Abstract: Iri blog rinonyanya kusuma maitiro ekushandisa uye zvakanakira zveCOFDM tekinoroji mukufambiswa zvisina waya, uye nzvimbo dzekushandisa tekinoroji.
Keywords: isiri-mutsara-yekuona;Anti-kupindira;Famba nekumhanya kukuru;COFDM
1. Ndeapi akajairika mawaya ekufambisa matekinoroji?
Iyo tekinoroji inoshandiswa mukufambisa isina waya inogona kukamurwa kuita analog transmission, data transmission / Internet radio, GSM / GPRS CDMA, digital microwave (inonyanya kupararira spectrum microwave), WLAN (wireless network), COFDM (orthogonal frequency division multiplexing), nezvimwe. Pakati pavo, matekinoroji echinyakare haagone kuwana Broadband high-speed transmission pasi pe "yakavharwa, isingaonekwi uye yakakwirira-kumhanya nharembozha", nekuvandudzwa uye kukura kweOFDM tekinoroji, dambudziko iri rine mhinduro.
2. Chii chinonzi COFDM tekinoroji?
COFDM (coded orthogonal frequency division multiplexing), kureva, coding orthogonal frequency division multiplexing, mukuwedzera kune ine simba coding kukanganisa kururamisa basa, chikuru ficha ndeye-multi-carrier modulation, inokamura chiteshi chakapihwa mumazhinji orthogonal sub-channel mune frequency domain, inoshandisa imwechete subcarrier pane imwe neimwe chiteshi, uye inoodza rwizi rwedata kuita akati wandei-dhata nzizi, ichiodza iyo data flow rate, idzi sub-data hova dzinobva dzashandiswa kugadzirisa imwe neimwe subcarrier zvakasiyana.
The parallel transmission of each subcarrier inoderedza kutsamira pane imwe chete inotakura, uye yayo anti-multipath kupera simba, anti-intercode interference (ISI) kugona, uye Doppler frequency shift shift resistance inovandudzwa zvakanyanya.
Iko kushandiswa kweCOFDM tekinoroji kunogona kunyatsoona Broadband yakakwirira-kumhanya kutapurirana pasi pechivharo, chisingaonekwe uye chinomhanya-mhanya mamiriro enharembozha, inova ndiyo yakanyanya kukwirisa uye inovimbisa modulation tekinoroji munyika.
3. Ndezvipi zvakanakira COFDM tekinoroji muwireless kutapurirana?
Wireless transmission inopfuura nematanho maviri: analogi uye dhijitari kutapurirana.Analog image transmission yakabviswa mumaindasitiri mazhinji nekuda kwekukanganisa kwayo uye co-channel kupindira uye ruzha rwepamusoro, zvichikonzera kusashanda zvakanaka mukushandisa.
Nekukura kweOFDM tekinoroji uye zvikamu, zvigadzirwa zvinoshandisa COFDM tekinoroji zvave zvakanyanya zvemberi zvisina waya zvekutapurirana michina.Zvayakanakira ndezvizvi:
1, Yakakodzera kushandiswa muNone-line-of-sight uye yakavharidzirwa nharaunda senge nzvimbo dzemadhorobha, masabhabhu, uye zvivakwa, uye inoratidza yakanakisa "diffraction uye kupinda" kugona.
COFDM isina waya yemifananidzo midziyo ine zvakanakira "isina-mutsara-ye-kuona" uye "diffraction" kutapurirana nekuda kweiyo yakawanda-inotakura uye humwe hunyanzvi hunhu，Mumadhorobha, makomo, mukati nekunze zvivakwa uye dzimwe nharaunda dzisingaonekwe. uye yakavharidzirwa, chigadziro chinogona kuwana kugadzikana kwakagadzikana kwemifananidzo ine mukana wepamusoro, uye haisi kukanganiswa nemhoteredzo kana kusakanganiswa nemamiriro ezvinhu.
Omnidirectional antennas anowanzo shandiswa kumagumo ese eiyo transceiver uye inogamuchira, uye iyo sisitimu yekuendesa iri nyore, yakavimbika, uye inochinjika.
2, Yakakodzera kumhanyisa nharembozha, uye inogona kuiswa kumotokari, ngarava, zvikopokopo / drones uye mamwe mapuratifomu.
Traditional microwave, isina waya LAN uye zvimwe zvishandiso hazvigone zvakazvimiririra kuona nharembozha ye transceiver yekupedzisira uye inogona kungoona kuendesa nharembozha kunzvimbo yakagadziriswa pasi pemamwe mamiriro.Yayo sisitimu ine akawanda ehunyanzvi zvinongedzo, yakaoma engineering, yakaderedzwa kuvimbika, uye yakanyanya kudhura.
