I-Constellation ingumqondo oyisisekelo ekushintsheni kwedijithali. Uma sithumela amasignali edijithali, ngokuvamile asithumeli u-0 noma u-1 ngokuqondile, kodwa siqale sakha iqembu lamasignali angu-0 no-1 (amabhithi) ngokuvumelana neyodwa noma ambalwa. Isibonelo, zonke izingcezu ezimbili zakha iqembu, okungukuthi, 00, 01, 10, kanye no-11. Kunezifunda ezine sezizonke (uma zingekho izingcezu ezintathu, kunezifunda eziyisishiyagalombili, njalonjalo). Ngalesi sikhathi, singakhetha i-QPSK (ukuguqulwa kwezigaba ezine, okuhambisana nezifunda ezine ezandulele ze-00, 01, 10, kanye no-11), Amaphuzu amane e-QPSK akha umlaza we-QPSK. Iphuzu ngalinye liku-90 degrees kude namaphoyinti aseduze (i-amplitude iyafana). Iphoyinti lomlaza lihambisana nophawu lokuguquguquka. Ngale ndlela, lonke uphawu lokuguquguquka oluthunyelwe luwulwazi oluphindwe kabili kunoluthunyelwe kancane.
Umlaza wokuguquguquka kwe-QPSK
Umdwebo womlaza wesignali eyamukelwe
Lapho wamukela futhi wehlisa isiginali ye-QPSK, hlulela ukuthi iyiphi isiginali ethunyelwa ngokuya ngebanga phakathi kwesiginali eyamukelwe kanye namaphuzu amane kumlaza (ngokuvamile okubizwa ngokuthi ibanga laseYurophu), futhi unqume ukuthi yiliphi iphuzu eliseduze kakhulu nephuzu lokudilizwa.
Ngakho-ke, umdwebo womlaza usetshenziswa kakhulu ukwenza imephu ngesikhathi sokushintshwa (njenge-QPSK, 16QAM, 64QAM, njll.) kanye nokuthola ukuthi yiliphi iphuzu elithunyelwa ngesikhathi sokwamukela ukuze idatha yehliswe kahle.
Okungenhla incazelo yolwazi yeshadi le-Constellation elethwe yi-Shenzhen Haidiwei Optoelectronics Technology Co., Ltd., engumkhiqizi wezokuxhumana obonakalayo futhi okhiqiza ukuxhumana.imikhiqizo.
