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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 ...

Thaum peb xa cov teeb liab, txawm tias nws yog lub teeb liab kho qhov muag, lub teeb liab hluav taws xob, lossis lub teeb liab wireless, yog tias nws raug xa ncaj qha, lub teeb liab tau yooj yim cuam tshuam los ntawm lub suab nrov, thiab nws nyuaj rau kom tau txais cov ntaub ntawv raug thaum kawg tau txais. Txhawm rau txhim kho kev tiv thaiv kev cuam tshuam abilit ...

Cov qauv yooj yim ntawm binary digital modulation yog: Binary amplitude keying (2ASK) - amplitude hloov ntawm lub teeb liab nqa; Binary zaus hloov keying (2FSK) - zaus hloov ntawm cov teeb liab nqa; Binary theem hloov pauv keying (2PSK)-theem hloov ntawm cov teeb liab cov cab kuj. Differential theem hloov keyin...