EVM: gajarta na Kuskuren Vector Magnitude, wanda ke nufin girman girman kuskure.
Mitar mitar sigina na dijital shine don daidaita siginar tushe a ƙarshen aikawa, aika shi zuwa layin don watsawa, sannan kuma rage shi a ƙarshen karɓar don dawo da siginar tushe na asali.A cikin wannan tsari, kuskuren daidaitawa da mai daidaitawa ya samar, ingancin na'urorin RF, hayaniyar kulle-kulle (PLL), tasirin murdiya na PA, amo mai zafi, da ƙirar ƙirar ƙirar duk za su haifar da ɓarna na kuskure (EVM).EVM za ta yi tasiri sosai kan ingancin siginar da aka daidaita, don haka aikin gwajin ingancin daidaitawa yana ɗaya daga cikin mahimman abubuwan gwajin RF.
EVM musamman yana nufin kusanci tsakanin ɓangaren IQ da aka samar lokacin da mai watsawa ya lalata siginar da ingantaccen ɓangaren sigina.Yana nuna ingancin siginar da aka daidaita.Yawancin lokaci, kuskuren vector yana da alaƙa da tsare-tsaren daidaitawa na M-ary I/Q kamar QPSK, kuma yawanci ana nuna shi ta zanen I/Q “tauraro” na alamomin lalata.
An bayyana girman girman kuskuren kuskure [EVM] a matsayin rabon tushen ma'anar murabba'in ƙimar matsakaicin ƙarfin siginar kuskure zuwa tushen ma'anar ƙimar murabba'in matsakaicin ikon siginar manufa kuma an bayyana shi azaman kashi.Karamin EVM, mafi kyawun ingancin siginar.
Matsakaicin girman kuskuren vector shine karkata tsakanin ma'aunin ma'aunin igiyar igiyar ruwa da tsarin ka'idar da aka daidaita.Duk nau'ikan raƙuman ruwa suna da bandwidth na 1.28 MHz da juzu'in juzu'i na 0.22.Ana ƙara daidaita nau'ikan igiyoyin igiyoyin ruwa guda biyu ta zaɓar mitar, cikakken lokaci, cikakken girman girma, da lokacin agogon guntu don rage girman kuskuren kuskure.Tazarar awo shine ramin lokaci ɗaya.Matsakaicin girman girman kuskuren kuskuren kada ya wuce 17.5%.
Makasudin gwajin shine don ganin ko siginar igiyar ruwa da mai watsawa ya yi daidai ne don mai karɓa ya sami aikin liyafar da aka ayyana.
Wannan gabatarwa ce ga EVM daga Shenzhen HDV Optoelectronic Technology Co., Ltd., kamfanin sadarwa na gani wanda ke kera samfuran sadarwa.Barka da zuwatuntuba