I-Abstract: Le bhlog yazisa ubukhulu becala iimpawu zesicelo kunye neenzuzo zeteknoloji ye-COFDM ekugqithiseni ngaphandle kwamacingo, kunye neendawo zokusetyenziswa kobuchwephesha.
Amagama angundoqo: non-line-of-sight;Ukuchasana nokuphazamiseka;Hamba ngesantya esiphezulu;COFDM
1. Zeziphi iitekhnoloji eziqhelekileyo zothumelo olungenazingcingo?
Inkqubo yobugcisa esetyenziselwa ukuhanjiswa kwe-wireless inokwahlulwa ngokufanelekileyo kwi-analog transmission, ukuhanjiswa kwedatha / irediyo ye-Intanethi, i-GSM / GPRS CDMA, i-microwave yedijithali (ininzi isasaza i-spectrum microwave), i-WLAN (inethiwekhi engenazingcingo), i-COFDM (i-orthogonal frequency division multiplexing), njl. Phakathi kwabo, iteknoloji yendabuko ayikwazi ukufikelela kwi-broadband high-speed transmission phantsi "kweemeko ezivaliweyo, ezingabonakaliyo kunye nesantya esiphezulu", kunye nophuhliso kunye nokukhula kobuchwepheshe be-OFDM, le ngxaki inesisombululo.
2. Yintoni iteknoloji yeCOFDM?
I-COFDM (ikhowudi ye-orthogonal frequency division multiplexing), oko kukuthi, ikhowudi ye-orthogonal frequency division multiplexing, ukongeza kumsebenzi onamandla wokulungisa impazamo yekhowudi, olona phawu lukhulu kukumodareyitha kwe-multi-carrier, eyahlula ijelo elinikiweyo kwiitshaneli ezininzi ze-orthogonal i-frequency domain, isebenzisa i-subcarrier enye kwi-sub-channel nganye, kwaye ibolise umzila wedatha kwimithombo emininzi ye-sub-data, ukubola izinga lokuhamba kwedatha, le mijelo engaphantsi kwedatha isetyenziselwa ukumodareyitha i-subcarrier nganye ngokwahlukileyo.
Ukuhanjiswa okuhambelanayo kwe-subcarrier nganye kunciphisa ukuxhomekeka kwi-carrier enye, kunye ne-anti-multipath fading ikhono, i-anti-intercode interference (ISI) ikhono, kunye ne-Doppler frequency shift resistance iphuculwe kakhulu.
Ukusetyenziswa kwetekhnoloji ye-COFDM inokuqonda ngenene ukuhanjiswa kwe-broadband ngesantya esiphezulu phantsi komqobo, iimeko ezingabonwayo nezinesantya esiphezulu seselfowuni, okwangoku eyona teknoloji iphambili nethembisayo yokumodareyitha ehlabathini.
3. Ziziphi iingenelo zeteknoloji yeCOFDM kuthumelo locingo?
Ukuhanjiswa okungenacingo kuhamba ngezigaba ezibini: ukuhanjiswa kwe-analog kunye nedijithali.Ukuhanjiswa komfanekiso we-analog kuye kwapheliswa ngokwesiseko kumashishini amaninzi ngenxa yokuphazamiseka kwayo kunye nokuphazamiseka kwe-channel kunye nesandi esikhulu, okukhokelela kwisiphumo esibi kwizicelo ezisebenzayo.
Ngokukhula kwetekhnoloji yeOFDM kunye namacandelo, iimveliso ezisebenzisa itekhnoloji yeCOFDM ziye zaba zezona zixhobo ziphambili zothumelo locingo.Iinzuzo zayo zezi zilandelayo:
I-1, ifanelekile kwisicelo kwi-None-line-of-sight kunye neemeko ezisithintelo ezifana neendawo zasezidolophini, i-suburbs, kunye nezakhiwo, kwaye ibonisa "i-diffraction kunye nokungena" okubalaseleyo.
Isixhobo somfanekiso we-COFDM esingenazingcingo sineengenelo zokudluliselwa kwe-"non-line-of-sight" kunye "ne-diffraction" ngenxa ye-multi-carrier yayo kunye nezinye iimpawu zobugcisa，Kwimimandla yasezidolophini, ezintabeni, ngaphakathi nangaphandle kwezakhiwo kunye nezinye iimeko ezingenakubonwa. kunye nokuphazamiseka, isixhobo sinokufikelela ukuhanjiswa okuzinzile kwemifanekiso enokwenzeka kakhulu, kwaye ayichatshazelwa yimekobume okanye ayichatshazelwa kangako yimekobume.
Ii-antenna ze-Omnidirectional zisetyenziswa ngokubanzi kuzo zombini iziphelo ze-transceiver kunye ne-receiver, kwaye ukuhanjiswa kwenkqubo kulula, kunokwethenjelwa, kwaye kuyaguquguquka.
I-2, ifanelekile kwi-high-speed mobile transmission, kwaye ingasetyenziswa kwizithuthi, iinqanawa, ii-helicopter / drones kunye namanye amaqonga.
I-microwave yemveli, i-LAN engenazingcingo kunye nezinye izixhobo azikwazi ngokuzimeleyo ukuhanjiswa kweselula kwesiphelo se-transceiver kwaye inokuqonda kuphela ukuhanjiswa kwendawo ehambayo ukuya kwindawo esisigxina phantsi kweemeko ezithile.Inkqubo yayo inamakhonkco obugcisa amaninzi, ubunjineli obuntsonkothileyo, ukuthembeka okuncitshisiweyo, kunye neendleko eziphezulu kakhulu.
