He aha te rereketanga o te tohu vector me te puna tohu RF?

Ka taea e te puna tohu te whakarato tohu whakamatautau tika me te tino pumau mo nga momo waahanga me nga tono whakamatautau punaha. Ka taapirihia e te kaihanga tohu he mahi whakarereke tika, ka taea te awhina i te tohu o te punaha me te mahi i nga whakamatautau mahi a te kaiwhiwhi. Ko te tohu vector me te puna tohu RF ka taea te whakamahi hei puna tohu tohu whakamatautau. Kei raro nei o raatau ake ahuatanga kei raro i te tātaritanga.
He aha te rereketanga o te tohu vector me te puna tohu RF?
1. Kupu Whakataki ki te Puna Waitohu Vector
I puta te kaihanga tohu tohu vector i te tekau tau atu i 1980, ka whakamahi i te tikanga whakanekehanga vector auau takawaenga me te tikanga whakawhiti reo irirangi ki raro ki te whakaputa i te tohu huringa vector. Ko te maataapono ko te whakamahi i te waeine whakahiato auau ki te whakaputa i te tohu oscillator rohe ngaruiti rereke tonu me te tohu auau takawaenga. Ko te tohu auau takawaenga me te tohu papaa ka uru ki roto i te kaitahuri vector ki te whakaputa i te tohu tere tere o te waahana takawaenga me te auau kawe mau (ko te auau kawe ko te auau o te tohu auau tohu). tohu. Kei roto i te tohu auau reo irirangi nga korero mo te riipene turanga rite ki te tohu huringa vector auau takawaenga. Ko te tohu RF ka tohua me te whakarereke i te waahanga tohu tohu, ka tukuna ki te tauranga whakaputa mo te whakaputa.

Waehanga Waehanga Waehanga Waehanga Waehanga Waehanga, Waewaewae Waahanga Waitohu, He rite tonu te punaha whakarereke tairitenga me etahi atu waahanga ki te kaihanga tohu noa. Ko te rereketanga i waenga i te kaihanga tohu tohu vector me te kaihanga tohu noa ko te waeine whakarerekētanga vector me te waeine whakaputa tohu tohu turanga.

Pērā i te whakarerekētanga tairitenga, e toru ano nga tikanga taketake o te whakahuringa matihiko, ara te whakanekehanga amplitude, te whakarereketanga o te wahanga me te huringa auau. E wha nga waeine mahi kei roto i te kaitahuri vector: ka huri te oscillator rohe 90 ° wahanga-whakawhiti hiko wehenga hiko i te tohu RF whakauru ki nga tohu RF orthogonal e rua; ka huri nga waeine whakaranu e rua i te tohu-waa-waewae me te tohu tapawha Whakareatia ki te tohu RF e rite ana; ka whakahiatohia e te waeine hiko nga tohu e rua i muri i te whakarea me nga putanga. Ko te tikanga, ko nga tauranga whakauru me nga tauranga whakaputa ka whakamutua a roto me te kawenga 50Ω me te tango i tetahi tikanga taraiwa tohu rereke hei whakaiti i te hokinga mai o te tauranga me te whakapai ake i te mahi a te vector modulator.

Ka whakamahia te waeine whakangao tohu turanga ki te whakaputa i te tohu ira turanga e hiahiatia ana, me te ahua ngaru e whakaratohia ana e te kaiwhakamahi ka taea hoki te tango ki te mahara ngaru hei whakaputa i te whakatakotoranga kua tautuhia e te kaiwhakamahi. I te nuinga o te wa ko te kaihanga tohu papaapapa he pūtukatuka pakaru, he kaihanga raraunga, he kaiwhakaputa tohu, he tātari whakaihiihi mutunga (FIR), he resampler mamati, DAC, me te tātari hanga ano.

2. Whakaaturanga o te puna tohu RF
He maha nga wa ka whakamahia e te hangarau whakahiato auau o naianei he tikanga whakahiato autaki ki te hono i te auau o te puna wiri matua me te auau o te puna auau tohutoro ma roto i te kohanga kua maukati-waa. He iti ake nga taputapu taputapu, he nui te pono, me te whanui whanui. Ko te mea matua ko te waahi kua kati, a ko te puna tohu RF he kaupapa whanui whanui. Ko te tikanga, ko nga puna tohu ka taea te whakaputa tohu RF ka eke ki te puna tohu RF. Ko nga puna tohu tohu vector o naianei kei roto i te roopu RF, no reira ka kiia hoki he puna tohu tohu RF vector.

Tuatoru, ko te rereketanga o nga tohu e rua
1. Ko te puna tohu auau reo irirangi parakore ka whakamahia noa hei whakaputa i nga tohu auau reo irirangi tairitenga kotahi, a, i te nuinga o te waa kaore e whakamahia hei whakaputa i nga tohu kua whakarereketia, ina koa nga tohu kua whakarerekehia. Ko tenei momo puna tohu he whanui ake te roopu auau me te awhe hihiko hiko nui ake.

2. Ko te puna tohu tohu ka whakamahia te nuinga ki te whakaputa i nga tohu vector, ara, ko nga tohu whakarereketanga e whakamahia nuitia ana i roto i te whakawhitiwhiti korero mamati, penei i te l / Q modulation: ASK, FSK, MSK, PSK, QAM, whakaritea I / Q, 3GPPLTE FDD me TDD, 3GPPFDD / HSPA / HSPA +, GSM / EDGE / EDGE whanaketanga, TD-SCDMA, WiMAX? Me etahi atu paerewa. Mo te puna tohu tohu vector, na te mea ka huri te roopu roopu o roto, kaore i te teitei rawa te auau (mo te 6GHz). Ko te taurangi e pa ana ki tana kaiwhakahuri (penei i te bandwidth tohu tohu turanga) me te maha o nga hongere tohu he tohu nui.

Whakakahoretanga: He tuhinga taia ano tenei tuhinga. Ko te kaupapa o tenei tuhinga he tuku korero atu, a, no te kaituhi taketake te mana pupuri. Mena kei roto i nga riipene whakaata, pikitia me nga tuhinga kei roto i tenei tuhinga nga take mana pupuri, tena koa whakapiri atu ki te kaiwhakatika kia pai ai.