Dab tsi yog direct sequence spread spectrum technology?
Dab tsi yog direct sequence spread spectrum technology?

Video: Dab tsi yog direct sequence spread spectrum technology?

Video: Dab tsi yog direct sequence spread spectrum technology?
Video: Yog ntuj tsis pab ntshe kuv tuag lawm 8/6/2018 2024, Kaum ib hlis
Anonim

Direct Sequence Spread Spectrum ( DSSS ) yog a Cov txheej txheem nthuav dav spectrum whereby tus thawj cov ntaub ntawv teeb liab yog multiplied nrog ib tug pseudo random suab nrov kis code. Qhov kev sib kis no muaj tus nqi nti ntau dua (qhov no tus nqi ntawm tus lej), uas ua rau lub sij hawm dav dav txuas ntxiv scrambled teeb liab.

Ntxiv mus, Direct Sequence Spread Spectrum Technology Nws ua haujlwm li cas hauv CDMA thev naus laus zis?

Txoj kev ua haujlwm hauv CDMA yog lub npe hu ua direct sequence kis spectrum . Hauv ncaj qha ua ntu zus , cov ntaub ntawv digital yog modulated los ntawm tus nqi ntau dua ib ntus Kev lees paub rau lub dav hlau PN data Txhua qhov me me ntawm PN ib ntus yog "chip", thiab tus nqi siab dua yog hu ua tus nqi nti.

Tsis tas li ntawd, FHSS thiab DSSS yog dab tsi? Ob txoj kev nrov rau kev siv cov spectrum yog zaus-hopping kis spectrum ( FHSS ) thiab direct-sequence kis spectrum ( DSSS ). DSSS , nyob rau hauv sib piv, kis lub teeb liab hla ib tug dav bandwidth tshaj FHSS , tsim kom muaj lub zog qis dua thoob plaws lub spectrum.

Ib yam li ntawd, koj tuaj yeem nug, dab tsi yog qhov kev sib kis spectrum technology?

Tshaj tawm Spectrum . Kis mus - spectrum (SS) tshuab siv lub suab nrov nrov zoo li lub teeb liab rau kis mus qhov ib txwm nqaim cov ntaub ntawv teeb liab hla ib qhov dav dav ntawm xov tooj cua frequencies. Lub receiver sib txuas cov cim tau txais los muab cov ntaub ntawv qub teeb liab.

DSSS teeb liab tsim li cas?

DSSS siv a teeb liab qauv nyob rau hauv uas cov kab mob sib kis ua los ntawm lub transmitter twb paub los ntawm receiver. Tus txais tuaj yeem siv tib qhov kev sib kis sib kis los tawm tsam nws cov txiaj ntsig ntawm qhov tau txais teeb liab nyob rau hauv thiaj li yuav reconstruct cov ntaub ntawv teeb liab.

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