Vim li cas sc fdma siv hauv uplink?

Cov txheej txheem:

Vim li cas sc fdma siv hauv uplink?
Vim li cas sc fdma siv hauv uplink?
Anonim

SC-FDMA yog qhov nyiam rau LTE uplink feem ntau yog vim nws qhov kom zoo dua ntawm qhov muaj qhov nruab nrab qis-rau-nruab nrab lub zog piv (PAPR) thaum lub teeb liab kis tau tus mob . … Nws tau pom tias los ntawm kev nce kis tus lej cim qhov yuam kev raug txo rau SC-FDMA system thiab rau kev sib kis ntawm 64 rau SNR=20 dB, SER yog ntawm qhov kev txiav txim ntawm 10 -4.

Vim li cas LTE siv OFDMA rau downlink thiab SC-FDMA rau uplink?

LTE siv OFDM raws li cov qauv teeb liab - OFDMA hauv downlink thiab SC-FDMA hauv uplink nrog ntau hom qauv. … Kev txiav txim siab siab dua yog siv kom ua tiav cov ntaub ntawv siab dua: qhov kev txiav txim siab tau txiav txim siab los ntawm lub teeb liab zoo.

Vim li cas OFDMA tsis siv hauv uplink?

OFDMA yog siv rau ntawm downling, tab sis txij li nws nthuav tawm qhov siab Peak-rau-nruab nrab Lub Hwj Chim tsis tausiv nws ntawm qhov uplink.

lwm lo lus rau LTE uplink SC-FDMA yog dab tsi?

Ib tus neeg nqa khoom FDMA (SC-FDMA) yog qhov sib faib ntau zaus. Nws tseem hu ua linearly precoded OFDMA (LP-OFDMA).

SC-FDMA yog dab tsi hauv LTE?

SC-FDMA yog a hybrid modulation scheme uas sib txuas cov qis peak-rau-nruab nrab piv (PAR) ntawm cov qauv ib leeg-tus neeg nqa khoom xws li GSM nrog ntau qhov kev tiv thaiv thiab nyob rau hauv-channel zaus teem sij hawm hloov tau ntawm orthogonal zaus-division multiplexing (OFDM). Acronyms galore: LTE keeb kwm thiab ntsiab lus.

Pom zoo:

Thaum siv vim li cas thiab yog vim li cas?

Thaum siv vim li cas thiab yog vim li cas?

Vim li cas thiab qhov twg ntawm qee yam yog vim li cas rau nws. Txawm tias cov thawj coj ua tiav yuav tsum tau nug txog vim li cas thiab yog li ntawd ntawm lawv qhov kev ua. Nws tsis txaus siab tham txog vim li cas thiab yog li ntawd nws lub sijhawm nyob txawv teb chaws.

Vim li cas cov khoom siv dielectric siv hauv capacitor?

Vim li cas cov khoom siv dielectric siv hauv capacitor?

Ib qho khoom siv dielectric yog siv los cais cov paib hluav taws xob ntawm lub capacitor. Cov khoom siv insulating no tseem ceeb txiav txim siab txog cov khoom ntawm cov khoom. Lub dielectric qhov tsis tu ncua ntawm cov khoom txiav txim siab npaum li cas ntawm lub zog uas lub capacitor tuaj yeem khaws cia thaum siv hluav taws xob.

Vim li cas cov alloys siv hauv cov khoom siv hluav taws xob cua sov?

Vim li cas cov alloys siv hauv cov khoom siv hluav taws xob cua sov?

Raws li peb paub alloys muaj siab resistivity thiab siab melting point piv rau cov hlau ntshiab. Yog li cov hlau tsis tuaj yeem yooj yim hlawv lossis oxidize ntawm qhov kub siab dua. Tam sim no raws li peb xav kom kub siab dua hauv cov khoom siv cua sov yog li peb siv cov alloys hauv cov khoom siv cua sov.

Vim li cas cov phiaj xwm tseem ceeb siv rau hauv kev siv nyiaj txiag thiab kev kwv yees?

Vim li cas cov phiaj xwm tseem ceeb siv rau hauv kev siv nyiaj txiag thiab kev kwv yees?

Lub Rooj Milestones yog ib qho tseem ceeb tshaj plaws hauv koj txoj kev npaj ua lag luam. Nws teeb txoj kev npaj rau hauv cov tswv yim, cov ntsiab lus tseem ceeb, nrog cov peev txheej tiag, hnub kawg, thiab kev tswj xyuas lub luag haujlwm. Nws pab koj ua kom pom tseeb thaum koj tab tom sau koj txoj kev npaj ua lag luam, thiab tom qab ntawd, cov lus Milestones thiab cov phiaj xwm-vs.

Vim li cas gutta-percha siv hauv cov kwj dej hauv paus?

Vim li cas gutta-percha siv hauv cov kwj dej hauv paus?

Cov txheej txheem yuav tsum ntxuav tawm cov kab hniav uas muaj kab mob, tshem tawm cov kab mob thiab tom qab ntawd muab cov hniav thiab muab khi. Gutta percha yog cov tshuaj uas yog siv los sau cov hniav kom tsis txhob kis kab mob. Gutta percha yog ib qho thermoplastic filling uas yog cua sov thiab ces nias rau hauv cov kwj hniav.