Microwave kis tau tus mob Microwave kis tau tus mob yog txoj kev tseem ceeb ntawm wireless kis tau tus mob. Hauv kev saib xyuas cov duab xa mus, nws tau muab faib ua: analog microwave kis tau tus mob thiab digital microwave kis tau tus mob, uas tau qhia raws li hauv qab no:
1. Analog microwave: Feem ntau muaj peb zaus bands hauv kev ua haujlwm zaus, xws li L-band, S-band thiab Ku-band. Feem ntau, L-band thiab S-band tuaj yeem siv rau hauv qhov chaw uas muaj kev cuam tshuam me me. Tus nqi qis dua, thiab kev cuam tshuam dav dav yog qhov hnyav dua, lossis ib puag ncig qhov nyuaj dua yuav tsum raug xa mus rau hauv KU band. Nws yog ib qho tsim nyog los xyuas kom meej tias ob lub ntsiab lus ntawm qhov chaw pom, thiab kev xa tawm video thiab suab ntawm lub koob yees duab soj ntsuam yog nqa tawm taw tes rau-taw tes. Nws tsis tuaj yeem siv nyob rau hauv kev cuam tshuam. Yog tias nws raug thaiv, ultrashort yoj yuav tsum tau siv. Txawm hais tias nws muaj qee qhov kev muaj peev xwm diffraction, qhov kev sib kis deb yog luv heev, thiab tus nqi siab. Kev sib kis ntawm lub microwave analog tau txais cov qauv analog zaus hloov kho, uas cuam tshuam los ntawm ib puag ncig thiab kev nyab xeeb. Yog tias xav tau kev tswj hwm, lub wireless hais kom ua tswj yuav tsum tau ntxiv. Lub kaw lus video thiab cov lus txib sib cais. Ob txoj kev ywj pheej. Yog tias muaj qee qhov kev soj ntsuam xyuas cov ntsiab lus thiab qhov kev sib kis tau ntev, koj tuaj yeem xav txog kev siv nws, tab sis koj yuav tsum xaiv qhov tsim nyog zaus raws li qhov chaw nyob, thiaj li ua kom cov duab ruaj khov. Feem ntau, cov analog microwave yuav tsum tau nruab nrog kev tiv thaiv xob laim thiab dej tsis zoo, txwv tsis pub lub kaw lus yuav tsis ua haujlwm ruaj khov. Qhov zoo ntawm analog microwave: kev tsim kho yooj yim, kev teeb tsa yooj yim, kev sib kis mus ntev. Qhov tsis zoo ntawm analog microwave: debugging yog teeb meem, cuam tshuam los ntawm ib puag ncig thiab kev nyab xeeb, tsis tuaj yeem xa ntau lub teeb liab nyob rau tib lub sijhawm, thiab nws yooj yim los ntawm xob laim.
2. Digital microwave feem ntau yog tsim los ntawm: wireless network choj koom tes nrog codec (video server) kom paub txog kev xa duab mus ntev. Feem ntau, point-to-point network tau paub los ntawm kev sib txuas network, thiab cov duab analog video tau hloov mus rau hauv network teeb liab los ntawm tus encoder. , Thiab tom qab ntawd xa cov teeb liab hauv lub network los ntawm tus choj txuas wireless, thiab rov qab kho lub network teeb liab mus rau lub teeb liab analog video los ntawm tus decoder (nyuaj decoding lossis soft decoding) nyob rau tom qab kawg, uas tuaj yeem xa cov video, suab, cov ntaub ntawv, thiab cov duab xa mus. tib lub sij hawm Tus naj npawb ntawm cov channel thiab cov duab zoo nyob ntawm qhov bandwidth ntawm lub network. Qhov zoo ntawm cov microwave digital: nws tsis tshua muaj kev cuam tshuam los ntawm ib puag ncig, txhawb nqa relay, thiab tuaj yeem xa mus rau qhov ntev. Disadvantages ntawm digital microwave: teeb meem debugging, cuam tshuam los ntawm network bandwidth.
3. Cov duab zoo ntawm analog microwave soj ntsuam lub koob yees duab zoo dua li cov digital microwave, tab sis cov analog microwave tau yooj yim cuam tshuam los ntawm ib puag ncig thiab kev nyab xeeb. Txawm hais tias lub microwave digital muaj qhov cuam tshuam me me, kev xa xov hluav taws xob wireless bandwidth raug txwv, thiab nws nyuaj rau xa cov duab ntau. . Txhua tus muaj nws tus yam ntxwv thiab tuaj yeem xaiv los ntawm kev xav txog engineering ib puag ncig.
CDMA network kis tau tus mob, lub domestic CDMA network ceev kuj qeeb, tam sim no tsuas yog ncav cuag 2.5G, nws yog ib qho nyuaj heev rau xa mus rau lub real-time nruam dluab los ntawm cov tam sim no domestic CDMA network, yeej tsuas siv lub network xa cov duab. Yog tias koj xav xa cov duab video hauv lub sijhawm tiag tiag, koj yuav tsum kho cov yeeb yaj kiab kom me me lossis ua kom lub network bandwidth. Nws yuav twv yuav raug hu yog ib tug qauv siv network kis tau tus mob nyob rau hauv lub neej yav tom ntej, vim hais tias tom qab tag nrho, nws npog ib tug dav cheeb tsam thiab tsis txwv los ntawm kev ncua deb.
Satellite kis tau tus mob, satellite kis tau tus mob yog feem ntau satellite positioning system, tseem hu ua GPRS system. Nws kuj tseem cuam tshuam los ntawm bandwidth. Muaj twb tau siv ntau lub satellite positioning systems kom nkag siab txog thaj chaw tshwj xeeb ntawm lub hom phiaj taug qab. Xws li cov nyiaj ntsuab thauj tsheb, kev tso xov tooj ntawm tes thiab lwm yam. Nyob rau hauv lub neej yav tom ntej, yog tias bandwidth tuaj yeem nce ntxiv, nws yuav yooj yim pub rov qab cov duab nyob ntawm nws lub sijhawm, thiab nws yuav muaj ntau yam kev siv.
Cov ntsiab lus
Tsuas yog los ntawm kev nkag siab cov yam ntxwv ntawm ntau yam kev sib kis thiab xaiv txoj kev sib kis uas tsim nyog raws li qhov xwm txheej tiag tiag ntawm qhov project tuaj yeem ua rau koj tus kheej qhov project tsim cov txiaj ntsig zoo.
