Umbono: Le bhulogi yethula ikakhulukazi izici zohlelo lokusebenza kanye nezinzuzo zobuchwepheshe be-COFDM ekudluliselweni okungenantambo, kanye nezindawo zokusetshenziswa kobuchwepheshe.
Amagama angukhiye: okungezona umugqa wokubona;Anti-ukuphazamiseka;Hamba ngesivinini esikhulu;COFDM
1. Yibuphi ubuchwepheshe obujwayelekile bokudlulisa okungenantambo?
Uhlelo lobuchwepheshe olusetshenziswa ekudluliselweni okungenantambo lungahlukaniswa ngokulingana ngokudluliswa kwe-analog, ukudluliswa kwedatha/umsakazo we-inthanethi, i-GSM/GPRS CDMA, i-digital microwave (ikakhulukazi i-spread spectrum microwave), i-WLAN (inethiwekhi engenazintambo), i-COFDM (i-orthogonal frequency division multiplexing), njll. Phakathi kwazo, ubuchwepheshe bendabuko abukwazi ukuzuza ukudluliswa kwe-broadband high-speed ngaphansi "kwezimo zeselula ezivinjiwe, ezingabonwayo nezinesivinini esikhulu", ngokuthuthukiswa nokuvuthwa kobuchwepheshe be-OFDM, le nkinga inesixazululo.
2. Buyini ubuchwepheshe be-COFDM?
I-COFDM (i-coded orthogonal frequency division multiplexing), okungukuthi, ukufaka ikhodi nge-orthogonal frequency division multiplexing, ngaphezu komsebenzi onamandla wokulungisa iphutha lokubhala ikhodi, isici esikhulu kunazo zonke ukuguquguquka kwezinkampani eziningi, okuhlukanisa isiteshi esinikeziwe kumashaneli amaningi ama-orthogonal isizinda se-frequency, isebenzisa inkampani yenethiwekhi eyodwa esiteshini esincanyana ngasinye, futhi ibolisa ukusakazwa kwedatha kube imifudlana eminingana yedatha encane, ibola izinga lokugeleza kwedatha, le mifudlana yedatha engaphansi bese isetshenziselwa ukulungisa isithwali ngasinye ngokuhlukana.
Ukudluliswa okuhambisanayo kwenkampani yenethiwekhi ngayinye kunciphisa ukuncika kusithwali esisodwa, futhi ikhono layo lokulwa nokufiphala kwe-multipath, ikhono le-anti-intercode interference (ISI), kanye nokumelana ne-Doppler frequency shift kuthuthukisiwe kakhulu.
Ukusetshenziswa kobuchwepheshe be-COFDM kungabona ngempela ukudluliswa kwe-broadband ngesivinini esiphezulu ngaphansi kwezimo zeselula ezingabonwayo nezinesivinini esikhulu, okwamanje okuwubuchwepheshe bokumodulisa obuphambili kakhulu nobuthembisa kakhulu emhlabeni.
3. Yiziphi izinzuzo ze-COFDM ubuchwepheshe ekudluliselweni okungenantambo?
Ukudlulisa okungenantambo kuhamba ngezigaba ezimbili: i-analog ne-digital transmission.Ukudluliswa kwesithombe se-analogi kuqediwe ngokuyisisekelo ezimbonini eziningi ngenxa yokugxambukela kwakho kanye nokuphazamiseka kwesiteshi esihlangene kanye nomsindo ophakeme, okubangele umphumela ongemuhle ezinhlelweni zokusebenza.
Ngokuvuthwa kobuchwepheshe be-OFDM kanye nezingxenye, imikhiqizo esebenzisa ubuchwepheshe be-COFDM isiphenduke imishini yokudlulisa okungenantambo ethuthuke kakhulu.Izinzuzo zayo zimi kanje:
I-1, ifaneleka ukufakwa ku-None-line-of-sight kanye nezindawo ezivimbekile njengezindawo zasemadolobheni, izindawo ezingaphansi kwedolobha, nezakhiwo, futhi ikhombisa ikhono elihle kakhulu elithi "diffraction kanye nokungena".
Imishini yesithombe engenantambo ye-COFDM inezinzuzo zokudlulisela "okungewona umugqa wokubona" kanye "nokudiffraction" ngenxa yokuthwala kwayo okuningi nezinye izici zobuchwepheshe，Ezindaweni zasemadolobheni, ezintabeni, ngaphakathi nangaphandle kwezakhiwo nezinye izindawo ezingenakubonwa. futhi ivinjiwe, idivayisi ingafinyelela ukudluliswa okuzinzile kwezithombe ngamathuba aphezulu, futhi ayithinteki imvelo noma ithintwa kancane imvelo.
Ama-antenna e-Omnidirectional ngokuvamile asetshenziswa kuzo zombili iziphetho ze-transceiver nomamukeli, futhi ukuthunyelwa kwesistimu kulula, kuthembekile, futhi kuyavumelana nezimo.
I-2, ilungele ukuhanjiswa kweselula ngesivinini esikhulu, futhi ingasetshenziswa ezimotweni, imikhumbi, izindiza ezinophephela emhlane/ama-drones namanye amapulatifomu.
