Cov txheej txheem:
Video: Dab tsi yog qhov tsis zoo ntawm kev faib ntau zaus multiplexing?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Disadvantages ntawm FDM
- Tag nrho cov ntau zaus division multiplexing channel getaffected vim wideband fading.
- Ntau tus modulators thiab lim yuav tsum tau.
- Cov channel kev sib txuas lus yuav tsum muaj ib tug loj bandwidth.
- Cov ntau zaus division multiplexing raug kev txom nyem los ntawm qhov teeb meem ntawm crosstalk.
Tsis tas li ntawd, vim li cas peb thiaj siv ntau zaus division multiplexing?
Qhov twg zaus - division multiplexing yog siv raws li tso cai rau ntau tus neeg siv los qhia txog kev sib txuas lus ntawm lub cev, nws hu ua zaus - kev faib Kev nkag tau ntau yam (FDMA). FDMA yog txoj hauv kev ntawm kev sib cais xov tooj cua ntawm cov khoom sib txawv.
Tsis tas li ntawd, cov ntawv thov ntawm FDM yog dab tsi? Cov FDM system yog siv nyob rau hauv Digital Subscriber Lineor DSL Modems, uas yuav pab tau xa ib tug loj npaum li cas ntawm computerdata rau kev nkag mus rau hauv Internet nyob rau hauv ib tug tib kis kab mob. Nws yog ib qho tseem ceeb heev kev thov ntawm FDM . 6. FDM yog siv nyob rau hauv stereo Frequency Modulation los yog FM transmissionsystem.
Kuj Paub, qhov zoo ntawm FDM yog dab tsi?
Qhov zoo ntawm FDM : FDM tsis xav tau synchronization ntawm nws transmitter thiab receiver rau kev ua haujlwm kom raug. 4. Vim slownarrow band fading tsuas yog ib qho channel tau txais kev cuam tshuam.
Dab tsi yog qhov sib faib zaus multiplexing hauv kev sib tham?
Kev faib tawm ntau zaus ( FDM ) yog a kev sib tham txheej txheem nyob rau hauv uas ntau cov ntaub ntawv teeb liab raug muab sib xyaw rau ib txhij kis tau tus mob los ntawm ib tug sib koom kev sib txuas lus nruab nrab. FDM siv lub teeb liab cab kuj ntawm ib tug discrete zaus rau txhua cov ntaub ntawv kwj thiab tom qab ntawd sib txuas ntau cov teeb liab modulated.
Pom zoo:
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog qee qhov tsis zoo ntawm lub sijhawm stamping txoj hauv kev rau kev tswj hwm kev sib raug zoo?
Qhov tsis zoo ntawm lub sij hawm stamping mus kom ze yog tias txhua tus nqi khaws cia hauv cov ntaub ntawv yuav tsum muaj ob lub sij hawm thwj ntxiv: ib qho rau lub sijhawm kawg ntawm daim teb tau nyeem thiab ib qho rau qhov hloov tshiab kawg. Lub sij hawm stamping yog li ua rau kom nco xav tau thiab cov ntaub ntawv ua haujlwm nyiaj siv ua haujlwm
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev tshaj xov xwm hauv kev kho mob?
Thaum siv ceev faj, kev tshaj xov xwm tuaj yeem muab cov txiaj ntsig zoo xws li kev sib tham ua haujlwm, kev kawm kho mob, thiab cov neeg mob kev noj qab haus huv. Txawm li cas los xij, thaum siv tsis zoo, kev tshaj xov xwm hauv social media muaj qhov tsis zoo xws li kev ua txhaum ntawm cov neeg mob tsis pub leej twg paub thiab tsis pub leej twg paub thiab tuaj yeem ua rau muaj kev cuam tshuam loj heev
Dab tsi yog qhov zoo ntawm kev tshawb fawb zoo tshaj li kev tshawb fawb ntau?
Cov ntaub ntawv los ntawm kev tshawb fawb ntau - xws li kev lag luam loj, pej xeem, thiab cov neeg siv nyiam - muab cov ntaub ntawv tseem ceeb rau kev txiav txim siab ua lag luam. Kev tshawb fawb zoo muab cov ntaub ntawv tseem ceeb rau kev siv hauv kev tsim cov khoom lag luam-nrog rau cov ntaub ntawv hais txog cov neeg siv khoom xav tau, tus qauv coj tus cwj pwm, thiab cov ntaub ntawv siv