Abstract: Hoʻopuka nui kēia blog i nā hiʻohiʻona noiʻi a me nā pono o ka ʻenehana COFDM i ka hoʻoili uila, a me nā wahi noi o ka ʻenehana.
Hua'ōlelo: non-line-of-sight;Kūʻē-keakea;E neʻe me ka wikiwiki kiʻekiʻe; COFDM
1. He aha nā ʻenehana uila uila maʻamau?
ʻO ka ʻōnaehana ʻenehana i hoʻohana ʻia i ka hoʻoili uila hiki ke hoʻokaʻawale ʻia i ka hoʻoili analog, ka hoʻouna ʻana i ka ʻikepili/lekiō pūnaewele, GSM / GPRS CDMA, digital microwave (ka hapa nui o ka spectrum microwave), WLAN (wireless network), COFDM (orthogonal frequency division multiplexing), etc. Ma waena o lākou, ʻaʻole hiki i nā ʻenehana kuʻuna ke hoʻokō i ka broadband high-speed transmission ma lalo o "blocked, non-visual and high-speed mobile condition", me ka hoʻomohala ʻana a me ke oʻo ʻana o ka ʻenehana OFDM, he hopena kēia pilikia.
2. He aha ka ʻenehana COFDM?
COFDM (coded orthogonal frequency division multiplexing), ʻo ia hoʻi, coding orthogonal frequency division multiplexing, i ka hoʻohui ʻana i ka hana hoʻoponopono hewa coding ikaika, ʻo ka hiʻohiʻona nui loa he multi-carrier modulation, ka mea e hoʻokaʻawale i kahi ala i hāʻawi ʻia i nā sub-channels orthogonal he nui. 'āina alapine (frequency domain), hoʻohana i hoʻokahi subcarrier ma kēlā me kēia sub-channel, a decomposes ke kahawai ʻikepili i loko o nā kahawai sub-data, decomposing ka kahe o ka ʻikepili, a laila hoʻohana ʻia kēia mau kahawai sub-data e hoʻololi i kēlā me kēia subcarrier kaʻawale.
ʻO ka hoʻoili like ʻana o kēlā me kēia subcarrier e hōʻemi ana i ka hilinaʻi ʻana i ka mea lawe hoʻokahi, a ʻo kona hiki anti-multipath fading hiki, anti-intercode interference (ISI), a me Doppler frequency shift resistance ua hoʻomaikaʻi nui ʻia.
Hiki i ka hoʻohana ʻana i ka ʻenehana COFDM ke ʻike maoli i ka hoʻouna ʻana i ka wikiwiki kiʻekiʻe ma lalo o ke keʻakeʻa ʻana, ʻike ʻole a me nā kūlana kelepona kiʻekiʻe, ʻo ia ka ʻenehana modulation kiʻekiʻe loa a maikaʻi loa i ka honua.
3. He aha nā mea maikaʻi o ka ʻenehana COFDM i ka hoʻouna uila?
ʻO ka hoʻouna ʻole ʻole e hele i ʻelua mau ʻanuʻu: ka hoʻoili analog a me ka lawe kikohoʻe.Ua hoʻopau maoli ʻia ka hoʻoili kiʻi analog ma nā ʻoihana he nui ma muli o kona keakea ʻana a me ka hoʻopili ʻana i ka co-channel a me ka leo superposition, e hopena i ka hopena maikaʻi ʻole i nā noi kūpono.
Me ka oʻo ʻana o ka ʻenehana OFDM a me nā ʻāpana, ua lilo nā huahana e hoʻohana ana i ka ʻenehana COFDM i ʻoi aku ka maikaʻi o nā lako uila uila.ʻO kāna mau pōmaikaʻi penei:
1、 He kūpono ia no ka noi ʻana ma nā wahi ʻaʻohe laina o ka ʻike a keakea ʻia e like me nā wahi o ke kūlanakauhale, nā wahi e pili ana, a me nā hale, a hōʻike maikaʻi loa i ka "diffraction and penetration".
Loaʻa i nā lako kiʻi uila COFDM nā pono o ka "non-line-of-sight" a me ka "diffraction" hoʻoili ma muli o kāna mau mea lawe nui a me nā ʻano ʻenehana ʻē aʻe，Ma nā kūlanakauhale, mauna, i loko a i waho o nā hale a me nā wahi ʻē aʻe i ʻike ʻole ʻia. a keakea ʻia, hiki i ka mea hana ke hoʻokō i ka hoʻoili paʻa ʻana o nā kiʻi me ke kūlana kiʻekiʻe, a ʻaʻole pili ʻia e ke kaiapuni a i ʻole ka liʻiliʻi ʻia e ke kaiapuni.
Hoʻohana pinepine ʻia nā antenna Omnidirectional ma nā ʻaoʻao ʻelua o ka transceiver a me ka mea hoʻokipa, a maʻalahi ka hoʻonohonoho ʻana o ka ʻōnaehana, hilinaʻi, a maʻalahi hoʻi.
2、 He kūpono ia no ka lawe ʻana i nā kelepona hele kiʻekiʻe, a hiki ke hoʻohana ʻia i nā kaʻa, nā moku, nā helikopter / drones a me nā pae ʻē aʻe.
ʻAʻole hiki i ka microwave kuʻuna, ka LAN uila a me nā mea ʻē aʻe ke hoʻomaopopo kūʻokoʻa i ka hoʻoili kelepona ʻana o ka hopena transceiver a hiki ke hoʻomaopopo wale i ka lawe ʻana o ka helu kelepona i kahi kikoʻī ma lalo o kekahi mau kūlana.Loaʻa i kāna ʻōnaehana nā loulou loea, ʻenehana paʻakikī, hōʻemi i ka hilinaʻi, a me ke kumu kūʻai kiʻekiʻe loa.
