I-EVM: isifinyezo soBukhulu beVektha yeMposiso, nto leyo ethetha imposiso ye-amplitude yevektha.
Ukuhanjiswa kwebhendi yesiginali yedijithali kukumodareyitha isiginali ye-baseband ekupheleni kokuthumela, ukuyithumela kumgca wokuhanjiswa, kwaye emva koko uyithobe ekupheleni kokufumana ukubuyisela isiginali yesiseko.Kule nkqubo, impazamo yokumodareyitha eveliswe yimodyuli, umgangatho wezixhobo zeRF, ingxolo ye-loop (PLL) evaliweyo, isiphumo sokuphazamiseka kwe-PA, ingxolo ye-thermal, kunye noyilo lwemodyuli luya kuvelisa zonke ii-vectors zempazamo (EVM).I-EVM iya kuba nefuthe elikhulu kumgangatho weempawu ezimodyiweyo, ngoko ke iprojekthi yovavanyo lomgangatho wohlengahlengiso yenye yezinto ezibalulekileyo zovavanyo lweRF.
I-EVM ibhekisa ngokuthe ngqo ekusondeleni phakathi kwecandelo le-IQ elenziwe xa i-transmitter ithomalalisa umqondiso kunye necandelo lophawu olufanelekileyo.Sisalathisi somgangatho wesiginali emoduliweyo.Ngamaxesha amaninzi, i-vector ye-error inento yokwenza ne-M-ary I / Q izikimu zokumodareyitha ezifana ne-QPSK, kwaye ngokuqhelekileyo iboniswa yi-I / Q "yinkwenkwezi" yedayagram yeesimboli zokuchithwa.
Imposiso ye-amplitude yevektha [EVM] ichazwa njengomlinganiselo wengcambu yentsingiselo yexabiso elisisikweri somlinganiselo wamandla ophawu lwempazamo ukuya kwingcambu yexabiso elisisikweri somlinganiselo wamandla ophawu olufanelekileyo kwaye ichazwa njengepesenti.Incinci i-EVM, ingcono umgangatho wesignali.
Imposiso ye-amplitude yevektha kukutenxa phakathi komlinganiselo wamaza omaza kunye nemo yethiyori emodareyithiweyo.Zombini iifom zamaza zine-bandwidth ye-1.28 MHz kunye ne-roll-off coefficient ye-0.22.Iiforms ezimbini zimodareyithwa ngakumbi ngokukhetha frequency, isigaba esipheleleyo, i-amplitude epheleleyo, kunye nexesha lewotshi ye-chip ukunciphisa i-vector yempazamo.Isithuba somlinganiselo sisithuba sexesha elinye.Ubuncinane be-vector amplitude yempazamo mayingabi ngaphezu kwe-17.5%.
Injongo yovavanyo kukubona ukuba i-waveform eyenziwe yi-transmitter ichanekile ngokwaneleyo ukuba umamkeli afumane ukusebenza kolwamkelo oluchaziweyo.
Esi sisingeniso kwi-EVM evela e-Shenzhen HDV Optoelectronic Technology Co., Ltd., inkampani yonxibelelwano lwe-optical eyenza iimveliso zonxibelelwano.Wamkelekile kwibonisana