Abstract: Blọọgụ a na-ewebata njirimara ngwa yana uru teknụzụ COFDM na nnyefe ikuku, yana mpaghara ngwa nke teknụzụ.
Keywords: na-abụghị ahịrị-nke-anya;Mgbochi nnyonye anya;Bugharịa na oke ọsọ; COFDM
1. Kedu ihe bụ teknụzụ mgbasa ozi ikuku nkịtị?
Enwere ike kewaa sistemụ teknụzụ ejiri na nnyefe ikuku na-ekewa n'ime nnyefe analọgụ, nnyefe data / redio ịntanetị, GSM / GPRS CDMA, igwe onyonyo dijitalụ (nke na-agbasakarị ngwa ngwa ngwa ngwa), WLAN (netwọk ikuku ikuku), COFDM (orthogonal ugboro nkewa multiplexing), wdg. N'ime ha, teknụzụ ọdịnala enweghị ike nweta mgbasa ozi dị elu nke brọdband n'okpuru "ọnọdụ ekwentị egbochighị, nke na-adịghị ahụ anya na nke dị elu", na mmepe na ntozu nke teknụzụ OFDM, nsogbu a nwere ihe ngwọta.
2. Gịnị bụ nkà na ụzụ COFDM?
COFDM (coded orthogonal ugboro nkewa multiplexing), ya bụ, itinye koodu orthogonal ugboro nkewa multiplexing, na mgbakwunye na ọrụ mgbazi koodu dị ike, akụkụ kachasị ukwuu bụ modulation multi-carrier, nke na-ekewa ọwa nyere n'ime ọtụtụ ọwa orthogonal na mpaghara. ugboro ugboro, na-eji otu subcarrier na nke ọ bụla sub-channel, na decompose data iyi n'ime ọtụtụ sub-data iyi, decomposing data eruba ọsọ, ndị a sub-data iyi na-eji medulate ọ bụla subcarrier iche iche.
Nzikọrịta nke ọdụ ụgbọ ala nke ọ bụla na-ebelata ịdabere na otu onye na-ebu ya, yana ikike ya na-egbochi multipath, ikike mgbochi intercode (ISI), na nguzogide mgbanwe Doppler na-abawanye nke ọma.
Ojiji nke teknụzụ COFDM nwere ike ghọta n'ezie mgbasa ozi brọdband dị elu n'okpuru mgbochi, ọnọdụ ekwentị na-adịghị ahụ anya na nke dị elu, nke bụ ugbu a teknụzụ modulation kachasị elu na nke na-ekwe nkwa n'ụwa.
3. Kedu uru dị na teknụzụ COFDM na nnyefe ikuku?
Nfefe ikuku na-agafe usoro abụọ: nnyefe analọgụ na dijitalụ.A kpochapụrụ nnyefe ihe oyiyi Analog n'ụzọ zuru ezu n'ọtụtụ ụlọ ọrụ n'ihi nnyonye anya ya na nnyonye anya co-channel na nnukwu mkpọtụ mkpọtụ, na-ebute mmetụta na-adịghị mma na ngwa bara uru.
Site na ntozu oke nke teknụzụ OFDM na akụrụngwa, ngwaahịa ndị na-eji teknụzụ COFDM abụrụla akụrụngwa mgbasa ozi ikuku kachasị elu.Uru ya bụ ndị a:
1, Ọ bụ adabara ngwa na Ọ dịghị-akara-nke-anya na obstructed gburugburu dị ka obodo mepere emepe, ala ịta ahịhịa, na ụlọ, na-egosi magburu onwe "diffraction na penetration" ike.
COFDM wireless image akụrụngwa nwere uru nke "na-abụghị akara nke anya" na "diffraction" nnyefe n'ihi na ya multi-ebu na ndị ọzọ na nkà na ụzụ àgwà, N'obodo mepere emepe, ugwu, n'ime na n'èzí ụlọ na ndị ọzọ gburugburu na-apụghị ịhụ. na ihe mgbochi, ngwaọrụ ahụ nwere ike nweta nnyefe kwụsiri ike nke ihe oyiyi nwere nnukwu ohere, na gburugburu ebe obibi emetụtaghị ya ma ọ bụ na-emetụta ya.
A na-ejikarị antennas omnidirectional eme ihe na nsọtụ abụọ nke transceiver na nnata, na ntinye usoro dị mfe, ntụkwasị obi na mgbanwe.
2, Ọ bụ adabara elu-ọsọ mobile nnyefe, na ike tinye n'ọrụ ụgbọ ala, ụgbọ mmiri, helikopta / drones na ndị ọzọ nyiwe.
Ngwa ngwa ngwa ọdịnala ọdịnala, LAN ikuku na ngwaọrụ ndị ọzọ enweghị ike ịghọta n'onwe ya na nnyefe mkpanaka nke njedebe transceiver ma nwee ike ghọta na nnyefe nke ebe mkpanaka gaa na ebe edobere n'okpuru ọnọdụ ụfọdụ.Usoro ya nwere ọtụtụ njikọ teknụzụ, injinia dị mgbagwoju anya, ntụkwasị obi belatara, yana ọnụ ahịa dị oke oke.
