Ọtụtụ ndị ahịa na-ajụ mgbe ị na-ahọrọ aihe mgbasa ozi vidiyo dị egwu- kedu ihe dị iche n'etitiCOFDM ikuku vidiyo na-ebufena OFDM video transmitter?
COFDM bụ koodu OFDM, Na blọọgụ a anyị ga-atụle ya iji nyere gị aka ịchọpụta nhọrọ ga-aka mma ngwa gị.
1. OFDM
Teknụzụ OFDM na-ekewa ọwa enyere n'ime ọtụtụ ọwa ọwa orthogonal na ngalaba ugboro.A na-eji otu ụgbọ ala na-eme mgbanwe na chanel ọ bụla, a na-ebufe ụgbọ ala nke ọ bụla n'otu oge.N'ụzọ dị otú a, ọ bụ ezie na n'ozuzu ọwa adịghị ewepụghị na ugboro ole nhọrọ.Mana ọwa subchannel ọ bụla dị larịị.A na-eme mgbasa ozi narrowband na mpaghara ọwa nke ọ bụla, na bandwidth mgbaàmà dị ntakịrị karịa bandwit kwekọrọ na ọwa.Ya mere, nnyonye anya n'etiti mgbama ebili mmiri nwere ike ikpochapụ nke ukwuu.
Ebe ọ bụ na ndị na-ebu sub-channel ọ bụla bụ orthogonal na ibe ha na usoro OFDM.Ụdịdị dị iche iche ha na-ejikọta ibe ha.Ọ bụghị naanị na nke a na-ebelata nnyonye anya n'etiti ndị na-ebu ụgbọ ala, kamakwa ọ na-akwalite iji ụdịdị dị iche iche.
2. COFDM
COFDMis Usoro nkewa ugboro ugboro nke Orthogonal Multiplexing, nke pụtara
tupu modulation OFDM, a na-etinye koodu iyi dijitalụ.
Kedu ihe koodu a na-eme?Ọ bụ koodu nzuzo (ntụgharị isi mmalite bụ iji dozie nsogbu nke arụmọrụ, yana koodu ntinye ọwa bụ iji hụ na ntụkwasị obi nke nnyefe).
Usoro a kapịrị ọnụ bụ:
2.1.Mmezi mperi n'ihu(FEC)
Dịka ọmụmaatụ, 100 bit nke data kwesịrị ịgbanwemakanyefeeing.Mbụ gbanwee ya ka ọ bụrụ 200 bits,.Mgbe anabatara mgbaàmà, ọbụlagodi na enwere nsogbu na nnyefe nke 100 bits, data ziri ezi ka nwere ike imebi.Na nkenke, ọ bụ ịgbakwunye redundancy tupu modulation iji melite ntụkwasị obi nke nnyefe.A na-akpọ nke a mmezi njehie ime (FEC) na sistemụ COFDM.Na mt bụ ihe dị mkpa nke usoro COFDM.
2.2.Oge nche
Fma ọ bụ nzube nke solvingmulti-nsogbu ụzọya bumgbama a na-ebunye na-erute njedebe nnata site na ọtụtụ ụzọ nnyefe. Aetinyere oge nche n'etiti ibe n'ibe data ebutere.
3.Mkpebi
Ọdịiche dị n'etiti COFDM na OFDM bụ na a na-agbakwunye koodu mgbazi mperi na oge nche tupu ngbanwe nke orthogonal iji mee ka mgbasa ozi dị irè karị.
OFDM na-edozi ọwa nhọrọ na-ada ada n'ọtụtụ-gburugburu ụzọ nke ọma, ma ọ kabeghị imeri ọwa flat na-ada ada.
COFDM na-enyere mbelata akara koodu nkeji ọ bụla n'oge mgbasa ozi ka a na-ewere ya dị ka onye nweere onwe ya site na itinye koodu, si otú ahụ na-ewepụ mmetụta nke ịla n'iyi na ngbanwe ugboro Doppler.
4.Ngwa nke OFDM na COFDM
COFDM dị mma maka nnyefe ikuku n'ogeoke ọsọna-akpụ akpụ.Dị ka Hd wenweghị umetonye mgbapụtavehilemihe, ụgbọ mmirintupu nkwurịta okwu, helikoptaCofdm Hd nnyefe nalọngriwedronevechichetonye mgbapụta.
COFDM nwekwara ike nlos ike.Ọ dabara maka itinye n'ọrụ na gburugburu ndị na-adịghị ahụ anya na ihe mgbochi dị ka obodo mepere emepe, ala ịta ahịhịa, na ụlọ, ma gosipụta ike "iche" na "penetration" magburu onwe ya.
OFDM na-enyere aka iji ụdịdị dị elu rụọ ọrụ nke ọma yana ọ nwere ike iguzogide ọdịda nhọrọ ugboro ole, nke a na-eji mgbe niile na netwọkụ LTE na wifi.
Oge nzipu: Jun-12-2023
