MIMO thev naus laus zis siv ntau lub kav hlau txais xov kom xa thiab txais cov teeb liab hauv kev sib txuas lus wireless.Ntau lub kav hlau txais xov rau ob qho tib si transmitters thiab receivers loj heev txhim kho kev sib txuas lus.MIMO thev naus laus zis feem ntau yog siv rau hauvkev sib txuas lus mobilecov teb, cov cuab yeej no tuaj yeem txhim kho lub peev xwm, kev pab cuam ntau, thiab teeb liab-rau- suab nrov piv (SNR).
1.Definition of MIMO
MIMO Wireless Communication technology hu ua Multiple-Input Multiple-Out-put (Multiple-Input Multiple-Out-put) thev naus laus zis, thiab nws tseem tuaj yeem hu ua Multiple Transmit Multiple Receive Antenna (MTMRA, Multiple Transmit Multiple Receive Antenna) technology.
Nws lub hauv paus ntsiab lus tseem ceeb yog siv ntau lub kav hlau txais xov xa xov thiab tau txais cov kav hlau txais xov ntawm qhov kawg xa tawm thiab tau txais qhov kawg, thiab muaj peev xwm paub qhov txawv cov cim xa mus lossis los ntawm cov lus qhia sib txawv.Nws kuj tseem tuaj yeem txhim kho lub peev xwm, kev pab them nqi thiab teeb liab-rau-suab nrov piv tsis tau nce bandwidth thiab xa lub zog, thiab txhim kho kev sib kis zoo ntawm cov teeb liab wireless.
Nws yog qhov sib txawv ntawm cov txheej txheem kev teeb tsa ib txwm muaj nyob rau hauv uas nws kawm txog teeb meem ua teeb meem los ntawm ob lub sijhawm thiab qhov chaw.Raws li pom hauv daim duab hauv qab no, uas yog MIMO system nrog Nt thiab Nr kav hlau txais xov ntawm lub transmitter thiab receiver feem.
Yooj yim MIMO system
2. Kev faib tawm ntawm MIMO
Raws li cov xwm txheej sib txawv thiab qhov chaw sib txawv wireless, hauv qab no yog plaub hom kev ua haujlwm MIMO: SISO, MISO thiab SIMO.
3. Cov ntsiab lus tseem ceeb hauv MIMO
Muaj ntau lub tswv yim koom nrog hauv MIMO, qhov tseem ceeb tshaj plaws ntawm cov no yog peb yam hauv qab no: ntau haiv neeg, kev sib tw thiab kev sib tw beamforming.
Diversity thiab multiplexing xa mus rau ob hom kev ua haujlwm ntawm MIMO thev naus laus zis.Ntawm no peb yuav qhia koj cov ntsiab lus yooj yim ua ntej.
●Diversity: yog hais txog kev sib kis ntawm tib lub teeb liab ntawm ntau txoj kev sib kis ywj pheej.Ntawd yog, tib lub teeb liab, ywj siab raws.
●Multiplexing: hais txog kev xa tawm ntau yam kev ywj pheej ntawm tib txoj kev sib kis.Ntawd yog, cov cim sib txawv, cov channel sib txawv.
Ntawm no peb siv ib lub rooj los qhia luv luv qhia txog kev sib raug zoo ntawm lawv.
| Hom kev ua haujlwm | Lub hom phiaj | Txoj kev | txhais tau tias |
| Ntau haiv neeg | Txhim kho kev ntseeg siab | Txo fading | space-time coding |
| Multiplexing | Txhim kho kev xa tawm | Siv qhov zoo ntawm fading | Spatial Multiplexing |
Thaum kawg, cia peb tham txog beamforming.Ntawm no peb tseem yuav muab koj lub tswv yim yooj yim: nws yog lub teeb liab ua tshuab uas siv lub sensor array xa thiab tau txais cov teeb liab nyob rau hauv ib qho kev taw qhia.Nws yog ua kom lub teeb liab xa los ntawm tus kav hlau txais xov ntau qhov kev taw qhia, zoo dua tuaj yeem taw qhia qhov tseeb ntawm tus neeg siv yam tsis muaj lub zog to.
● Nyob rau hauv rooj plaub 1, lub kav hlau txais xov system radiates yuav luag tib lub zog ntawm txhua qhov kev qhia.Txawm hais tias qhov kev ncua deb ntawm peb tus neeg siv thiab lub hauv paus chaw nres tsheb, txawm hais tias txhua tus neeg siv tuaj yeem tau txais cov teeb liab sib npaug ntawm lub zog, tseem muaj ntau lub teeb liab dispersed nyob rau hauv qhov chaw dawb, uas ua rau lub zog ntawm lub hauv paus chaw nres tsheb.
● Nyob rau hauv rooj plaub 2, lub zog hluav taws xob ntawm lub kav hlau txais xov yog qhov taw qhia tsis tshua muaj siab, uas yog, lub zog loj npaum li qhov ua tau nyob rau hauv cov kev taw qhia uas tus neeg siv muaj thiab lub zog yuav luag muab faib rau hauv cov lus qhia tsis muaj txiaj ntsig.Cov thev naus laus zis uas tsim cov kav hlau txais xov yog qhov peb hu ua beamforming.
4.Qhov zoo ntawm MIMO
● Channel muaj peev xwm txhim kho
MIMO cov tshuab tuaj yeem ua kom muaj peev xwm channel nyob rau hauv cov teeb liab-rau-suab nrov piv rau cov xwm txheej thiab tuaj yeem siv nyob rau hauv cov xwm txheej uas lub transmitter tsis tuaj yeem tau txais cov ntaub ntawv channel.Nws kuj tseem tuaj yeem ua kom cov ntaub ntawv sib kis tau zoo dua yam tsis tau nce lub bandwidth thiab kav hlau txais xov xa xov hluav taws xob, yog li txhim kho kev siv spectrum zoo heev.
● Txhim kho channel kev ntseeg tau
Siv cov cuab yeej sib txuas ua ke uas muab los ntawm MIMO channel tuaj yeem txhim kho kev ruaj ntseg ntawm lub kaw lus thiab ua rau kom muaj kev sib kis.
Xaus
FDM-6680 Nwsyog ib lub xov tooj cua qis-SwaP, tus nqi qis 2x2 MIMO xov tooj cua muab kev pab cuam ntev nyob thoob plaws thaj chaw ua haujlwm nrog 100-120Mbps cov ntaub ntawv tus nqi.Xav paub ntxiv thov mus saibIWAVElub vev xaib.
Post lub sij hawm: Dec-18-2023
