An gabatar da OFDM a cikin IEEE802.11a. Dangane da wannan hanyar daidaitawa, muna buƙatar sanin menene OFDM don fahimtar ƙa'idodi daban-daban.
Menene OFDM?
OFDM fasaha ce ta musamman mai ɗaukar nauyi. Wannan fasaha na da nufin raba tashoshi zuwa wasu tashoshi na orthogonal da yawa, sannan a mayar da siginar bayanai masu sauri zuwa magudanar ruwa masu saurin gudu don watsa iri ɗaya, waɗanda ake daidaita su kuma ana watsa su a kowane tashoshi. Kowane mai ɗaukar kaya yana da ƙayyadaddun ƙayyadaddun ƙayyadaddun bayanai zuwa ɗayan, kuma tashoshi na mitar bayan yaɗa bakan na'ura na iya haɗuwa, rage tsangwama tsakanin masu ɗaukar kaya da haɓaka amfani da bakan.
Yadda za a fahimci kothogonal babu tsangwama: lokacin da ɗaya mai ɗaukar kaya ya kai kololuwa, girman girman ɗayan mai ɗaukar kaya shine 0. Wato, masu ɗaukar kaya biyu suna orthogonal ne ba tare da tsangwama ba. Kamar yadda aka nuna a cikin hoton da ke ƙasa, lokacin da girman isowar shuɗi ya kasance mafi girma, ɗayan mai ɗaukar kaya shine 0.
Hakanan, OFDM na iya amfani da masu ɗaukar kaya waɗanda suka zoba saboda an ayyana masu ɗaukar kaya ta hanyar da ke sauƙaƙa rarrabewa.
An raba siginar zuwa masu ɗaukar kaya uku, daga hagu zuwa dama. Ana amfani da kololuwar kololuwar jigilar kaya don yin rikodin bayanai, kamar yadda aka nuna a jajayen ɗigo a cikin adadi, wanda yayi daidai da layin sikelin 0 na ƙasa. Ɗayan ya kai kololuwa, sauran kuma ya kai 0. Waɗannan ƙananan jiragen ruwa an tsara su da gangan don ci gaba da dangantaka ta asali da juna. Kololuwar kowane mai jigilar kayayyaki A wannan lokacin, girman sauran masu ɗaukar kaya biyu shine 0.
5GHz OFDM tashar:
Tashar 5GHz tana da masu ɗaukar kaya 52, kuma kowane mai ɗaukar kaya yana da 312.5 kHz. Akwai tashoshi 48 don watsa bayanai, kuma ana amfani da tashoshi 4 don tuntuɓar lokaci.
Fasahar gyare-gyaren subchannel ta OFDM tana amfani da QAM (QAM shine taƙaitaccen tsarin daidaitawa na quadrature, wanda aka fassara a matsayin "kwankwasar girman girman quadrature" a cikin Sinanci). QAM yana amfani da girman girma da lokaci na igiyoyin jigilar kaya don watsa bayanai.
Abin da ke sama shine bayanin ilimin ƙa'idar OFDM-802.11 da aka kawo mukuShenzhen HDV Phoelectron Technology Co., Ltd. fatan wannan labarin zai iya taimaka muku don ƙara ilimin ku. Bayan wannan labarin idan kuna neman ingantaccen kamfanin kera kayan sadarwar fiber na gani za ku iya la'akari da sugame da mu.
Kayayyakin sadarwar da kamfanin ke samarwa sun hada da:
Module: na gani fiber modules, Ethernet modules, na gani fiber transceiver modules, na gani fiber damar kayayyaki, SSFP Optical modules, kumaSFP Optical fibers, da dai sauransu.
ONUcategory: EPON ONU, AC ONU, fiber optic ONU, CATV ONU, GPON ONU, XPON ONU, da dai sauransu.
OLTaji: Canji a farashin OLT, Farashin GPON OLT, Farashin EPON OLT, sadarwaOLT, da dai sauransu.
Samfuran da ke sama zasu iya tallafawa yanayin cibiyar sadarwa daban-daban. Don samfuran da ke sama, ƙwararrun ƙwararrun ƙungiyar R&D masu ƙarfi an haɗa su don ba da tallafin fasaha ga abokan ciniki, kuma ƙungiyar kasuwanci mai tunani da ƙwararrun za ta iya samar da ayyuka masu inganci ga abokan ciniki da wuri.shawarakuma daga baya aiki.