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    OFDM - Tlhaloso ea Protocol ea 802.11

    Nako ea poso: Sep-07-2022

    OFDM e hlahisitsoe ho IEEE802.11a. Ho ipapisitsoe le mokhoa ona oa ho feto-fetoha ha molumo, re hloka ho tseba hore na OFDM ke eng ho utloisisa liprothokholo tse fapaneng.

    OFDM ke eng?
    OFDM ke theknoloji e khethehileng ea ho feto-fetoha ha mefuta e mengata. Theknoloji ena e ikemiselitse ho arola mocha ka har'a likanale tse 'maloa tsa orthogonal, ebe o fetolela matšoao a data a lebelo le phahameng hore e be melapo e tlase ea data e tlase bakeng sa phetisetso e ts'oanang, e fetotsoeng le ho fetisoa ho mocha ka mong. E 'ngoe le e' ngoe ea li-subcarrier e na le orthogonal ho e 'ngoe,' me liteishene tsa maqhubu ka mor'a hore ho fetoloe li-spectrum modulation li ka kopana, ho fokotsa tšitiso pakeng tsa li-subcarriers le ho ntlafatsa tšebeliso ea spectrum.
    Mokhoa oa ho utloisisa orthogonal ha ho na ho kena-kenana: ha subcarrier e le 'ngoe e fihla tlhōrōng, amplitude ea subcarrier e' ngoe ke 0. Ke hore, li-subcarrier tse peli li na le orthogonal ntle le tšitiso. Joalokaha ho bontšitsoe setšoantšong se ka tlase, ha amplitude e putsoa ea ho fihla e le holimo ka ho fetisisa, e 'ngoe e nyenyane ke 0.
    OFDM ke eng 

    Hape, OFDM e ka sebelisa li-subcarriers tse tsamaisanang hobane li-subcarriers li hlalosoa ka tsela e etsang hore ho be bonolo ho li arola.

    Letšoao le arotsoe ka li-subcarriers tse tharo, ho tloha ho le letšehali ho ea ho le letona. Tlhōrō e 'ngoe le e' ngoe ea li-subcarrier e sebelisoa bakeng sa khouto ea data, joalo ka ha ho bonts'itsoe letheba le khubelu setšoantšong, le tsamaellanang le mohala oa 0 o ka tlase. E 'ngoe e fihla tlhōrōng,' me ba bang kaofela ba fihla ho 0. Li-subcarriers tsena li etselitsoe ka boomo ho boloka kamano ea orthogonal le e mong. Tlhōrō ea e 'ngoe le e' ngoe ea li-subcarrier Ka nako ena, amplitude ea tse ling tse peli tse nyenyane ke 0.

    5GHz OFDM kanale:
    Mocha oa 5GHz o na le li-subcarriers tse 52, 'me e mong le e mong o na le 312.5 kHz. Ho na le liteishene tse 48 tsa ho fetisa data, 'me liteishene tse 4 li sebelisoa bakeng sa litšupiso tsa mokhahlelo.
    5GHz OFDM mocha

    Theknoloji ea OFDM subchannel modulation e sebelisa QAM (QAM ke khutsufatso ea quadrature amplitude modulation, e fetoletsoeng e le "quadrature amplitude modulation" ka Sechaena). QAM e sebelisa amplitude le karolo ea leqhubu le tsamaisang ho fetisa tlhahisoleseling.

    Ka holimo ke tlhaloso ea tsebo ea protocol ea OFDM-802.11 e tlisoang ho uena keShenzhen HDV Phoelectron Technology Co., Ltd. ke tšepa hore sehlooho sena se ka u thusa ho eketsa tsebo ea hau. Ntle le sengoloa sena haeba u batla k'hamphani e ntle ea moetsi oa lisebelisoa tsa puisano tsa fiber o ka e nahanangmabapi le rona.

    Lihlahisoa tsa puisano tse hlahisoang ke k'hamphani li koahela:

    Mojule: optical fiber modules, Li-module tsa Ethernet, optical fiber transceiver modules, optical fiber access modules, SSFP optical modules, leSFP optical fibers, joalo-joalo.
    ONUsehlopha: EPON ONU, AC ONU, fiber ea optical ONU, CATV ONU, GPON ONU, XPON ONU, joalo-joalo.
    OLTsehlopha: Phetoho ea OLT, GPON OLT, EPON OLT, puisanoOLT, joalo-joalo.
    Lihlahisoa tse ka holimo li ka tšehetsa maemo a fapaneng a marang-rang. Bakeng sa lihlahisoa tse kaholimo, sehlopha se matla le se matla sa R&D se kopanngoe ho fana ka tšehetso ea tekheniki bakeng sa bareki, mme sehlopha sa khoebo se nahanang le se hloahloa se ka fana ka lits'ebeletso tsa boleng bo holimo bakeng sa bareki esale pele.therisanomme hamorao mosebetsi.



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