{"id":2106,"date":"2026-10-27T11:19:40","date_gmt":"2026-10-27T10:19:40","guid":{"rendered":"https:\/\/au.feri.um.si\/losdv\/projekti\/ofdm-radar\/"},"modified":"2026-10-27T12:05:19","modified_gmt":"2026-10-27T11:05:19","slug":"ofdm-radar","status":"publish","type":"page","link":"https:\/\/au.feri.um.si\/losdv\/en\/projekti\/ofdm-radar\/","title":{"rendered":"OFDM radar on the USRP platform"},"content":{"rendered":"<section class=\"wp-block-group alignfull au-section au-section--dark au-projhero is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group au-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"au-back wp-block-paragraph\"><a href=\"\/losdv\/en\/#iz-nasega-dela\">\u2190 Projects and theses<\/a><\/p>\n\n\n<p class=\"au-eyebrow wp-block-paragraph\">01.10 \u00b7 Master's thesis<\/p>\n\n\n<h1 class=\"wp-block-heading\">OFDM radar on the USRP platform<\/h1>\n\n\n<p class=\"au-lead wp-block-paragraph\">A radar using OFDM modulation \u2013 the same as Wi-Fi and 5G. It is implemented on a USRP software-defined radio, so it can be changed in software.<\/p>\n\n\n<div class=\"anim-box\">\n      <canvas id=\"anim\" aria-label=\"Animation: a transmitted OFDM frame with subcarriers and symbols; after dividing the received frame by the transmitted one, a phase pattern remains whose slope across subcarriers gives the target&#039;s range and across symbols its velocity; a two-dimensional FFT turns it into a range-velocity map with a peak at the target.\"><\/canvas>\n      <div class=\"anim-cap mono\"><span>Illustration \u00b7 OFDM frame \u2192 Rx \/ Tx \u2192 2D FFT \u2192 range and velocity<\/span><button class=\"anim-toggle\" type=\"button\">Stop<\/button><\/div>\n    <\/div>\n<\/div>\n<\/section>\n\n\n\n<section class=\"wp-block-group alignfull au-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group au-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns au-projbody is-layout-flex wp-container-core-columns-is-layout-89c98654 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:60%\">\n<h2 class=\"wp-block-heading\">About the project<\/h2>\n\n\n<p class=\"wp-block-paragraph\">A radar using OFDM modulation \u2013 the same as Wi-Fi and 5G. It is implemented on a USRP software-defined radio, so it can be changed in software.<\/p>\n\n\n<p class=\"wp-block-paragraph\">In OFDM, data are transmitted simultaneously on many narrow subcarriers. When the transmitted signal is reflected from a target, the phase of each subcarrier changes: the reflection delay causes a phase slope across the subcarriers, and the target's motion a phase slope from symbol to symbol. The same signal can therefore carry data and serve as a radar at the same time.<\/p>\n\n\n<h2 class=\"wp-block-heading\">How it works<\/h2>\n\n\n<ol class=\"wp-block-list au-steps\">\n<li><strong>Transmission<\/strong>: the USRP transmits an OFDM frame \u2013 a grid of subcarriers (frequency) and successive symbols (time).<\/li>\n\n\n<li><strong>Reception<\/strong>: the reflected signal is received by a second USRP; the two devices are connected in MIMO mode, and the computer is connected to the USRP N210 via a 10 Gbit\/s link.<\/li>\n\n\n<li><strong>Rx \/ Tx division<\/strong> element by element removes the transmitted data; only the effect of the channel, i.e. the target, remains.<\/li>\n\n\n<li><strong>2D FFT<\/strong>: a transform across the subcarriers gives the range and across the symbols the velocity \u2013 the result is a range-velocity map.<\/li>\n<\/ol>\n<\/div>\n\n\n<div class=\"wp-block-column au-facts is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:40%\">\n<figure class=\"wp-block-table au-facts__table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Type<\/td><td>Master's thesis<\/td><\/tr><tr><td>Field<\/td><td>Radar signal processing<\/td><\/tr><tr><td>Modulation<\/td><td>OFDM<\/td><\/tr><tr><td>Hardware<\/td><td>USRP N210, USRP B210 (MIMO)<\/td><\/tr><tr><td>Link<\/td><td>10 Gbit\/s to the computer<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6aef85273df46&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6aef85273df46\" class=\"wp-block-image size-full wp-lightbox-container\"><img decoding=\"async\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"\/losdv\/wp-content\/uploads\/sites\/4\/2026\/10\/OFDM_radar.png\" alt=\"Program OFDM radar USRP, shema povezave ra\u010dunalnik \u2013 USRP N210 \u2013 USRP B210 in razdaljno-hitrostni mapi\"\/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewbox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><\/figure>\n<\/div>\n<\/div>\n\n\n<div class=\"wp-block-group au-projnav is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><a href=\"\/losdv\/en\/projekti\/raketa-pristanek\/\"><span>\u2190 Previous<\/span>A rocket that lands by itself<\/a><\/p>\n\n\n<p class=\"wp-block-paragraph\"><a href=\"\/losdv\/en\/projekti\/uwb-lokalizacija\/\"><span>Next \u2192<\/span>Localisation with ultra-wideband radio<\/a><\/p>\n<\/div>\n<\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>\u2190 Projekti in zaklju\u010dna dela 01.10 \u00b7 Magistrsko delo OFDM radar na platformi USRP Radar, ki uporablja modulacijo OFDM \u2013 enako kot Wi-Fi in 5G. Izveden je na programsko dolo\u010denem radiu USRP, zato ga lahko spreminjamo kar v programski opremi. Ponazoritev \u00b7 okvir OFDM \u2192 Rx \/ Tx \u2192 2D FFT \u2192 razdalja in hitrostUstavi [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2098,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"page-brez-naslova","meta":{"footnotes":""},"class_list":["post-2106","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/2106","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/comments?post=2106"}],"version-history":[{"count":1,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/2106\/revisions"}],"predecessor-version":[{"id":2119,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/2106\/revisions\/2119"}],"up":[{"embeddable":true,"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/pages\/2098"}],"wp:attachment":[{"href":"https:\/\/au.feri.um.si\/losdv\/en\/wp-json\/wp\/v2\/media?parent=2106"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}