{"id":41277,"date":"2020-02-07T09:28:08","date_gmt":"2020-02-07T06:28:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/proekt-openwifi-s-realizacziej-otkrytogo-wi-fi-chipa-na-baze-fpga-i-sdr"},"modified":"2020-02-07T09:28:08","modified_gmt":"2020-02-07T06:28:08","slug":"proekt-openwifi-s-realizacziej-otkrytogo-wi-fi-chipa-na-baze-fpga-i-sdr","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/proekt-openwifi-s-realizacziej-otkrytogo-wi-fi-chipa-na-baze-fpga-i-sdr","title":{"rendered":"Il progetto OpenWifi con implementazione di un chip Wi-Fi open-source basato su FPGA e SDR","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Alla conferenza FOSDEM 2020 <noindex><a rel=\"nofollow\" href=\"https:\/\/fosdem.org\/2020\/schedule\/event\/fsr_openwifi\/\">presentato<\/a><\/noindex> progetto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/open-sdr\/openwifi\">OpenWifi<\/a><\/noindex>, che sviluppa la prima implementazione open source dell'intero stack Wi-Fi 802.11a\/g\/n, la forma del segnale e la modulazione delle quali sono definite tramite software (SDR, Software Defined Radio). OpenWifi consente di creare un'implementazione completamente controllabile di tutti i componenti di un dispositivo wireless, compresi i livelli di basso livello, solitamente implementati in adattatori wireless con chip non verificabili. Il codice <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/open-sdr\/openwifi\">dei componenti software<\/a><\/noindex>, cos\u00ec come <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/open-sdr\/openwifi-hw\">schemi e descrizioni<\/a><\/noindex>  di moduli hardware in linguaggio Verilog per FPGA sono distribuiti sotto licenza AGPLv3.<\/p>\n<p>La componente hardware del prototipo funzionante dimostrato si basa su FPGA Xilinx Zynq e su un trasmettitore-ricevitore universale (RF) AD9361. In OpenWifi viene utilizzata un'architettura SoftMAC, che prevede l'implementazione dello stack wireless 802.11 (high-MAC) dal lato del driver e la presenza di un livello low-MAC dal lato FPGA. Come stack wireless viene utilizzato il sottosistema mac80211 fornito dal kernel Linux. L'interazione con l'SDR avviene tramite un driver specifico.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/raw.githubusercontent.com\/open-sdr\/openwifi\/master\/openwifi-arch.jpg\"><img decoding=\"async\" alt=\"Il progetto OpenWifi con implementazione di un chip Wi-Fi open-source basato su FPGA e SDR\" src=\"\/wp-content\/uploads\/2020\/02\/e3604cad3b6d4e0d0c2491fa1e6969fe.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Funzionalit\u00e0 principali:<\/p>\n<ul>\n<li class=\"l\"> Supporto completo per 802.11a\/g e supporto parziale per 802.11n MCS 0~7 (attualmente solo PHY rx). \u00c8 prevista la supporto per 802.11ax;\n<li class=\"l\"> Larghezza di banda 20MHz e gamma di frequenze da 70 MHz a 6 GHz;\n<li class=\"l\"> Modalit\u00e0 operative: <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%91%D0%B5%D1%81%D0%BF%D1%80%D0%BE%D0%B2%D0%BE%D0%B4%D0%BD%D0%B0%D1%8F_ad-hoc-%D1%81%D0%B5%D1%82%D1%8C\">Ad-hoc<\/a><\/noindex> (rete di dispositivi client), punto di accesso, stazione e monitoraggio;\n<li class=\"l\"> Implementazione su FPGA del protocollo a livello di collegamento <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Distributed_coordination_function\">DCF<\/a><\/noindex> (Distributed Coordination Function), utilizzando il metodo CSMA\/CA. Viene garantito un tempo di elaborazione del frame (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Short_Interframe_Space\">SIFS<\/a><\/noindex>) a livello di 10us;\n<li class=\"l\"> Parametri configurabili per la priorit\u00e0 di accesso al canale: durata RTS\/CTS, CTS-to-self, SIFS, DIFS, xIFS, slot-time, ecc.\n<li class=\"l\">  Quantizzazione del tempo (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Time_slicing_(digital_broadcasting)\">Time slicing<\/a><\/noindex>) basata su indirizzo MAC;\n<li class=\"l\"> Larghezza di banda e frequenza facilmente modificabili:<br \/>\n        2MHz per 802.11ah e 10MHz per 802.11p;<\/p>\n<\/ul>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1580822257.png\"><img decoding=\"async\" alt=\"Il progetto OpenWifi con implementazione di un chip Wi-Fi open-source basato su FPGA e SDR\" src=\"\/wp-content\/uploads\/2020\/02\/32260d0341871b1d4b7ba65c5a42ab6c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Attualmente, OpenWifi supporta <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/open-sdr\/openwifi-hw\">supporto<\/a><\/noindex> piattaforme SDR basate su FPGA<br \/>\nXilinx ZC706 con ricevitori Analog Devices FMCOMMS2\/3\/4, nonch\u00e9 combinazioni (FPGA + RF) ADRV9361Z7035 SOM + ADRV1CRR-BOB e ADRV9361Z7035 SOM + ADRV1CRR-FMC. \u00c8 stato creato un <noindex><a rel=\"nofollow\" href=\"https:\/\/users.ugent.be\/~xjiao\/\">immagine pronta<\/a><\/noindex> per schede SD basate su ARM Linux. \u00c8 prevista la supporto per combinazioni ADRV9364Z7020 SOM + ADRV1CRR-BOB, Xilinx Zed + FMCOMMS2\/3\/4, Xilinx ZCU102 + FMCOMMS2\/3\/4 e<br \/>\nXilinx ZCU102 + ADRV9371. Il costo dei componenti utilizzati nel primo prototipo di OpenWifi \u00e8 stato di circa 1300 euro, ma si sta portando avanti la migrazione su schede pi\u00f9 economiche. Ad esempio, il costo della soluzione basata su <noindex><a rel=\"nofollow\" href=\"https:\/\/wiki.analog.com\/resources\/eval\/user-guides\/adrv9364-z7020\">Analog Devices ADRV9364-Z7020<\/a><\/noindex> sar\u00e0 di 700 euro, mentre su <noindex><a rel=\"nofollow\" href=\"https:\/\/aliexpress.ru\/item\/4000498157487.html\">ZYNQ NH7020<\/a><\/noindex> \u2014 400 euro.