Nangona kunjalo, kwizixhobo ze-COFDM, ayifuni naziphi na izixhobo ezongezelelweyo, inokuqonda ukusetyenziswa kwe-fixed-mobile-mobile, amagumbi e-mobile-mobile, kwaye ifaneleke kakhulu ukufakwa kwiiplatifomu ezihambayo ezifana neenqwelo, iinqanawa, ii-helicopter / drones, njl. Ukuhanjiswa kunokuthembeka okuphezulu kunye nokusebenza kweendleko eziphezulu.
3, Ilungele ukuhanjiswa kwedatha ngesantya esiphezulu, ngokubanzi ngaphezulu kwe-4Mbps, ukuhlangabezana nokuhanjiswa kwevidiyo ekumgangatho ophezulu kunye nesandi.
Ukongeza kwiimfuno zeekhamera, ividiyo ekumgangatho ophezulu kunye neaudio ineemfuno eziphezulu kakhulu ze-encoding streams kunye namazinga esiteshi, kwaye i-subcarrier nganye ye-COFDM iteknoloji inokukhetha i-QPSK, i-16QAM, i-64QAM kunye nezinye i-modulation ye-high-speed modulation, kunye nereyithi ye-synthesized channel. bukhulu kune-4Mbps ngokubanzi.Ngoko ke, inokudlulisa i-4: 2: 0, 4: 2: 2 kunye nezinye ii-codecs eziphezulu kwi-MPEG2, kwaye isisombululo somfanekiso wesiphelo sokufumana sinokufikelela kwi-1080P, ehlangabezana neemfuno zokuhlalutya emva, ukugcinwa, ukuhlela kunye njalo njalo.
4, Kwiindawo ezintsonkothileyo ze-electromagnetic, i-COFDM inokhuseleko oluhle kakhulu lokuphazamiseka.
Kwinkqubo ye-carrier-carrier, enye i-fading okanye ukuphazamiseka kunokubangela ukuba ikhonkco lonke lonxibelelwano lingaphumeleli, kodwa kwinkqubo ye-COFDM ye-multicarrier, kuphela ipesenti encinci ye-subcarriers iphazamiseka, kwaye ezi zincinci ziyakwazi ukulungiswa kunye neekhowudi zokulungisa iimpazamo. ukuqinisekisa ngempazamo encinci yesantya sothumelo.
5, Ukusetyenziswa kwetshaneli kuphezulu.
Oku kubaluleke kakhulu kwiindawo ezingenazingcingo ezinobuncwane obunqamlekileyo be-spectrum, apho ukusetyenziswa kwe-spectrum yenkqubo kuthanda ukuba yi-2Baud / Hz xa inani le-subcarriers likhulu.
Faka itekhnoloji ye-COFDM kwisidlulisi sevidiyo esingenazingcingo se-IWAVE
Okwangoku i-COFDM isetyenziswa kakhulu kwi-DVB (i-Digital Video Broadcasting), i-DVB-T, i-DVB-S, i-DVB-C njl njl. kwi-high-speed UAV data transmission.
Ngophuhliso lwetekhnoloji, zininzi ngakumbi iidrones kunye ne-UAV esebenzela abantu kwiiprojekthi ezahlukeneyo.I-IWAVE igxile ekuyileni, ekuphuhliseni nasekuthengiseni izisombululo zonxibelelwano ezingenazingcingo kwiidrone zorhwebo kunye neerobhothi.
Izisombululo ziyi-800Mhz, 1.4Ghz, 2.3Ghz, 2.4Ghz kunye ne-2.5Ghz, 5km-8km, 10-16km kunye ne-20-50km ividiyo kunye ne-digital Bi-directional Serial Data Links ngeteknoloji ye-COFDM.
Esona santya siphezulu sokubhabha esixhasayo yi-400km/h.Ngexesha lesantya esiphezulu esinjalo inkqubo inokuqinisekisa ukuba isignali yevidiyo idlulisa ngokuzinzileyo.
Kuluhlu olufutshane lwe-5-8km, i-OFDM isetyenziselwa i-UAV / FPV okanye i-Multi rotor yokuhanjiswa kwevidiyo yevidiyo, isignali ye-Ethernet kunye nedatha ye-serial efanaFIP-2405kwayeI-FIM-2405.
Kuluhlu olude lwe-20-50km, sincoma olu luhlu lweemveliso ezifanaFIM2450kwayeFIP2420
I-IWAVE yamkela itekhnoloji ye-COFDM ephucukileyo kwiimveliso zethu, igxile ekuphuhliseni inkqubo yonxibelelwano olungxamisekileyo yokuthunyelwa ngokukhawuleza.Ngokusekwe kwi-14years yetekhnoloji eqokelelweyo kunye namava, sikhokelela ekuhlaleni ngokuthembeka kwesixhobo esinamandla e-NLOS, uluhlu olude olude kunye nokusebenza okuzinzileyo kwi-UAV, iirobhothi, izithuthi zonxibelelwano ezingenazingcingo.
IiMveliso eziNxulumene neNcomo
Ixesha lokuposa: Apr-20-2023
