Daim duab 6-6 yog ib daim duab thaiv ntawm ib qho kev siv digital baseband teeb liab kis tau tus mob. Nws yog tsim los ntawm kev lim dej (channel teeb liab generator), channel, txais tos lim, thiab tus qauv txiav txim siab. Txhawm rau kom ntseeg tau tias kev ua haujlwm ruaj khov thiab kev ua haujlwm ntawm qhov system, kuj yuav tsum muaj qhov system synchronization.
Cov haujlwm ntawm txhua qhov thaiv hauv daim duab thiab cov txheej txheem ntawm lub cev ntawm cov teeb liab kis tau raug piav qhia luv luv raws li hauv qab no:
(1) Lub teeb liab channel qub (hloov lim). Nws txoj haujlwm yog los tsim kom muaj lub teeb liab baseband waveform haum rau kev sib kis ntawm cov channel. Vim tias nws cov tswv yim feem ntau yog tus lej sib kis tau tsim los ntawm tus lej hom encoder, qhov sib piv cov qauv waveform feem ntau yog cov duab plaub, thiab nws cov spectrum yog dav heev, uas tsis zoo rau kev sib kis. Cov lim kis tau tus mob yog siv los ua kom cov ntaub ntawv tawm suab paj nruag thiab hloov cov lej sib kis mus rau hauv lub teeb liab baseband waveform haum rau kev sib kis.
(2) Channel. Nws yog ib qho nruab nrab uas tso cai rau cov teeb liab baseband dhau los, feem ntau yog ib txoj kab sib txuas, xws li ib khub twisted, coaxial cable, thiab lwm yam. Cov yam ntxwv ntawm kev sib kis ntawm cov channel feem ntau tsis ua raws li qhov tsis muaj kev sib kis tsis zoo, yog li qhov sib kis waveform yuav yuav distorted. Tsis tas li ntawd, suab nrov n (T) tau nkag mus rau hauv cov channel, thiab nws tau xav tias nws yog Gaussian dawb suab nrov nrog tus nqi nruab nrab ntawm xoom.
(3) Lub lim dej txais tos Nws yog siv los txais cov teeb liab, lim tawm cov suab nrov channel thiab lwm yam cuam tshuam ntau li ntau tau, sib npaug cov yam ntxwv ntawm cov channel, thiab ua rau cov khoom tso tawm baseband waveform tsim nyog rau kev txiav txim siab sampling.
(4) Tus qauv xaiv. Nws yog los ua piv txwv thiab txiav txim siab qhov tso zis waveform ntawm qhov tau txais lim dej ntawm lub sijhawm predetermined (tswj los ntawm lub sij hawm me ntsis mem tes) thiaj li yuav rov qab los yog rov tsim dua cov teeb liab baseband nyob rau hauv keeb kwm yav dhau ntawm cov yam ntxwv tsis zoo ntawm kev sib kis thiab suab nrov.
(5) Pulse lub sij hawm thiab synchronous extraction me ntsis sij hawm mem tes siv rau sampling yog muab rho tawm los ntawm lub teeb liab tau txais los ntawm lub synchronous extraction circuit. Qhov tseeb ntawm lub sijhawm me ntsis yuav cuam tshuam ncaj qha rau qhov kev txiav txim siab.
Qhov no yog cov muaj pes tsawg leeg ntawm cov teeb liab baseband kis tau tus mob coj los ntawm Shenzhen HDV Phoelectron Technology Co., Ltd. Kuv vam tias tsab xov xwm no tuaj yeem pab koj nce koj txoj kev paub. Dhau li ntawm tsab xov xwm no yog tias koj tab tom nrhiav rau lub tuam txhab kev sib txuas lus zoo fiber ntau cov khoom lag luam koj tuaj yeem xav txogtxog peb.
Shenzhen HDV photoelectric Technology Co., Ltd. yog lub chaw tsim khoom ntawm cov khoom sib txuas lus. Tam sim no, cov cuab yeej tsim tawm npog covONU series, Optical module series, OLT series, thiabtransceiver series. Peb tuaj yeem muab cov kev pabcuam customized rau cov xwm txheej sib txawv. Zoo siab txais tossab laj.
