M ary Signalling yog dab tsi?
M ary Signalling yog dab tsi?

Video: M ary Signalling yog dab tsi?

Video: M ary Signalling yog dab tsi?
Video: 10 Signs Your Body Is Crying Out For Help 2024, Kaum ib hlis
Anonim

Ib M - ary kis tau tus mob yog ib hom kev hloov kho digital uas tsis yog kis ib qho me ntsis ntawm ib lub sijhawm, ob lossis ntau qhov khoom sib kis tau ib txhij. Hom kev sib kis no ua rau txo qis bandwidth channel. Cov txheej txheem no hu ua quadrature modulation.

Cov lus nug tseem yog, M ary PSK yog dab tsi?

M - ary Phase Shift Keying - lossis MPSK - yog qhov kev hloov pauv uas cov ntaub ntawv xaiv xaiv ib qho ntawm M theem hloov pauv hloov pauv ntawm cov cab kuj xa cov ntaub ntawv. Yog li ntawd, lub M ua tau waveforms tag nrho muaj tib lub amplitude thiab zaus tab sis txawv theem. Cov teeb liab constellations muaj M sib npaug spaced cov ntsiab lus ntawm ib lub voj voog.

Tsis tas li ntawd, binary modulation txheej txheem yog dab tsi? Cov binary cov ntaub ntawv modulates txhua theem, ua plaub cim sine signals hloov los ntawm 45 ° los ntawm ib leeg. Ob theem yog ntxiv ua ke los tsim cov teeb liab kawg. Txhua tus khub tshwj xeeb ntawm cov khoom tsim ib tus neeg nqa khoom nrog rau theem sib txawv (Table 1).

Nyob rau hauv no hais txog, lub teeb liab chaw daim duab yog dab tsi?

A constellation daim duab yog ib tug sawv cev ntawm a teeb liab modulated los ntawm cov qauv kev hloov pauv digital xws li quadrature amplitude modulation lossis theem-hloov keying. Nws qhia cov teeb liab raws li ib tug ob-dimensional xy-plane scatter daim duab nyob rau hauv lub complex dav hlau ntawm cim sampling instants.

Dab tsi yog lub cim hauv kev sib txuas lus digital?

Cov cim . A cim tej zaum yuav piav raws li ib tug mem tes hauv digital baseband kis tau tus mob los yog ib lub suab nyob rau hauv passband kis tau tus mob siv modems. A cim yog ib tug waveform, ib lub xeev los yog ib tug tseem ceeb mob ntawm lub kev sib txuas lus channel uas txuas ntxiv mus, rau lub sijhawm teem sijhawm.

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