018\/10\/sliders_groupe_commun-705x73.jpg 705w\" sizes=\"auto, (max-width: 2600px) 100vw, 2600px\" \/><ls-layer style=\"font-size:14px;text-align:left;font-style:normal;text-decoration:none;text-transform:none;font-weight:700;letter-spacing:0px;background-position:0% 0%;background-repeat:no-repeat;mix-blend-mode:normal;top:231px;left:0px;height:30px;width:320px;line-height:32px;color:#ffffff;border-radius:6px 6px 6px 6px;padding-left:50px;background-color:rgba(0, 0, 0, 0.57);\" class=\"ls-l ls-ib-icon ls-text-layer\" data-ls=\"minfontsize:0;minmobilefontsize:0;\"><i class=\"fa fa-user-circle\" style=\"color:#f2f2f2;margin-right:0.8em;font-size:1em;transform:translateY( -0.125em );\"><\/i>GROUPE DE RECHERCHE : COMNUM<\/ls-layer><\/div><\/div><\/div>\n<div id='sub_menu1'  class='av-submenu-container av-jrqfadqy-ce2f2ab09b07c9cd48b0b2cdd423b7d9 footer_color  avia-builder-el-1  el_after_av_layerslider  el_before_av_heading  submenu-not-first container_wrap sidebar_right' style='z-index:301' ><div class='container av-menu-mobile-disabled av-submenu-pos-left'><ul id='av-custom-submenu-1' class='av-subnav-menu' role='menu'>\n<li class='menu-item av-3hxm0mx-425b7eae32537e45ec813825fae42c85 menu-item-top-level menu-item-top-level-1' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Introduction<\/span><\/a><\/li>\n<li class='menu-item av-2twcr6h-23ccafb8630bc461daf77fafa18a3d76 menu-item-top-level menu-item-top-level-2' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/membres'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Members<\/span><\/a><\/li>\n<li class='menu-item av-2infunt-86931410ea477b7a57713cafe834a8b0 menu-item-top-level menu-item-top-level-3' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/transports-intelligents'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Intelligent Transportation<\/span><\/a><\/li>\n<li class='menu-item av-254jk55-f9e4c5540b69385ed1306181d72a7954 menu-item-top-level menu-item-top-level-4' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/transmission-video-numerique'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Digital video transmission system<\/span><\/a><\/li>\n<li class='menu-item av-1mzf1ix-95e561e625c8247ca10ac1e23609d594 menu-item-top-level menu-item-top-level-5' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/systemes-de-communications-multi-utilisateurs'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Multi-User Communication Systems<\/span><\/a><\/li>\n<li class='menu-item av-3hxm0mx-86095cf508d8c74fa493bd2fbf050293 menu-item-top-level menu-item-top-level-6' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes\/comnum\/projet-interreg-secuweb-crosss3'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Projet Interreg CrossS3 SecuWeb<\/span><\/a><\/li>\n<li class='menu-item av-10c8c1l-72617687695e6fe6818c4672acd1cd1b menu-item-top-level menu-item-top-level-7' role='menuitem'><a href='https:\/\/www.iemn.fr\/en\/la-recherche\/les-groupes'  ><span class='avia-bullet'><\/span><span class='avia-menu-text'>Other groups<\/span><\/a><\/li>\n<\/ul><\/div><\/div><div id='after_submenu_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-26585'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-k9tpuh-1f559e2aa06fb12255dcbfe2fb47eff7\">\n#top .av-special-heading.av-k9tpuh-1f559e2aa06fb12255dcbfe2fb47eff7{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-k9tpuh-1f559e2aa06fb12255dcbfe2fb47eff7 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-k9tpuh-1f559e2aa06fb12255dcbfe2fb47eff7 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-k9tpuh-1f559e2aa06fb12255dcbfe2fb47eff7 av-special-heading-h3  avia-builder-el-2  el_after_av_submenu  el_before_av_textblock  avia-builder-el-first'><h3 class='av-special-heading-tag'  itemprop=\"headline\"  >Theme: Multi-User Communication Systems, Cognitive Radio and Radio over Fiber<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div>\n<section  class='av_textblock_section av-jnfuwmi8-d9742affa8fc24623f0354760489b4dd'   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div id=\"region-content\" class=\"grid-9 region region-content\">\n<div class=\"region-inner region-content-inner\">\n<div id=\"block-system-main\" class=\"block block-system block-main block-system-main odd block-without-title\">\n<div class=\"block-inner clearfix\">\n<div class=\"content clearfix\">\n<article