Eia naʻe, no nā lako COFDM,ʻaʻole ia e koi i nā mea'ē aʻe, hiki iā ia ke hoʻomaopopo i ka hoʻohanaʻana i nā keʻena paʻa-mobile, mobile-mobile-mobile, a ua kūpono loa no ka hoʻokomoʻana ma nā pūnaewele pūnaewele e like me nā kaʻa, nā moku, nā helicopter / drones, etc. ʻO ka hoʻounaʻana he hilinaʻi kiʻekiʻe a me ka hana kiʻekiʻe.
3、 He kūpono ia no ka hoʻouna ʻana i ka ʻikepili kiʻekiʻe, ʻoi aku ka nui ma mua o 4Mbps, e hālāwai me ka hoʻouna ʻana i nā wikiō a me nā leo kiʻekiʻe.
Ma waho aʻe o nā koi no nā kāmela, ʻo ka wikiō kiʻekiʻe a me ka leo he mau koi kiʻekiʻe loa no ka hoʻopā ʻana i nā kahawai a me nā kumukūʻai channel, a hiki i kēlā me kēia subcarrier o ka ʻenehana COFDM ke koho i ka QPSK, 16QAM, 64QAM a me nā modulation kiʻekiʻe kiʻekiʻe, a me ka helu kahawai synthesized. ʻoi aku ka nui ma mua o 4Mbps.No laila, hiki iā ia ke hoʻouna i ka 4: 2: 0, 4: 2: 2 a me nā codecs kiʻekiʻe kiʻekiʻe ma MPEG2, a hiki i ka hoʻonā kiʻi o ka hopena loaʻa ke hiki i 1080P, kahi e hoʻokō ai i nā koi o ka post-analysis, mālama, hoʻoponopono a me pela aku.
4、Ma nā kaiapuni electromagnetic paʻakikī, loaʻa i ka COFDM ka palekana maikaʻi loa i ke keakea.
I loko o kahi ʻōnaehana lawe hoʻokahi, hiki i ka mae ʻana a i ʻole ke keakea ʻana ke hoʻopau i ka loulou kamaʻilio holoʻokoʻa, akā i loko o kahi ʻōnaehana multicarrier COFDM, he hapa liʻiliʻi wale nō o nā subcarriers e hoʻopilikia ʻia, a hiki ke hoʻoponopono ʻia kēia mau subchannels me nā code hoʻoponopono hewa. e hōʻoia i ka haʻahaʻa haʻahaʻa hapa hapa o ka hoʻouna ʻana.
5、He kiʻekiʻe ka hoʻohana ʻana i ke kahawai.
He mea koʻikoʻi kēia i nā kaiapuni uila me nā kumuwaiwai kikoʻī liʻiliʻi, kahi e hoʻohana ai ka spectrum o ka ʻōnaehana i 2Baud/Hz ke nui ka helu o nā subcarriers.
E noi i ka ʻenehana COFDM i ka mea hoʻolele wikiō uea ʻole o IWAVE
I kēia manawa, hoʻohana nui ʻia ka COFDM ma DVB (Digital Video Broadcasting), DVB-T, DVB-S, DVB-C etc.
Me ka hoʻomohala ʻenehana, ʻoi aku ka nui o nā drones a me ka UAV e lawelawe ana no nā poʻe ma nā papahana like ʻole.Hoʻokumu ʻo IWAVE i ka hoʻolālā ʻana, hoʻomohala, a kūʻai aku i nā ʻōnaehana kamaʻilio uila no nā drones kalepa a me nā robotics.
ʻO nā hoʻonā ʻo 800Mhz, 1.4Ghz, 2.3Ghz, 2.4Ghz a me 2.5Ghz，5km-8km, 10-16km a me 20-50km wikiō a me nā loulou Bi-directional Serial Data Links me ka ʻenehana COFDM.
ʻO ka wikiwiki lele kiʻekiʻe o kā mākou kākoʻo pūnaewele ʻo 400km/h.I loko o ia wikiwiki kiʻekiʻe hiki i ka ʻōnaehana ke hōʻoia i ka hoʻoili paʻa ʻana o ka hōʻailona wikiō.
No ka pōkole 5-8km, hoʻohana ʻia ʻo OFDM no UAV/FPV a i ʻole Multi rotor wikiō hoʻoili wikiō no ka wikiō, ka hōʻailona Ethernet a me ka ʻikepili serial e like meFIP-2405aFIM-2405.
No ka lōʻihi 20-50km, paipai mākou i kēia moʻo huahana likeFIM2450aFIP2420
Hoʻohana ʻo IWAVE i ka ʻenehana COFDM kiʻekiʻe i kā mākou huahana, e kālele ana i ka hoʻomohala ʻana i ka ʻōnaehana kamaʻilio pilikia pilikia.Ma muli o 14 mau makahiki o ka ʻenehana hōʻiliʻili a me nā ʻike, alakaʻi mākou i ka localization ma o ka hilinaʻi o nā lako me ka ikaika NLOS ikaika, ka lōʻihi loa a me ka hana hana paʻa i ka UAV, robotics, nā mākeke kamaʻilio uila uila.
Manaʻo ʻia nā huahana pili
Ka manawa hoʻouna: Apr-20-2023
