Abathengi abaninzi bayabuza xa bekhetha aisidlulisi sevidiyo esibalulekileyo- yintoni umahluko phakathiCOFDM isidlulisi ividiyo engenazingcingokunye OFDM ividiyo transmitter?
I-COFDM inekhowudi ye-OFDM, Kule bhlog siza kuxoxa ngayo ukukunceda ufumanise ukuba yeyiphi inketho enokuba ngcono kwisicelo sakho.
1. OFDM
Itekhnoloji ye-OFDM yahlula itshaneli enikiweyo kwiitshaneli ezininzi ze-orthogonal kwi-domain frequency.I-subcarrier enye isetyenziselwa ukumodareyitha kwi-subchannel nganye, kwaye i-subcarrier nganye ihanjiswa ngokufanayo.Ngale ndlela, nangona itshaneli iyonke ayingomcaba kwaye ikhetha rhoqo.Kodwa i-subchannel nganye ithe tyaba.Ukuhanjiswa kwe-Narrowband kwenziwa kwi-sub-channel nganye, kwaye i-bandwidth yesignali incinci kune-bandwidth ehambelanayo yeshaneli.Ke ngoko, ukuphazamiseka phakathi kweempawu zamaza amaza kunokupheliswa kakhulu.
Ekubeni abathwali betshaneli engaphantsi nganye be-orthogonal omnye komnye kwinkqubo ye-OFDM.Iintlobo zazo ziyadibana.Oku akunciphisi nje ukuphazamisana phakathi kwe-sub-carriers, kodwa kukwaphucula ukusetyenziswa kwe-spectrum.
2. COFDM
COFDMis Ikhowudi ye-Orthogonal Frequency Division Multiplexing, oko kukuthi
phambi kohlengahlengiso lwe-OFDM, ikhowudi yedijithali yomjelo ifakwe ngekhowudi.
Yenza ntoni le Khowudi?Ikhowudi yesitishi (ikhowudi yomthombo kukusombulula ingxaki yokusebenza kakuhle, kunye nekhowudi yomzila kukuqinisekisa ukuthembeka kokuhanjiswa).
Indlela ekhethekileyo yile:
2.1.Phambili Ukulungiswa Kwemposiso(FEC)
Umzekelo, i-100 bits yedatha kufuneka imodareyithwengenxahambisange.Okokuqala yitshintshe ibe ngamasuntswana angama-200,.Xa umqondiso ufunyenwe, nokuba kukho ingxaki yokuhanjiswa kweebhithi ze-100, idatha echanekileyo isenokuthi idilizwe.Ngamafutshane, kukongeza ukuphindaphinda ngaphambi kokumodareyitha ukuphucula ukuthembeka kosulelo.Oku kubizwa ngokuba luLungiso lwempazamo yangaphakathi (FEC) kwiinkqubo ze-COFDM.Kwaye namt yiparameter ebalulekileyo yenkqubo yeCOFDM.
2.2.Isithuba sokugada
Fokanye injongo solvngeuninzi-ingxaki yendlelayiyo iuphawu olugqithisiweyo lufikelela ekupheleni kokufumana ngeendlela ezininzi zothumelo. Aisithuba somlindi sifakwe phakathi kwamasuntswana edatha agqithiselweyo.
3.Isiphelo
Umahluko phakathi kwe-COFDM kunye ne-OFDM kukuba iikhowudi zokulungiswa kweempazamo kunye namaxesha okulinda zongezwa ngaphambi kokuguqulwa kwe-orthogonal ukwenza ukuhanjiswa komqondiso kusebenze ngakumbi.
I-OFDM isombulula isitishi esikhethiweyo siphela kubuninzi-imeko yendawo yendlela kakuhle, kodwa ayikaloyisi umjelo othe tyaba.
I-COFDM yenza ukuba kucime umqondiso wekhowudi yeyunithi nganye ngexesha lothumelo ukuze luthathwe njengoluzimeleyo ngokweenkcukacha-manani ngokufakwa kweekhowudi, ngokwenjenjalo iphelisa impembelelo yokuncipha komcaba kunye nokutshintsha kwamaza e-Doppler.
4.Ukusetyenziswa kweOFDM kunye neCOFDM
I-COFDM ilungele kakhulu ukuhanjiswa kwamacingo ngexeshaisantya esiphezulueshukumayo.Njenge Hd wngokungakhathalitiransmittervehicleminye, iinqanawaumnatha wonxibelelwano, iihelicopterCofdm Hd Transmitter kunyelqhubekarumsindodironevingcamangotiransmitter.
I-COFDM nayo inamandla anamandla e-nlos.Ilungele ukusetyenziswa kwiindawo ezingabonwayo nezinezithintelo ezifana nemimandla yasezidolophini, amahlomela edolophu, nezakhiwo, kwaye ibonisa “i-diffraction” kunye “nokungena” okugqwesileyo.
I-OFDM yenza usetyenziso olululo lwe-spectrum kwaye inokuxhathisa ukufiphala okukhethiweyo, ehlala isetyenziswa kwi-LTE kunye nenethiwekhi ye-wifi.
Ixesha lokuposa: Jun-12-2023