id=\"node-page-5764\" class=\"node node-page node-published node-not-promoted node-not-sticky author-cdebail odd clearfix\">\n<div class=\"content clearfix\">\n<div class=\"field field-name-body field-type-text-with-summary field-label-hidden\">\n<div class=\"field-items\">\n<div class=\"field-item even\">\n<p><strong>Manager:<\/strong>\u00a0<strong>Iyad DAYOUB<\/strong>, MCF-HDR<br \/>\n<span style=\"color: #f16728\"><strong>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mqde7m-1-ec2c04f41b7420486817f2e799a043b8\">\n.av_font_icon.av-mqde7m-1-ec2c04f41b7420486817f2e799a043b8{\ncolor:#f16728;\nborder-color:#f16728;\n}\n.av_font_icon.av-mqde7m-1-ec2c04f41b7420486817f2e799a043b8 .av-icon-char{\nfont-size:25px;\nline-height:25px;\n}\n<\/style>\n<span  class='av_font_icon av-mqde7m-1-ec2c04f41b7420486817f2e799a043b8 avia_animate_when_visible av-icon-style- avia-icon-pos-left avia-icon-animate'><span class='av-icon-char' aria-hidden='true' data-av_icon='\ue805' data-av_iconfont='entypo-fontello' ><\/span><\/span><\/strong><\/span>Contact : Iyad.dayoub <img loading=\"lazy\" decoding=\"async\" class=\"align=absbottom wp-image-73424\" src=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2035\/05\/arobase_noir.png\" alt=\"\" width=\"14\" height=\"14\" srcset=\"https:\/\/www.iemn.fr\/wp-content\/uploads\/2035\/05\/arobase_noir.png 24w, https:\/\/www.iemn.fr\/wp-content\/uploads\/2035\/05\/arobase_noir-12x12.png 12w\" sizes=\"auto, (max-width: 14px) 100vw, 14px\" \/> univ-valenciennes.fr<\/p>\n<p align=\"justify\">This research theme concerns intelligent, multi-user, cooperative and opportunistic communication systems. We are interested in the development of transmission, multiple access and reception technologies for <strong>radio frequency communication systems<\/strong> as well as for <strong>mixed radio and optical networks<\/strong>. Intelligent Transportation Systems <strong>intelligent transport<\/strong> are one of the applications targeted. The work covered is mainly :<\/p>\n<h4>Radio frequency communications :<\/h4>\n<ul>\n<li>\n<p align=\"justify\"><strong>Cognitive Radio:<\/strong> We have seen an explosion of new radio standards, with the terminal evolving in an increasingly heterogeneous and complex radio landscape. This raises problems of system cohabitation, interoperability between systems and frequency availability. These systems must guarantee availability, service continuity, traffic heterogeneity, robustness and quality of service for the applications concerned, sometimes in a context of high mobility and regardless of the environments crossed. These requirements of dynamic reconfigurability are common with the world of telecommunications and solutions are sought through the development of the \"intelligent\" radio allowing to realize, via software functions, the functions currently ensured by hardware components in the radio modems. In this context, we are interested in the following problems <strong>blind identification and classification<\/strong> of waveforms of 2nd, 3rd and 4th generation telecommunications systems as well as<strong> adaptive radio channel estimation<\/strong> in particular <strong>high mobility<\/strong> (i.e. rail, TGV).<\/p>\n<p>Related keywords: MIMO, OFDM, blind detection, spatial correlation, higher order statistics, adaptive channel estimation, intelligent mobile terminal<\/li>\n<\/ul>\n<h4 align=\"justify\">Multi-user communicating systems:<\/h4>\n<p align=\"justify\">In the context of multi-cell networks, we are interested in the problem of low spectral efficiency at the edge of the cell, due to the high level of interference between the cells in this area.<\/p>\n<p><strong>Within this framework, three themes are addressed:<\/strong><\/p>\n<ol>\n<li>\n<p align=\"justify\">The search for cooperation strategies between the base stations of the network (downlink), with a distributed scheme constraint (decisions are made at the level of each base station, and not in a centralized manner). This corresponds to a virtual MIMO approach. We have proposed a cooperation scheme that takes advantage of the spatial diversity, but also of the frequency diversity of the network. This is implemented through an adaptation of the optimal space-time coding: the golden code.