I-EVM: isifinyezo se-Error Vector Magnitude, okusho ubukhulu be-vector yephutha.
Ukudluliselwa kwebhendi yesignali yedijithali ukulungisa isiginali ye-baseband ekugcineni kokuthumela, ukuyithumela emugqeni ukuze idluliselwe, bese uyehlisa ekugcineni kokwamukela ukuze kubuyiselwe isiginali ye-baseband yangempela. Kule nqubo, iphutha lokuguquguquka elikhiqizwe imodulator, ikhwalithi yamadivayisi e-RF, umsindo we-loop evaliwe (PLL), umphumela wokuhlanekezela we-PA, umsindo oshisayo, nomklamo wemoduli konke kuzokhiqiza ama-vector amaphutha (EVM). I-EVM izoba nomthelela omkhulu kukhwalithi yamasiginali ashintshiwe, ngakho-ke iphrojekthi yokuhlola ikhwalithi yokushintshashintsha ingenye yezingxenye ezibalulekile zokuhlolwa kwe-RF.
I-EVM isho ngokuqondile ukusondelana phakathi kwengxenye ye-IQ ekhiqizwa lapho isidlulisi sehlisa isiginali kanye nengxenye yesignali efanelekile. Kuyinkomba yekhwalithi yesiginali eshintshiwe. Ezikhathini eziningi, i-vector yephutha ihlobene nezikimu zokuguquguquka kwe-M-ary I/Q njenge-QPSK, futhi ivamise ukuboniswa umdwebo "wenkanyezi" we-I/Q wezimpawu zokudilizwa.
I-amplitude ye-Vector yephutha [EVM] ichazwa njengesilinganiso senani eliyisikwele lempande lesilinganiso samandla esignali ye-Vector yephutha kumsuka wevector yenani eliyisikwele lamandla amaphakathi esignali efanelekile futhi ivezwa njengephesenti. I-EVM encane, ingcono ikhwalithi yesiginali.
I-amplitude ye-vector yephutha ukuchezuka phakathi kwe-waveform elinganisiwe kanye ne-waveform eshintshiwe ngokomqondo. Womabili amagagasi anomkhawulokudonsa ongu-1.28 MHz kanye ne-roll-off coefficient engu-0.22. Amagagasi amabili aphinde ahlelwe kabusha ngokukhetha imvamisa, isigaba esiphelele, i-amplitude ephelele, nesikhathi sewashi le-chip ukuze kuncishiswe i-vector yephutha. Isikhawu sokulinganisa siyindawo yesikhathi esisodwa. Ubuncane be-vector yephutha akumele bube bukhulu kuno-17.5%.
Inhloso yokuhlolwa ukubona ukuthi i-waveform eyenziwe ngumthumeli inembe ngokwanele ukuze umamukeli athole ukusebenza kokwamukela okwakushiwo.
Lesi yisingeniso se-EVM esivela kwa-Shenzhen HDV Optoelectronic Technology Co., Ltd., inkampani yokuxhumana yamehlo eyenza imikhiqizo yokuxhumana. Siyakwamukela kubonisana