OFDM yasabwe muri IEEE802.11a. Dushingiye kuri ubu buryo bwo guhindura, dukeneye kumenya icyo OFDM aricyo cyo gusobanukirwa protocole zitandukanye.
OFDM ni iki?
OFDM ni tekinoroji idasanzwe yo gutwara ibintu. Iri koranabuhanga rigamije kugabanya umuyoboro mu miyoboro myinshi ya orthogonal, hanyuma ugahindura ibimenyetso byihuta byihuta mu makuru yihuta yo munsi yamakuru yoherejwe kugirango abangikanye, ahindurwa kandi akanyuzwa kuri buri muyoboro. Buri subcarrier ni orthogonal kurindi, kandi imiyoboro yumurongo nyuma yo gukwirakwiza modulisiyo irashobora guhuzagurika, kugabanya itandukaniro riri hagati yimitsi no kunoza imikoreshereze.
Nigute ushobora gusobanukirwa orthogonal nta kwivanga: iyo subcarrier imwe igeze kumpinga, amplitude yizindi subcarrier ni 0. Nukuvuga ko subcarrier zombi ari orthogonal nta nkomyi. Nkuko bigaragara ku gishushanyo gikurikira, iyo amplitude yubururu igeze hejuru, izindi subcarrier ni 0.
Na none, OFDM irashobora gukoresha subcarrier zuzuzanya kuko subcarrier zisobanurwa muburyo bworoshye kubitandukanya.
Ikimenyetso kigabanyijemo ibice bitatu, uhereye ibumoso ugana iburyo. Buri mpinga ya subcarrier ikoreshwa mugukoresha amakuru, nkuko bigaragara mu kadomo gatukura ku gishushanyo, gihuye n'umurongo wa 0 munsi. Imwe igera ku mpinga, naho iyindi igera kuri 0. Izi subcarrier zakozwe nkana kugirango zikomeze umubano hagati yazo. Impinga ya buri subcarrier Muri iki gihe, amplitude yandi mato abiri ni 0.
Umuyoboro wa 5GHz OFDM:
Umuyoboro wa 5GHz ufite insimburangingo 52, kandi buri cyuma gifite 312.5 kHz. Hariho imiyoboro 48 yo kohereza amakuru, naho imiyoboro 4 ikoreshwa murwego rwo kwerekana.
Ikoreshwa rya tekinoroji ya OFDM ikoresha QAM (QAM ni impfunyapfunyo ya quadrature amplitude modulation, isobanurwa ngo "quadrature amplitude modulation" mu gishinwa). QAM ikoresha amplitude hamwe nicyiciro cyabatwara umurongo wohereza amakuru.
Ibyavuzwe haruguru nubusobanuro bwubumenyi bwa OFDM-802.11 protocole yazanwe naweShenzhen HDV Phoelectron Technology Co., Ltd.. twizere ko iyi ngingo ishobora kugufasha kongera ubumenyi. Usibye iyi ngingo niba ushaka ibikoresho byiza bya fibre itumanaho ibikoresho bya sosiyete ushobora gutekerezaibyerekeye twe.
Ibicuruzwa byitumanaho byakozwe nisosiyete ikora:
Module: moderi ya fibre optique, Ethernet, optique fibre transceiver modules, optique ya fibre optique, SSFP optique module, naSFP optique, n'ibindi.
ONUicyiciro: EPON ONU, AC ONU, fibre optique ONU, CATV ONU, GPON ONU, XPON ONU, n'ibindi.
OLTicyiciro: OLT, GPON OLT, EPON OLT, itumanahoOLT, n'ibindi.
Ibicuruzwa byavuzwe haruguru birashobora gushigikira imiyoboro itandukanye. Kubicuruzwa byavuzwe haruguru, itsinda ryumwuga kandi rikomeye R & D ryahujwe no gutanga ubufasha bwa tekinike kubakiriya, kandi itsinda ryubucuruzi ryatekereje kandi ryumwuga rirashobora gutanga serivise nziza kubakiriya hakiri karekugisha inamahanyuma nyuma.