I-Constellation yingcamango esisiseko kwimodyuli yedijithali. Xa sithumela imiqondiso yedijithali, ngokuqhelekileyo asithumeli u-0 okanye u-1 ngokuthe ngqo, kodwa kuqala senze iqela leempawu ze-0 kunye ne-1 (iibits) ngokomnye okanye ezininzi. Umzekelo, onke amasuntswana amabini enza iqela, oko kukuthi, 00, 01, 10, kunye no-11. Kukho imimiselo emine xa iyonke (ukuba akukho masuntswana amathathu, kukho iimo ezisibhozo, njalo njalo). Ngeli xesha, sinokukhetha i-QPSK (i-modulation-phase modulation, ehambelana namazwe amane angaphambili kwi-00, 01, 10, kunye ne-11), Amanqaku amane e-QPSK enza i-constellation ye-QPSK. Inqaku ngalinye li-90 degrees kude neendawo ezikufutshane (i-amplitude iyafana). Indawo yekroza ihambelana nesimboli yokumodyuliza. Ngale ndlela, yonke isimboli yokumodareyitha ethunyelweyo iphinda-phindwe kabini yolwazi oluthunyelweyo.
QPSK ukumodareyitha constellation
Umzobo weenkwenkwezi wesignali efunyenweyo
Xa ufumana kunye nokudiliza umqondiso we-QPSK, gweba ukuba yeyiphi isignali ethunyelwa ngokuhambelana nomgama phakathi komqondiso ofunyenweyo kunye namanqaku amane kwi-constellation (ngokuqhelekileyo ebizwa ngokuba ngumgama waseYurophu), kwaye unqume ukuba yeyiphi ingongoma ekufutshane ukuba yeyiphi indawo yokuchithwa.
Ke, umzobo weqela leenkwenkwezi usetyenziselwa ukwenza imephu ngexesha lokumodareyitha (njenge-QPSK, 16QAM, 64QAM, njl.) kunye nokucinga ukuba yeyiphi inqaku ethunyelwa ngexesha lokwamkelwa ukuze idatha ithotywe ngokuchanekileyo.
Oku ngasentla yingcaciso yolwazi lweTshati yeNkwenkwezi eziswa nguShenzhen Haidiwei Optoelectronics Technology Co., Ltd., engumenzi wonxibelelwano obonakalayo kwaye ivelisa unxibelelwano.iimveliso.