<\/p>\n<p>Il test delle prestazioni della connessione client tramite l'adattatore USB TL-WDN4200 N900 al punto di accesso basato su OpenWifi ha permesso di raggiungere una larghezza di banda di 30.6Mbps (TCP) e 38.8Mbps (UDP) durante il trasferimento di dati dal punto di accesso al client e 17.0Mbps (TCP) e 21.5Mbps (UDP) durante il trasferimento dal client al punto di accesso. Per la gestione possono essere utilizzati strumenti standard di Linux, come ifconfig e iwconfig, oltre a un'utility specializzata chiamata sdrctl, che opera tramite netlink e consente di gestire il funzionamento dell'SDR a basso livello (manipolando registri, modificando impostazioni di quantizzazione del tempo, ecc.).<\/p>\n<p><center><video  controls=\"\" style=\"width: 640px; height: 400px; max-width:100%\"><source src=\"https:\/\/video.fosdem.org\/2020\/AW1.120\/fsr_openwifi.mp4\" type=\"video\/mp4\"><\/video><\/center><\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"NpjEaszd5u4\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/NpjEaszd5u4\/hqdefault.jpg\" alt=\"Riproduci video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>Tra gli altri progetti open source che sperimentano con lo stack Wi-Fi, si pu\u00f2 citare il progetto <noindex><a rel=\"nofollow\" href=\"https:\/\/www.wime-project.net\/\">Wime<\/a><\/noindex>, che sviluppa un trasmettitore compatibile con IEEE 802.11 a\/g\/p <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/bastibl\/gr-ieee802-11\">basato su GNU Radio e un comune PC. Gli stack wireless open source 802.11 stanno anche sviluppando progetti<\/a><\/noindex> Ziria <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/dimitriv\/Ziria\">Sora<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/Sora\">(Microsoft Research Software Radio).<\/a><\/noindex> (Microsoft Research Software Radio).<br \/>\n<center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1580821775.png\"><img decoding=\"async\" alt=\"Il progetto OpenWifi con implementazione di un chip Wi-Fi open-source basato su FPGA e SDR\" src=\"\/wp-content\/uploads\/2020\/02\/2c53b93159920132a1cdce064871024c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52309\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0430 \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0435\u0439 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 FOSDEM 2020 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u043f\u0440\u043e\u0435\u043a\u0442 OpenWifi, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0438\u0439 \u043f\u0435\u0440\u0432\u0443\u044e \u043e\u0442\u043a\u0440\u044b\u0442\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043f\u043e\u043b\u043d\u043e\u0433\u043e \u0441\u0442\u0435\u043a\u0430 Wi-Fi 802.11a\/g\/n, \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0438 \u043c\u043e\u0434\u0443\u043b\u044f\u0446\u0438\u044f \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0437\u0430\u0434\u0430\u0451\u0442\u0441\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e (SDR, Software Defined Radio). OpenWifi \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0441\u043e\u0437\u0434\u0430\u0442\u044c \u043f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043f\u043e\u0434\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0432\u0441\u0435\u0445 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043d\u0438\u0437\u043a\u043e\u0443\u0440\u043e\u0432\u043d\u0435\u0432\u044b\u0435 \u0441\u043b\u043e\u0438, \u0432 \u043e\u0431\u044b\u0447\u043d\u044b\u0445 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0445 \u0430\u0434\u0430\u043f\u0442\u0435\u0440\u0430\u0445 \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u0435\u043c\u044b\u0435 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0445 \u0434\u043b\u044f \u0430\u0443\u0434\u0438\u0442\u0430 \u0447\u0438\u043f\u043e\u0432. \u041a\u043e\u0434 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":41278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-41277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0430 \u043f\u0440\u043e\u0448\u0435\u0434\u0448\u0435\u0439 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0438\u0438 FOSDEM 2020 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u043f\u0440\u043e\u0435\u043a\u0442 OpenWifi, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0438\u0439 \u043f\u0435\u0440\u0432\u0443\u044e \u043e\u0442\u043a\u0440\u044b\u0442\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043f\u043e\u043b\u043d\u043e\u0433\u043e \u0441\u0442\u0435\u043a\u0430 Wi-Fi 802.11a\/g\/n, \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0438 \u043c\u043e\u0434\u0443\u043b\u044f\u0446\u0438\u044f \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0437\u0430\u0434\u0430\u0451\u0442\u0441\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e (SDR, Software Defined Radio). 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