Kwinkqubo yonxibelelwano lwedijithali, into efunyanwa ngummkeli sisimbuku somqondiso ogqithisiweyo kunye nengxolo yetshaneli.
Ulwamkelo olululo lweempawu zedijithali lusekwe kubuncinci bempazamo enokwenzeka njengowona mgaqo "ogqwesileyo". Iimpazamo eziqwalaselwe kwesi sahluko zibangelwa ikakhulu yingxolo emhlophe ye-Gaussian elinganiselweyo. Phantsi kolu qikelelo, isiginali emodareyithiweyo yedijithali yokubini yahlulwe yangazindidi ezintathu: isignali eqinisekileyo, isignali yokuzithemba kunye nomqondiso wokuguquguquka, kunye nempazamo encinci enokwenzeka ihlalutywa ngokobungakanani nganye nganye. Ukongeza, impazamo yokufumana umqondiso we-multi-base band ihlalutywa.
Umgaqo osisiseko wohlalutyo kukuthatha ixabiso elipheleleyo lesampulu yento efumana umqondiso njengevektha kwi-K-dimensional ifumana isithuba se-vector, kwaye yahlule isithuba se-vector esifumanayo sibe yimimandla emibini. Qinisekisa ukuba impazamo yenzekile ngokweyiphi ingingqi ivektha efunyenweyo iwela kuyo. Umzobo webhloko womamkeli ofanelekileyo unokufunyanwa kwaye isantya sempazamo encinci singabalwa ngekhrayitheriya yesigqibo. Lo mlinganiselo wempazamo kancinane ngokwethiyori ungowona ulungileyo, oko kukuthi, ngokwethiyori eyona incinci inokwenzeka.
Elona nqanaba lempazamo yebit elona lophawu lokumisela lokubini limiselwa yi-coefficient yolungelelaniso lwe-p kunye ne-signal-to-noise ratio E/n., kodwa ayinabudlelwane obuthe ngqo kunye nophawu lwamaza. Incinci i-coefficient yonxulumano p, kokukhona isezantsi isantya sempazamo encinci. Isiginali ye-2PSK inowona mlinganiso uncinci wolungelelaniso (p=-1) kunye nenqanaba lempazamo yebit esezantsi. Isiginali ye-2FSK inokuthathwa njengophawu lwe-orthogonal kunye ne-coefficient yokulungelelanisa p=0.
Ngophawu olunomqondiso kunye nokuguquguquka, umqondiso we-FSK kuphela usetyenziselwa uhlalutyo lommeli, kuba kule tshaneli, i-amplitude kunye nesigaba somqondiso utshintshwa ngokungaqhelekanga ngenxa yempembelelo yengxolo, ngoko isignali ye-FSK ifanelekile kakhulu kwisicelo. I-demodulation engahambelaniyo yeyona ndlela ingcono yokufumana ngenxa yokutshintsha okungahleliwe kwesigaba somqondiso obangelwa ngumjelo.
Ngokuthelekisa inqanaba lempazamo elincinci lomamkeli kunye nowona mamkeli ungcono, kunokubonwa ukuba i-signal-to-noise power ratio r kwi-receiver yangempela ilingana nomlinganiselo we-E/n wekhowudi yamandla kunye ne-spectral yamandla engxolo. Uxinaniso kweyona mamkeli ingcono, isantya sempazamo encinci yokusebenza kwezi zimbini ziyafana. Nangona kunjalo, kuba oyena mntu owamkelayo uhlala engenakwenzeka ukufezekisa le ngongoma. Ke ngoko, ukusebenza kommkeli wangempela kuhlala kungaphantsi kowona mamkeli ungcono.
Lo nguShenzhenHDV Phoi-electron I-Technology Ltd. ukukuzisela malunga "neyona nto ingcono yolwamkelo lweempawu zedijithali", ithemba lokukunceda, kunye neShenzhenHDV Phoi-electron Technology Ltd. ukongezaI-ONUuthotho, uthotho lwe-transceiver,OLTseries, kodwa kwakhona ukuvelisa uthotho imodyuli, ezifana: Unxibelelwano imodyuli optical, imodyuli yonxibelelwano optical, network module optical, imodyuli yonxibelelwano optical, imodyuli ifayibha optical, Ethernet imodyuli ifayibha optical, njl., inokubonelela ngenkonzo ehambelanayo esemgangathweni kwiimfuno zabasebenzisi ezahlukeneyo ' , wamkele utyelelo lwakho.
