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Kèk tan de sa, yon papye ki te pibliye nan "Elektwonik" atire atansyon toupatou. Chèchè yo te itilize eksperyans yo demontre konplo a modulation nan yon plen-duplex ki ap dirije-a-LEDVLC vizib sistèm kominikasyon limyè ak poul kòm transmeteur ak récepteurs, nan depandans longèdonn. Konpare ak pèfòmans tankou pousantaj erè ti jan, rezilta a montre ke VLC gen avantaj evidan sou frekans radyo tradisyonèl kominikasyon san fil.
Kominikasyon limyè vizib (VLC), ke yo rele tou nm vag kominikasyon, mwenyon teknoloji kominikasyon ki itilize spectre limyè vizib 380 a 740 nm kòm yon konpayi asirans enfòmasyon. Paske nan efikasite segondè li yo, lavi ki long ak karakteristik repons vit, poul yo pi apwopriye pou kominikasyon san fil pase lòt sous limyè vizib.
Konpare ak frekans radyo tradisyonèl (RF) kominikasyon san fil, VLC gen avantaj sa yo:
◆ VLC gen yon Pleasant san lisans sou 400THz ak resous spectre abondan.
◆ VLC fasil pou aplike, jis ajoute yon mikrokontroleur pou konstwi yon rezo ak ekipman ki ap dirije ki deja egziste.
◆ VLC itilize limyè vizib kòm konpayi asirans lan, ki pa pral lakòz entèferans elektwomayetik nan lòt ekipman elektwonik.
◆ VLC lyen ka fasilman mete gwo vitès lyen kominikasyon pi wo a 10Gb / s.
Se poutèt sa, rechèch sou VLC te anpil te pote soti, ki gen ladan fòmilasyon nan IEEE802.15.7 estanda VLC la. Nan eksperyans sa a, chèchè yo mezire tan an monte ak rapò siyal-a-bri (SNR) nan transmetè a ak reseptè ki ap dirije koulè, ak rezime depandans nan pèfòmans nan ki ap dirije-a-LEDVLC sou longèdonn nan transmetè a ak reseptè. Poul.
Nan syans anvan yo, sou-off kloure (OOK) se metòd la modulation ki pi senp ak pi tradisyonèl nan kominikasyon optik, ki te gen avantaj ki genyen nan konpleksite ki ba ak Pleasant ase. Estanda IEEE802.15.7VLC pwopoze batman pozisyon batman (PPM) pou sipòte gradyasyon. PPM se yon lòt konplo modulation ki ka reyalize pi wo efikasite pouvwa pase OOK. Sepandan, PPM mande pou yon sistèm pi konplèks ak konsomasyon Pleasant.
Orthogonal divizyon frekans miltiplikasyon (OFDM) se yon konplo modulation milti-konpayi asirans ki montre efikasite frekans segondè. Li kapab tou voye done nan segondè-frekans sub-transpòtè, se konsa ke sistèm lan gen rezistans fò ba-frekans limyè anbyen soti nan lòt sous ekleraj. Robustness. Yo nan lòd yo simonte enpèfeksyon yo nan pousantaj done ki ba ak emotivite nan lòt sous ekleraj nan ki ap dirije-a-LEDVLC, chèchè yo te adopte pi bon anviwònman an koulè ki ap dirije mete ak aplike modilite anplitid kwadratur (QAM) nan plen duplex la ki ap dirije-a-LEDVLC eksperyans. Ak dirèk aktyèl patipri optik òtogonal frekans divizyon miltiplikasyon (DCO-OFDM) konplo modulation.
Anplis de sa, chèchè yo te tou analize deformation la ak pèt siyal nan plen duplex ki ap dirije-a-LEDVLC sistèm lan. Nan sistèm plen-duplex ki ap dirije-a-LEDVLC, 32-QAMDCO-OFDM modulation ak ranvèse sikwi patipri yo te itilize pou reyalize yon pousantaj done maksimòm de 49kbps ak yon pousantaj erè ti jan nan <2.5 × 10-4. Yo kwè ke teknoloji ki ap dirije-a-ki ap dirije VLC pral kontribye nan vulgarizasyon toupatou nan teknoloji VLC.
lòt pwodwi nou an:
Pwofesyonèl pakè ekipman estasyon radyo FM
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