Ohlelweni lokuxhumana lwedijithali, umamukeli uthola isamba sesiginali edlulisiwe nomsindo wesiteshi.
Iukwamukela elilungileyamasignali edijithali asekelwe kumbandela “ongcono kakhulu” onamathuba amancane kakhulu wephutha. Amaphutha acatshangelwe kulesi sahluko ikakhulukazi ngenxa yomsindo we-Gaussian omhlophe okhawulelwe webhendi. Ngaphansi kwalo mcabango, isiginali eguquliwe yedijithali kanambambili ihlukaniswe yaba izinhlobo ezintathu: isignali eqondile, isignali encike esigabeni, nesiginali eguquguqukayo. Amathuba amancane okuba khona kwephutha ahlaziywa ngokomthamo. Ngaphezu kwalokho, amathuba ephutha okuthola amasiginali e-baseband enamazinga amaningi nawo ayahlaziywa.
Iumgomo oyisisekelo wokuhlaziyaukubheka wonke amanani ayisampula ophawu lwesignali eyamukelwe njengevekhtha esikhaleni sevekhtha esamukelwe esingu-k-dimensional futhi kuhlukanise isikhala sevekhtha etholiwe sibe izifunda ezimbili. Ukuthi ingabe iphutha lenzeka noma cha kunqunywa kuye ngokuthi i-vector etholiwe iwela kusiphi isifunda. Umdwebo webhulokhi oyinhloko womamukeli ongcono kakhulu ungatholwa futhi izinga lephutha elincane lingabalwa ngombandela wesinqumo. Lesi silinganiselo sephutha elincane ngokwethiyori silungile—okungukuthi, sincane kakhulu esingenzeka ngokomcabango.
Iiphutha elilungile lebhithiIzinga lesignali yokunquma kanambambili linqunywa i-coefficient p yezimpawu ezimbili kanye nesilinganiso sesignali-kumsindo u-E/n, kodwa alinabo ubudlelwano obuqondile nefomu lesiginali yegagasi. Uma i-coefficient p incane, izinga lephutha lebhithi liyancipha. I-coefficient yokuxhumanisa yesiginali ye-2PSK incane kakhulu (p =-1), futhi izinga layo lephutha elincane liphansi kakhulu. Isiginali ye-2FSK ingathathwa njengesignali ye-quadrature futhi i-coefficient yayo yokuxhumanisa ingu-p = 0.
Okweisignali yesigaba esilandelayokanye nesignali eguquguqukayo, kuphelaIsignali ye-FSKisetshenziswa njengommeleli wokuhlaziya, ngoba kulesi siteshi, ukuphakama kanye nesigaba sesiginali kushintsha ngokungahleliwe ngenxa yethonya lomsindo, ngakho isignali ye-FSK ifaneleka kakhulu isicelo. Njengoba isiteshi sibangela izinguquko ezingahleliwe esigabeni sesignali, ukudilizwa okuhambisanayo akukwazi ukusetshenziswa. Esikhundleni salokho, ukwehliswa kwe-demodulation okungahlangene kuyindlela engcono kakhulu yokwamukela isignali.
Uma kuqhathaniswa nezilinganiso zephutha elincane lesamukeli sangempela kanye neumamukeli ophelele, kungabonakala ukuthi uma isilinganiso samandla esiginali kuya emsindweni r kusamukeli sangempela silingana nesilinganiso samandla ophawu namandla omsindo wokuminyana kwe-spectral kumamukeli alungile E/n, ukusebenza kwesilinganiso esincane sephutha okubili kuyefana. Nokho, lokhu akwenzeki ngaso sonke isikhathi ngenxa yabamukeli bangempela. Ngakho-ke, ukusebenza komamukeli wangempela kuhlala kubi kakhulu kunokwamukeli ongcono kakhulu.
Yilokhu Shenzhen HDV Phoelectron Technology Co., Ltd. kuwe. ikulethela "Ukwamukela Okungcono Kakhulu Kwezimpawu Zedijithali". Ngethemba ukuthi lesi sihloko singakusiza ukukhulisa ulwazi lwakho. Ngaphandle kwalesi sihloko uma ufuna inkampani enhle yabakhiqizi bemishini yokuxhumana ye-fiber ongase uyicabangeleMayelana NATHI.
I-Shenzhen HDV photoelectric Technology Co., Ltd.ikakhulukazi umkhiqizi wemikhiqizo yezokuxhumana. Njengamanje, imishini ekhiqizwayo ihlanganisaUchungechunge lwe-ONU, optical module uchungechunge, Uchungechunge lwe-OLT, futhiuchungechunge lwe-transceiver. Singahlinzeka ngezinsizakalo ezenziwe ngezifiso ezimweni ezahlukahlukene. Wamukelekilebonisana.
