Kev paub

Hauv kev sib txuas lus digital, tus txais tau txais cov lej ntawm cov teeb liab kis tau tus mob thiab cov suab nrov channel. Kev txais tos zoo tshaj plaws ntawm cov teeb liab digital raws li "zoo tshaj" cov qauv nrog qhov ua yuam kev tsawg tshaj plaws. Qhov yuam kev uas tau txiav txim siab hauv tshooj no yog vim muaj kev txwv band-limited ...

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 xov lim (channel teeb liab generator), channel, txais tos lim, thiab tus qauv txiav txim siab. Txhawm rau kom ntseeg tau tias muaj kev ntseeg siab thiab ua haujlwm tau zoo o ...

Lub teeb liab digital baseband yog hluav taws xob waveform uas sawv cev rau cov ntaub ntawv digital, uas tuaj yeem sawv cev los ntawm ntau qib lossis pulses. Muaj ntau hom digital baseband signals (tom qab no hu ua baseband signals). Daim duab 6-1 qhia ob peb lub hauv paus teeb liab waveforms, ...

Kev lees paub cov cim tuaj yeem muab faib ua cov cim hluav taws xob thiab lub zog hluav taws xob raws li lawv lub zog. Cov teeb liab fais fab tuaj yeem muab faib ua cov cim ntu ntu thiab cov cim aperiodic raws li seb lawv puas yog lub sijhawm lossis tsis yog. Lub zog teeb liab yog qhov kawg hauv amplitude thiab lub sijhawm, nws lub zog yog fi ...

Thaum lub peev xwm kis tau tus mob ntawm lub cev channel siab dua qhov kev thov ntawm ib lub teeb liab, cov channel tuaj yeem sib koom los ntawm ntau lub teeb liab. Piv txwv li, cov kab hauv lub cev ntawm lub xov tooj feem ntau muaj ntau txhiab lub teeb liab kis tau los ntawm ib qho khoom siv kho qhov muag. Multiplexing yog cov cuab yeej technology uas sol ...

1) AMI code Lub npe tag nrho ntawm AMI (Alternative Mark Inversion) code yog tus lej cim hloov pauv. blank) nyob twj ywm tsis hloov. Piv txwv li: Message code: 0 1 1 0 0 0 0 0 0 0 1 1 0 0 1 1… AMI code: 0 -1 +1 0 0 0 0 0 0 0 -1 +1 0 0 -1 +1… The waveform Raws li AMI code yog ...