Cov qauv yooj yim ntawm binary digital modulation yog:Binary amplitude keying (2ASK) - amplitude hloov ntawm lub teeb liab nqa; Binary zaus hloov keying (2FSK) - zaus hloov ntawm cov teeb liab nqa; Binary theem hloov pauv keying (2PSK)-theem hloov ntawm cov teeb liab cov cab kuj. Differential phase shift keying (DPSK) tau tsim vim tias theem ntawm 2PSK system tsis paub meej.
2ASK thiab 2PSK ob leeg xav tau ob zaug ntau npaum li bandwidth raws li lub cim tus nqi, thaum 2FSK xav tau bandwidth ntau dua 2ASK thiab 2PSK.
Qhov kev ua yuam kev me ntsis ntawm ntau yam binary digital modulation systems nyob ntawm lub tswv yim teeb liab-rau- suab nrov piv r ntawm lub demodulator. Nyob rau hauv cov nqe lus ntawm anti-additive Gaussian dawb suab nrov, coherent 2PSK muaj qhov ua tau zoo tshaj plaws, ua raws li 2FSK, thiab 2ASK yog qhov phem tshaj.
Nug yog ib qho ntawm cov qauv kev hloov kho thaum ntxov. Nws cov txiaj ntsig yog tias nws siv lub tshuab hluav taws xob siab thiab muaj cov cuab yeej siv yooj yim. Nws cons yog tias nws tsisua haujlwm zoo tiv thaiv lub suab nrov thiab muaj kev nkag siab zoo rau cov kev hloov pauv hauv cov yam ntxwv ntawm cov channel, uas ua rau nws nyuaj kom tau txais tus qauv txiav txim siab ua haujlwm hauv lub xeev qhov kev txiav txim siab zoo tshaj plaws.
FSK yog ib qho kev hloov pauv tsis tseem ceeb hauv kev sib txuas lus digital. Nws qhov zoo dua yog tias nws muaj peev xwm tiv thaiv kev cuam tshuam thiab tsis cuam tshuam los ntawm kev hloov pauv ntawm cov channel tsis, yog li FSK tshwj xeeb yog tsim rau fading raws; Qhov tsis zoo yog tias cov khoom siv band dav dav, tshwj xeeb tshaj yog rau mf-sk, thiab kev siv band yog tsawg. Tam sim no, FM system feem ntau yog siv rau nruab nrab thiab qis-ceev cov ntaub ntawv xa mus.
PSK lossis DPSK yog ib qho kev hloov kho nrog kev sib kis tau zoo. Nws lub peev xwm los tiv thaiv lub suab nrov muaj zog dua li ntawm ASK thiab FSK, thiab nws tsis yooj yim cuam tshuam los ntawm kev hloov pauv ntawm cov yam ntxwv channel. Yog li ntawd, nws tau dav siv nyob rau hauv siab thiab nruab nrab-ceev cov ntaub ntawv kis tau tus mob. Kev hloov pauv tsis tu ncua (PSK) muaj qhov teeb meem ntawm cov cab kuj theem tsis meej pem hauv coherent demodulation, uas tsis tshua muaj siv hauv kev xa ncaj qha hauv kev xyaum. MDPSK yog siv ntau dua.
Cov saum toj no yog tsab xov xwm "Binary digital modulation," coj los rau koj los ntawm Shenzhen HDV photoelectric Technology Co., Ltd. Cov khoom sib txuas lus tsim los ntawm lub tuam txhab npog:
Module qeb: optical fiber modules, Ethernet modules, optical fiber ntau transceiver modules, optical fiber nkag modules, SSFP optical modules, thiabSFP optical fibers, lwm.
ONUqeb: EPON UA, AC ONU, Optical fiber ntau ONU, CATV UA, GPON UA, XOV TOOJ, lwm.
OLTchav kawm: OLT hloov, GPON OLT, PEB OLT, kev sib txuas lusOLT, lwm.
Cov khoom lag luam module saum toj no tuaj yeem muab kev txhawb nqa rau cov xwm txheej sib txawv. Ib pab neeg R & D muaj zog thiab muaj zog tuaj yeem pab cov neeg siv khoom nrog cov teeb meem kev lag luam, thiab pab pawg ua lag luam muaj kev xav thiab kev ua haujlwm tuaj yeem pab cov neeg siv khoom tau txais kev pabcuam zoo thaum lub sijhawm sib tham ua ntej thiab ua haujlwm tom qab tsim khoom. Zoo siab txais tos kojtiv tauj pebrau txhua yam kev nug.
