Daim duab 6-6 yog ib daim duab thaiv ntawm ib qho kev siv digital baseband teeb liab kis tau tus mob. Nws yog tsuas yog tsim los ntawm kev xa cov lim (channel teeb liab generator), channel, tau txais lim thiab kev txiav txim siab sampling. Txhawm rau kom ntseeg tau tias kev ua haujlwm ruaj khov thiab kev ua haujlwm ntawm qhov system, kuj yuav tsum muaj qhov system synchronous.
Cov haujlwm ntawm txhua lub thawv hauv daim duab thiab cov txheej txheem lub cev ntawm cov teeb liab kis tau raug piav raws li hauv qab no:
(1) Channel teeb liab generator (transmit filter). Nws txoj haujlwm yog los tsim cov teeb liab baseband waveform haum rau kev sib kis ntawm cov channel. Vim hais tias cov tswv yim feem ntau yog kis tau tus lej tsim los ntawm tus lej encoder, qhov sib thooj ntawm 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 tswv yim zaus band thiab hloov cov lej sib kis mus rau hauv cov 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 kom dhau mus, feem ntau yog ib txoj kab sib txuas, xws li twisted khub, coaxial cable, thiab lwm yam. Cov yam ntxwv ntawm cov channel feem ntau tsis ua raws li cov xwm txheej ntawm kev sib kis tsis muaj kev sib kis, yog li nws yuav ua rau muaj kev cuam tshuam. ntawm qhov kis tau tus mob waveform. Tsis tas li ntawd, cov channel qhia lub suab nrov n(t) thiab xav tias nws yog Gaussian dawb suab nrov nrog lub ntsiab lus ntawm xoom.
(3) Tau txais lim. 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 ntawm cov yam ntxwv ntawm cov channel, thiab ua rau cov zis baseband waveform tsim nyog rau kev txiav txim siab sampling.
(4) Kev txiav txim coj mus kuaj. Nyob rau hauv keeb kwm yav dhau ntawm cov yam ntxwv tsis zoo ntawm kev sib kis thiab suab nrov, cov zis waveform ntawm qhov tau txais lim tau coj mus kuaj ntawm lub sijhawm teev tseg (tswj los ntawm lub sijhawm me ntsis pulse) kom rov qab los yog rov tsim cov teeb liab baseband.
(5) Lub sij hawm mem tes thiab synchronous extraction. Lub sijhawm me ntsis mem tes siv rau kev kuaj yog muab rho tawm los ntawm cov teeb liab tau txais los ntawm lub synchronous extraction circuit, thiab qhov tseeb ntawm lub sijhawm me ntsis yuav cuam tshuam ncaj qha rau kev txiav txim siab.
Qhov no yog ShenzhenHDV Phohluav taws xob Technology Ltd. los coj koj txog "Qhov muaj pes tsawg leeg ntawm digital baseband teeb liab kis tau tus mob", vam tias yuav pab tau koj, thiab ShenzhenHDV Phohluav taws xob Technology Ltd ntxiv rauONUseries, transceiver series,OLTseries, tab sis kuj tsim module series, xws li: Kev sib txuas lus kho qhov muag module, optical kev sib txuas lus module, network kho qhov muag module, kev sib txuas lus optical module, optical fiber module, Ethernet optical fiber module, thiab lwm yam., tuaj yeem muab cov kev pabcuam zoo sib xws rau cov neeg siv khoom sib txawv. , txais tos koj tuaj xyuas.
