EVM: mbiri nke Error Vector Magnitude, nke pụtara njupụta vector njehie.
Mgbasa ozi ọnụọgụ ọnụọgụ dijitalụ bụ iji gbanwee akara ngosi baseband na njedebe izipu, ziga ya na ahịrị maka nnyefe, wee megharịa ya na njedebe nnata iji nwetaghachi akara ngosi baseband mbụ.N'ime usoro a, njehie modulation nke modulator na-emepụta, àgwà nke ngwaọrụ RF, mkpọtụ-kpọchiri akpọchi (PLL), mmetụta PA distortion, mkpọtụ ọkụ, na imewe modulator ga-emepụta ihe niile bụ vectors njehie (EVM).EVM ga-enwe mmetụta dị ukwuu n'ịdị mma nke akara ngosi, ya mere, ọrụ nyocha nke modulation bụ otu n'ime akụkụ dị mkpa nke nyocha RF.
EVM na-ezo aka na nso nso dị n'etiti akụrụngwa IQ emepụtara mgbe onye na-ebugharị na-eme ka mgbama na akụkụ mgbama dị mma.Ọ bụ ihe na-egosi ogo mgbama a gbanwetụrụ.Ọtụtụ mgbe, vector njehie nwere ihe jikọrọ ya na atụmatụ mgbanwe M-ary I/Q dị ka QPSK, a na-egosipụtakarịkwa ya site na eserese I/Q “kpakpando” nke akara demodulation.
A kọwapụtara njupụta vector njehie [EVM] dị ka nha nke mgbọrọgwụ pụtara uru square nke nkezi ike nke mgbama vector njehie na mgbọrọgwụ pụtara uru square nke nkezi ike nke ezigbo mgbaama ma gosipụta ya dị ka pasent.Ka EVM dị ntakịrị, ka mma mgbaàmà ka mma.
Mpempe vector mperi mperi bụ ngbanwe dị n'etiti ụdị ebili mmiri tụrụ na usoro ebili mmiri emegharịziri.Ụdị ebili mmiri abụọ a nwere bandwit nke 1.28 MHz yana ọnụọgụ mpịakọta nke 0.22.A na-emezigharị ụdị ebili mmiri abụọ a site n'ịhọrọ ugboro ole, oge zuru oke, njupụta zuru oke, na oge elekere mgbawa iji belata vector njehie.Ogologo oge nha bụ oghere otu oge.Opekempe mpe mpe mpe mpe akwa vector agaghị agafe 17.5%.
Ebumnuche nke ule a bụ ịhụ ma ọ bụrụ na ebili mmiri nke onye na-ebufe mere ziri ezi maka onye nnata iji nweta arụmọrụ nnabata nke akọwapụtara.
Nke a bụ mmeghe nke EVM sitere na Shenzhen HDV Optoelectronic Technology Co., Ltd., ụlọ ọrụ nkwurịta okwu anya nke na-emepụta ngwaahịa nkwurịta okwu.Nnọọ nandụmọdụ