Tus qauv Digital Mobile Radio (DMR) yog tsim los ntawm European Telecommunications Standards Institute (ETSI) thiab tau pom zoo thawj zaug hauv xyoo 2005. DMR ntiav cov thev naus laus zis Time Division Multiple Access (TDMA), faib 12.5 kHz channel rau hauv ob lub sijhawm. Txhua lub sij hawm qhov ntev 30 milliseconds, thiab cov ntaub ntawv kis tus nqi yog 9.6 kbps ib qhov.
DMR txhawb peb hom kev ua haujlwm: Direct Mode, Repeater Mode, thiab Trunking Mode. Nws cov zaus ua haujlwm muaj xws li VHF (136-174 MHz) thiab UHF (400-470 MHz). Cov txheej txheem siv peb -tier architecture, encompassing unlicensed (Tier 1), daim ntawv tso cai cov pa (Tier 2), thiab daim ntawv tso cai trunking (Tier 3) ua hauj lwm hom.
DMR ntiav 4FSK kev hloov kho. Lub suab encoding thiab decoding yog ua los ntawm AMBE algorithm, feem ntau ntawm cov ntaub ntawv tus nqi ntawm 3.6 kbps. Qhov zoo ntawm DMR suav nrog kev ua haujlwm siab spectral, kev sib raug zoo nrog cov tshuab analog, thiab cov khoom siv qis dua. Piv nrog rau lwm cov qauv xov tooj cua digital, DMR muaj qhov sib txawv ntawm cov nqi, kev ua tau zoo spectral, thiab siv tau.