Otú ọ dị, maka ngwá ọrụ COFDM, ọ dịghị achọ ihe ọ bụla ọzọ ngwaọrụ, ọ nwere ike ịghọta na-eji nke ofu-mobile, mobile-mobile ọnụ ụlọ, na dị nnọọ mma maka echichi na mobile nyiwe dị ka ụgbọ ala, ụgbọ mmiri, helikopta / drones, wdg. Nbufe ahụ nwere ntụkwasị obi dị elu na arụmọrụ dị elu.
3, Ọ bụ adabara elu-ọsọ data nnyefe, n'ozuzu ukwuu karịa 4Mbps, izute nnyefe nke elu-edu video na ọdịyo.
Na mgbakwunye na ihe ndị a chọrọ maka igwefoto, vidiyo na ọdịyo dị elu nwere nnukwu ihe achọrọ maka itinye koodu iyi na ọnụego ọwa, na onye ọ bụla na-ebufe teknụzụ COFDM nwere ike ịhọrọ QPSK, 16QAM, 64QAM na mgbanwe ndị ọzọ dị elu na-agba ọsọ, yana ọnụego ọwa ahazi. na-adịkarị karịa 4Mbps.Ya mere, ọ nwere ike ịnyefe 4: 2: 0, 4: 2: 2 na codecs ndị ọzọ dị elu na MPEG2, na mkpebi oyiyi nke njedebe nnata nwere ike iru 1080P, nke na-ezute ihe ndị a chọrọ nke nyocha post-analysis, nchekwa, edezi na ya mere na.
4, Na mgbagwoju electromagnetic gburugburu, COFDM nwere magburu onwe mgbochi nnyonye anya.
N'ime usoro ihe na-ebu otu, otu nkwụsị ma ọ bụ nnyonye anya nwere ike ime ka njikọ nkwurịta okwu dum daa, ma n'ime usoro COFDM multicarrier, ọ bụ naanị obere pasent nke ndị na-ebu ụgbọ ala na-egbochi, na subchannels ndị a nwekwara ike dozie ya na koodu ndị na-edozi njehie. iji hụ na ọnụego nnyefe dị ala dị ala.
5, chanel itinye n'ọrụ dị elu.
Nke a dị mkpa karịsịa na gburugburu ikuku ikuku nwere oke ụdịdị dị iche iche, ebe ojiji nke sistemụ na-eme ka ọ bụrụ 2Baud / Hz mgbe ọnụ ọgụgụ ndị na-ebu ụgbọ ala buru ibu.
Tinye teknụzụ COFDM na mgbasa ozi vidiyo ikuku nke IWAVE
Ugbu a COFDM na-eji ọtụtụ ebe na DVB (Digital Video Broadcasting), DVB-T, DVB-S, DVB-C wdg maka elu-ọsọ UAV data nnyefe.
Site na mmepe teknụzụ, enwere ọtụtụ drones na UAV na-ejere ndị mmadụ ozi na ọrụ dị iche iche.IWAVE lekwasịrị anya n'ichepụta, ịzụlite na ire ngwọta nkwukọrịta ikuku maka drones azụmahịa na robotics.
Ihe ngwọta bụ 800Mhz, 1.4Ghz, 2.3Ghz, 2.4Ghz na 2.5Ghz, 5km-8km, 10-16km na 20-50km video na dijitalụ Bi-directional Serial Data Links na COFDM technology.
Ọsọ kacha elu na-akwado sistemụ anyị bụ 400km / h.N'oge oke ọsọ dị otú ahụ, sistemụ ahụ nwekwara ike hụ na mgbasa ozi vidiyo kwụsiri ike.
Maka obere nso 5-8km, a na-eji OFDM maka nnyefe vidiyo UAV/FPV ma ọ bụ Multi rotor maka vidiyo, akara Ethernet na data serial dị ka.FIP-2405naFIM-2405.
Maka ogologo nso 20-50km, anyị na-akwado ngwaahịa usoro a dị kaFIM2450naFIP2420
IWAVE's nakweere teknụzụ COFDM dị elu na ngwaahịa anyị, gbado anya n'ịzụlite usoro nzikọrịta ozi mberede ngwa ngwa.Dabere na afọ 14 nke teknụzụ gbakọtara na ahụmịhe, anyị na-eduga mpaghara site na ntụkwasị obi nke akụrụngwa nwere ikike NLOS siri ike, ogologo ogologo ogologo na arụmọrụ kwụsiri ike na UAV, robotics, ahịa nkwukọrịta ikuku ikuku.
Nkwanye ngwaahịa ndị emetụtara
Oge nzipu: Eprel-20-2023