<\/p>\n<\/li>\n<li>\n<p align=\"justify\">The search for a statistical model of the power of inter-cell interference experienced by a network user. The interest of such a model is to facilitate the analysis and the simulation of the network, in particular in the search for solutions aiming at limiting these interferences. We have implemented a semi-analytical method that allows us to obtain a reliable model, including path-loss, shadowing and multipath propagation phenomena, for the downstream channel, and in a distributed environment where the resource allocation is opportunistic (optimal from a sum flow point of view). The proposed statistical model is derived from a Burr's law, and is parameterized by the importance parameter of the shadowing effect \u03c3dB<\/p>\n<\/li>\n<li>L&rsquo;allocation de ressource avec feedback de type ARQ (approche Xlayer).Mots-cl\u00e9 associ\u00e9s\u00a0: R\u00e9seaux Coop\u00e9ratifs, Virtual MIMO, Mod\u00e9lisation des Interf\u00e9rences, Cross-Layer Design, R\u00e9seaux ad hoc.<\/li>\n<\/ol>\n<h4 align=\"justify\">Mixed Radio-Optical Networks :<\/h4>\n<p align=\"justify\">Due to their unbeatable throughput, single-mode (SMF) or multi-mode (MMF) fiber links represent an ever-growing infrastructure today. Thus, the need for a mixed radio-fiber technology is becoming apparent in order to satisfy requirements (i.e. high-speed services) and to take advantage of the complementarity of the two technologies.<\/p>\n<p><strong>In this context, two themes are developed:\u00a0<\/strong><\/p>\n<ol>\n<li>\n<p align=\"justify\">Optical CDMA and multiple access interference processing: the direct radio transmission model on fiber limits its use to radio applications only. In this context, we are interested in the optical CDMA multiple access technique (i.e. more specifically in the treatment of multiple access interference) on SMF fiber. Thus, we develop optical multi-user detectors (O-MUD) based on the parallel (SPIC) and serial (SIC) cancellation of multiple access interferences associated with optical codes in 1 and 2 Dimensions (i.e. OOC, PC).<\/p>\n<\/li>\n<li>\n<p align=\"justify\">Optical MIMO: With its enormous bandwidth, the MMF \ufb01bre appears to be the only media capable of delivering high-speed multi-service in enterprise and \"in-door\" networks. An MMF network can be the network backbone that feeds \ufb01xe-\ufb01laire services (such as GbE data services), as well as wireless services (e.g., IEEE 802.x) throughout the building using a multiplexing technique. In this context, we have performed a complete analytical development of an optical MIMO system using the principle of mode group diversity multiplexing (MGDM). We are also interested in the optimization of these systems, namely: optical power and frequency allocation per service, modeling and decomposition of the optical MIMO channel, cross-layer (PHY-MAC) for better capacity and\/or quality.<\/p>\n<p>Related keywords: RoF, CDMA-Optique, MUD-Optique, SIC-Optique, PIC-Optique, MIMO-Optique, MGDM, Cross-Layer<\/li>\n<\/ol>\n<p align=\"justify\">This work is supported by several projects and contacts:  programme CPER \u00ab CISIT \u00bb, Europe\/INTERREG \u00ab ROSETTE \u00bb, Europe\/INTERREG \u00ab EXTRACTT \u00bb, ANR\/CORRIDOR, IRT\/RAILENIUM,\u2026<\/p>\n<h4>Academic collaborations:<\/h4>\n<ul>\n<li><strong>National : <\/strong>IFSTTAR, UBO-LabSTICC, TELECOM Bretagne, Supelec, EURECOM, XLIM, INSA de Rouen (LITIS),<\/li>\n<li><strong>International:<\/strong> Concordia University (Canada), Kent University (UK), Detroit University (USA), EPT and ENIT (Tunis), Damascus University, ENSAT (Tangiers).<\/li>\n<li><strong>Industry:<\/strong> THALES, SNCF, RFF, Micromodule, Bombardier<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":2,"featured_media":0,"parent":26078,"menu_order":21,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-26585","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"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=26585"}],"version-history":[{"count":4,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26585\/revisions"}],"predecessor-version":[{"id":74877,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26585\/revisions\/74877"}],"up":[{"embeddable":true,"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/pages\/26078"}],"wp:attachment":[{"href":"https:\/\/www.iemn.fr\/en\/wp-json\/wp\/v2\/media?parent=26585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}