Yayin taron FOSDEM 2020 an bayyana shi farkon bude tushen cigaban OpenWifi "Wi-Fi 802.11 a / g / n" Cikakken tsarin tsaga da sifa wanda aka bayyana ta shirye-shirye (SDR, Rafaffen Rediyo) da FPGA.
Abu mai ban sha'awa game da aikin BudeWifi shi ne ba ka damar ƙirƙirar cikakken aiwatarwa mai dacewa da Linux kuma hakan yana sarrafa dukkan abubuwanda aka haɗa da na'urar mara waya, gami da matakan ƙasa-ƙira a cikin adaftan mara waya ta al'ada waɗanda aka aiwatar a matakin kwakwalwan kwamfuta wanda ba zai yiwu ba don tantancewa. Lambar kayan aikin software, da kuma da'irori da bayanin abubuwan toshe kayan aiki a cikin Verilog don yaren FPGA, ana rarraba su a ƙarƙashin lasisin AGPLv3.
BudeWifi yana amfani da tsarin SoftMAC, wanda ke nuna aiwatar da babban ɗigon mara waya ta 802.11 akan gefen mai sarrafawa da kasancewar kasancewar ƙaramin layin MAC akan gefen FPGA. Ana amfani da tsarin mac80211 wanda kernel na Linux yayi amfani dashi azaman mara waya mara waya, yayin da ake yin hulɗa tare da SDR ta hanyar mai sarrafawa na musamman.
Kayan aikin kayan aikin samfuri tabbatar dogara ne akan Xilinx Zynq FPGA da AD9361 Universal Transceiver (RF).
Daga cikin manyan halaye ta hanyar OpenWifi
- Cikakken tallafi don 802.11a / g da tallafi na kashi don 802.11n MCS 0 ~ 7 (har zuwa yanzu PHY rx kawai). Shirye-shiryen suna tallafawa 802.11ax
- 20MHz bandwidth da 70 MHz zuwa 6 GHz zangon mita
- Yanayin aiki: Ad-hoc (cibiyar sadarwar na'urar abokin ciniki), wurin samun dama, tasha da lura
- Aiwatar da FPGA na yarjejeniyar DCF (Tsarin Rarraba ordarfafawa) ta amfani da hanyar CSMA / CA. Yana bayar da Lokacin Tsarin Tsarin (SIFS) a 10us
- Mahimmancin hanyoyin tashar tashoshi masu daidaitawa: RTS / CTS, CTS zuwa kanta, SIFS, DIFS, xIFS, lokacin sakawa, da dai sauransu.
- Tazarar lokaci bisa adiresoshin MAC
- Sauyawa mai sauƙin sauya bandwidth da mita: 2MHz na 802.11ah da 10MHz na 802.11p
- OpenWifi a halin yanzu yana tallafawa dandamali na Xilinx ZC706 FPGA SDR tare da Analog Devices FMCOMMS2 / 3/4 transceivers, da ADRV9361Z7035 SOM + ADRV1CRR-BOB da ADRV9361Z7035 SOM + ADRVCR (FPGA + RF).
Ga gwamnati, za a iya amfani da kayan aikin yau da kullun na Linux kamar ifconfig da iwconfigkazalika da sdrctl mai amfani na musamman wanda ke aiki ta hanyar netlink kuma yana ba ka damar sarrafa SDR a ƙananan ƙananan (magudi rijista, sauya saitunan yankan lokaci, da sauransu).
Daga cikin sauran buɗaɗɗun ayyukan da ke gwaji tare da tarin Wi-Fi, zamu iya ambaton aikin Wime, wanda ke haɓaka IEEE 802.11 a / g / p mai saurin watsawa bisa GNU Radio da PC na yau da kullun.
Hakanan kuma 802.11 ana buɗe tarin software mara waya ta Ziria da Sora (Rediyon Software na Microsoft Research).
Yayin gwajin gwaji, - daga bayanan da aka samo ta hanyar haɗa abokin ciniki tare da adaftan USB TL-WDN4200 N900 zuwa wurin samun dama na tushen OpenWifi, a ba da izinin cimma nasarar 30.6Mbps (TCP) da 38.8Mbps (UDP) lokacin watsa bayanai daga wurin samun damar zuwa abokin ciniki da 17.0Mbps (TCP) da 21.5Mbps (UDP) lokacin aikawa daga abokin harka zuwa wurin samun damar.
Anan akwai demo na wayar da ke haɗawa da hanyar samun damar da ke gudana OpenWifi.
Abubuwan da ke ciki a farkon samfurin OpenWifi kudin kusan Euro 1300, amma ana canza su zuwa faranti masu rahusa. Misali, farashin mafita dangane da Analog Devices ADRV9364-Z7020 zai zama euro 700 kuma ya dogara ne akan ZYNQ NH7020 wanda ke da kusan Euro 400.
Saukewa
A ƙarshe, ga waɗanda ke da sha'awar ƙarin sani game da aikin ko zazzage hoton da aka shirya na OpenWifi iya samun sa ta hanyar zuwa zuwa mahada mai zuwa.
Anan zaku iya samun bayanai game da amfani da girka hoton a kan katin SD (hoton yana kan tsarin ARM na Linux).
Daga cikin abubuwanda suke tallafawa kunshin a halin yanzu, akwai: ADRV9364Z7020 SOM + ADRV1CRR-BOB, Xilinx zed + FMCOMMS2 / 3/4, Xilinx ZCU102 + FMCOMMS2 / 3/4, da Xilinx ZCU102 + ADRV9371.
Source: https://fosdem.org