OFDM yakatsanangurwa muIEEE802.11a.Zvichienderana neiyi nzira yekumisikidza, isu tinofanirwa kuziva kuti OFDM chii kuti tinzwisise akasiyana maprotocol.
Chii chinonzi OFDM?
OFDM yakakosha yakawanda-inotakura modulation tekinoroji.Iyi tekinoroji inovavarira kupatsanura chiteshi kuita akati wandei orthogonal sub-channel, uye wozoshandura yakakwirira-yekukurumidza data masaini kuita yakaderera-kumhanya-yepasi-data hova yekufambisa kwakafanana, iyo inogadziridzwa uye inofambiswa pane yega yega chiteshi.Imwe neimwe subcarrier ndeye orthogonal kune imwe, uye frequency chiteshi mushure mekupararira spectrum modulation inogona kupindirana, ichideredza kupindirana pakati pevatakuri uye nekuvandudza spectrum kushandiswa.
Nzira yekunzwisisa sei orthogonal pasina kupindira: kana imwe subcarrier inosvika pakakwirira, iyo amplitude yeimwe subcarrier ndeye 0. Ndiko kuti, ma subcarriers maviri ari orthogonal pasina kupindira.Sezvinoratidzwa mumufananidzo uri pazasi, kana iyo yebhuruu yekusvika amplitude iri yepamusoro, imwe subcarrier i0.
Zvakare, OFDM inogona kushandisa subcarriers inopindirana nekuti subcarriers inotsanangurwa nenzira inoita kuti zvive nyore kupatsanura.
Chiratidzo chakakamurwa kuita matatu subcarriers, kubva kuruboshwe kuenda kurudyi.Imwe neimwe subcarrier peak inoshandiswa kukodha data, sezvakaratidzwa mune dzvuku doti mumufananidzo, rinoenderana ne0 chiyero mutsetse pazasi.Mumwe anosvika pakakwirira, uye mamwe anosvika 0. Aya ma subcarriers akagadzirirwa nemaune kuchengetedza hukama hwe orthogonal kune mumwe nemumwe.Iyo yepamusoro yeimwe neimwe subcarrier Panguva ino, iyo amplitude yemamwe maviri madiki anotakura ndeye 0.
5GHz OFDM chiteshi:
Iyo 5GHz chiteshi ine 52 subcarriers, uye imwe neimwe subcarrier ine 312.5 kHz.Kune 48 chiteshi chekufambisa data, uye mana chiteshi anoshandiswa pachikamu chereferensi.
Iyo OFDM subchannel modulation tekinoroji inoshandisa QAM (QAM ndiyo chidimbu che quadrature amplitude modulation, inoshandurwa se "quadrature amplitude modulation" muchiChinese).QAM inoshandisa amplitude uye chikamu chekutakura wave kutumira ruzivo.
Izvo zviri pamusoro ndiyo tsananguro yeruzivo yeOFDM-802.11 protocol yakaunzwa kwauriShenzhen HDV Phoelectron Technology Co., Ltd.Ndinovimba chinyorwa ichi chinogona kukubatsira iwe kuwedzera ruzivo rwako.Kunze kwechinyorwa ichi kana iwe uchitsvaga yakanaka optical fiber yekutaurirana michina yekugadzira kambani yaungafunganezvedu.
Zvigadzirwa zvekutaurirana zvinogadzirwa nekambani zvinovhara:
Module: optical fiber modules, Ethernet modules, Optical fiber transceiver modules, Optical fiber access modules, SSFP Optical modules,uyeSFP optical fibers, nezvimwewo.
ONU chikamu: EPON ONU, AC ONU, Optical fiber ONU, CATV ONU, GPON ONU, XPON ONU, nezvimwewo.
OLT kirasi: kuchinja OLT, GPON OLT, EPON OLT, kutaurirana OLT, nezvimwewo.
Izvo zviri pamusoro zvigadzirwa zvinogona kutsigira akasiyana network mamiriro.Kune zvigadzirwa zviri pamusoro, nyanzvi uye ine simba R & D timu yakapetwa kuti ipe rubatsiro rwehunyanzvi kune vatengi, uye inofunga uye inyanzvi bhizinesi timu inogona kupa emhando yepamusoro masevhisi evatengi 'kutanga.consultationuye gare gare kushanda.