Blog

Hauv kev sib txuas lus digital, qhov uas tus neeg txais tau txais yog qhov sib npaug ntawm cov teeb liab xa mus thiab cov suab nrov channel. Kev txais tos zoo tshaj plaws ntawm cov teeb liab digital yog nyob ntawm qhov ua yuam kev tsawg kawg nkaus raws li qhov "zoo tshaj plaws". Qhov yuam kev hauv tshooj no yog mai...

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 qhov kev ntseeg tau thiab kev ua haujlwm ntawm qhov system, th ...

Thaum lub peev xwm kis tau tus mob ntawm lub cev channel siab dua qhov kev thov rau 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 fiber ntau. Multiplexing yog ib qho cuab yeej siv los daws qhov t...

(1) AMI code AMI (Alternative Mark Inversion) code yog lub npe tag nrho ntawm cov cim cim inversion code, nws txoj cai encoding yog hloov pauv cov lus code "1" (kos) rau "+1" thiab "-1", thaum qhov "0" (dawb kos npe) tseem tsis hloov. Piv txwv li...

Thaum peb xa cov teeb liab, txawm tias nws yog lub teeb liab kho qhov muag lossis lub teeb liab hluav taws xob lossis lub teeb liab wireless, yog tias nws raug xa mus ncaj qha, lub teeb liab raug cuam tshuam rau lub suab nrov, thiab nws nyuaj rau kom tau txais cov ntaub ntawv raug ntawm qhov kawg tau txais. In order t...

Txoj hauv kev yooj yim ntawm binary digital modulation yog: binary amplitude keying (2ASK) - amplitude hloov ntawm lub teeb liab nqa; Binary zaus hloov pauv keying (2FSK) - qhov hloov pauv zaus ntawm cov teeb liab thauj khoom; Binary theem hloov keying (2PSK)- Theem hloov ntawm cov cab kuj si...