I-microwave yendabuko, i-LAN engenawaya nezinye izisetshenziswa azikwazi ngokuzimele ukuqaphela ukudluliswa kweselula kwesiphetho se-transceiver futhi zingabona kuphela ukudluliswa kwephoyinti leselula liye endaweni engashintshi ngaphansi kwezimo ezithile.Uhlelo lwayo lunezixhumanisi eziningi zobuchwepheshe, ubunjiniyela obuyinkimbinkimbi, ukwethembeka okuncishisiwe, kanye nezindleko eziphakeme kakhulu.
Kodwa-ke, kumishini ye-COFDM, ayidingi noma yimaphi amadivaysi angeziwe, ingakwazi ukubona ukusetshenziswa kwamakamelo angaguquki, amaselula-amaselula, futhi ifaneleka kakhulu ukufakwa kumapulatifomu eselula njengezimoto, imikhumbi, izindiza ezinophephela emhlane/ama-drones, njll. Ukudluliswa kunokwethenjelwa okuphezulu nokusebenza kwezindleko eziphezulu.
3, Ilungele ukudluliswa kwedatha ngesivinini esikhulu, ngokuvamile esikhulu kuno-4Mbps, ukuhlangabezana nokuhanjiswa kwevidiyo nomsindo wekhwalithi ephezulu.
Ngaphezu kwezimfuneko zamakhamera, ividiyo yekhwalithi ephezulu nomsindo kunezidingo eziphakeme kakhulu zokusakaza ngekhodi namazinga esiteshi, futhi inkampani engaphansi ngayinye yobuchwepheshe be-COFDM ingakhetha i-QPSK, i-16QAM, i-64QAM nokunye ukushintshwa kwesivinini esiphezulu, kanye nezinga lesiteshi esihlanganisiwe. ngokuvamile inkulu kuno-4Mbps.Ngakho-ke, ingadlulisela u-4:2:0, 4:2:2 namanye ama-codec ekhwalithi ephezulu ku-MPEG2, futhi ukulungiswa kwesithombe sokuphela kokwamukela kungafinyelela ku-1080P, ehlangabezana nezidingo zokuhlaziywa kwangemuva, ukugcinwa, ukuhlela kanye njalonjalo.
4, Ezindaweni eziyinkimbinkimbi ze-electromagnetic, i-COFDM inokuvikeleka okuhle kakhulu ekuphazamisekeni.
Kusistimu yenkampani yenethiwekhi eyodwa, ukufiphala okukodwa noma ukuphazamiseka kungabangela ukuthi sonke isixhumanisi sokuxhumana sihluleke, kodwa ohlelweni lwe-COFDM yezinkampani eziningi, amaphesenti amancane kuphela ama-subcarriers aphazanyiswa, futhi lezi ziteshi ezincane zingaphinde zilungiswe ngamakhodi okulungisa amaphutha. ukuze kuqinisekiswe izinga elincane lephutha lokudlulisela.
5, Ukusetshenziswa kwesiteshi kuphezulu.
Lokhu kubaluleke kakhulu ezindaweni ezingenazintambo ezinezinsiza ze-spectrum ezilinganiselwe, lapho ukusetshenziswa kwe-spectrum yesistimu kuvame ukuba ngu-2Baud/Hz uma inani labathwali abangaphansi likhulu.
Sebenzisa ubuchwepheshe be-COFDM kusidlulisi sevidiyo esingenantambo se-IWAVE
Njengamanje i-COFDM isetshenziswa kabanzi ku-DVB (Ukusakaza Kwevidiyo Yedijithali), i-DVB-T, i-DVB-S, i-DVB-C njll.
Ngokuthuthuka kobuchwepheshe, kunama-drones amaningi kanye nama-UAV asebenzela abantu kumaphrojekthi ahlukene.I-IWAVE igxile ekuklameni, ekuthuthukiseni, nasekuthengiseni izixazululo zokuxhumana okungenantambo zama-drones ezentengiselwano namarobhothi.
Izixazululo ngu-800Mhz, 1.4Ghz, 2.3Ghz, 2.4Ghz no-2.5Ghz, 5km-8km, 10-16km kanye nevidiyo engu-20-50km kanye nezixhumanisi ze-Bi-directional Serial Data Links ezinobuchwepheshe be-COFDM.
Isivinini esikhulu sokundiza esisekela uhlelo lwethu ngu-400km/h.Phakathi nesivinini esinjalo isistimu ingaqinisekisa futhi ukudluliswa kwesignali yevidiyo okuzinzile.
Kubanga elifushane lika-5-8km, i-OFDM isetshenziselwa i-UAV/FPV noma i-Multi rotor yokudlulisa ividiyo yevidiyo, isignali ye-Ethernet kanye nedatha ye-serial efanaI-FIP-2405futhiI-FIM-2405.
Ngobubanzi obude be-20-50km, sincoma lolu chungechunge lwemikhiqizo efanaI-FIM2450futhiI-FIP2420
I-IWAVE yamukela ubuchwepheshe obuthuthukisiwe be-COFDM emikhiqizweni yethu, igxile ekuthuthukiseni uhlelo lokuxhumana oluphuthumayo lokuthunyelwa ngokushesha.Ngokusekelwe ku-14years yobuchwepheshe obuqoqiwe kanye nolwazi, sihola ukwenziwa kwasendaweni ngokuthembeka kwemishini enekhono eliqinile le-NLOS, ibanga elide kakhulu nokusebenza okuzinzile ku-UAV, amarobhothi, imakethe yokuxhumana engenantambo yezimoto.
Imikhiqizo Ehlobene Isincomo
Isikhathi sokuthumela: Apr-20-2023