Nekudaro, yeCOFDM midziyo, haidi chero mimwe michina, inogona kuona kushandiswa kweyakagadziriswa-mobile, nhare-mbozha makamuri, uye yakakodzera kwazvo kuisirwa pamapuratifomu enhare semota, ngarava, zvikopokopo/ drones, nezvimwe. Iko kutapurirana kune kuvimbika kwepamusoro uye kushanda kwepamusoro-soro.
3, Yakakodzera kumhanyisa data data, kazhinji yakakura kupfuura 4Mbps, kusangana nekutapurirana kwemhando yepamusoro vhidhiyo uye odhiyo.
Pamusoro pezvinodiwa kumakamera, vhidhiyo yemhando yepamusoro uye odhiyo zvine zvakakwirira kwazvo zvinodikanwa zveencoding hova uye chiteshi mareti, uye imwe neimwe subcarrier yeCOFDM tekinoroji inogona kusarudza QPSK, 16QAM, 64QAM uye kumwe kumhanyisa-kumhanya modulation, uye synthesized chiteshi chiyero. kazhinji yakakura kupfuura 4Mbps.Nokudaro, inogona kutumira 4: 2: 0, 4: 2: 2 nemamwe macodecs epamusoro muMPEG2, uye kugadziriswa kwemufananidzo wekuguma kwekugamuchira kunogona kusvika ku1080P, iyo inosangana nezvinodiwa zvemashure ekuongorora, kuchengetedza, kugadzirisa uye. zvichingodaro.
4, Munzvimbo dzakaomarara dzemagetsi, COFDM ine yakanakisa kusadzivirirwa kwekukanganisa.
Mune imwe-inotakura sisitimu, kudzima kamwe chete kana kupindira kunogona kuita kuti iyo yese yekutaurirana link ikundikane, asi mune yakawanda yeCOFDM system, chikamu chidiki chete chevatakuridzi chinopindirwa, uye ma subchannels aya anogona zvakare kugadziriswa nekukanganisa-kugadzirisa macode. kuve nechokwadi chekushomeka kwechikanganiso chekutapurirana.
5, Kushandiswa kwechiteshi kwakakwira.
Izvi zvinonyanya kukosha munzvimbo dzisina waya dzine zvishoma zviwanikwa zviwanikwa, uko spectrum kushandiswa kwehurongwa kunowanzoita 2Baud/Hz kana huwandu hwevatakuri hwakakura.
Isa tekinoroji yeCOFDM kune IWAVE's isina waya vhidhiyo transmitter
Parizvino COFDM inoshandiswa zvakanyanya muDVB (Digital Video Broadcasting), DVB-T, DVB-S, DVB-C nezvimwe.
Nekuvandudza tekinoroji, kune akawanda uye akawanda drones uye UAV inoshandira vanhu vari mupurojekiti yakasiyana.IWAVE inotarisa pakugadzira, kusimudzira, uye kutengesa isina waya yekutaurirana mhinduro dzekutengesa drones uye marobhoti.
Mhinduro idzi 800Mhz, 1.4Ghz, 2.3Ghz, 2.4Ghz uye 2.5Ghz, 5km-8km, 10-16km uye 20-50km vhidhiyo uye digital Bi-directional Serial Data Links ine COFDM tekinoroji.
Iyo yepamusoro yekubhururuka inomhanyisa system yedu rutsigiro i400km/h.Munguva yekumhanya kwakadai sisitimu inogona zvakare kuve nechokwadi cheiyo vhidhiyo chiratidzo yakagadzikana kutapurirana.
Kwenguva pfupi 5-8km, OFDM inoshandiswa kuUAV/FPV kana Multi rotor vhidhiyo kutapurirana kwevhidhiyo, Ethernet chiratidzo uye serial data senge.FIP-2405uyeFIM-2405.
Kwehurefu hurefu 20-50km, isu tinokurudzira iyi yakatevedzana zvigadzirwa sengeFIM2450uyeFIP2420
IWAVE's inotora tekinoroji yepamusoro yeCOFDM kune zvigadzirwa zvedu, yakatarisana nekugadzira iyo yekukurumidza kuendesa emergency emergency system.Zvichienderana ne14years yeakaunganidzwa tekinoroji uye zviitiko, isu tinotungamira nharaunda kuburikidza nekuvimbika kwemidziyo ine simba rakasimba reNLOS, yakareba kureba uye yakagadzikana kushanda kushanda muUAV, marobhoti, mota dzisina waya yekutaurirana musika.
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Nguva yekutumira: Kubvumbi-20-2023
