Nkwukọrịta dijitalụ ikuku ikuku: ụkpụrụ na-arụ ọrụ nke modulation IQ

Ikuku dijitalụ nkwurịta okwu: Arụ ọrụ ụkpụrụ nkeMgbanwe IQ
IQ modulation bụ ntọala nke usoro mgbanwe dị elu dị iche iche a na-ejikarị na mpaghara LTE na WiFi, dị ka BPSK, QPSK, QAM16, QAM64, QAM256, wdg Ịghọta ụkpụrụ ọrụ nke IQ modulation dị mkpa maka nghọta ka mma nke usoro mmejuputa OFDM dị na LTE na WiFi. N'ihi na usoro modulation eji na onye ọ bụla subcarrier OFDM ka bụ dị iche iche QAM modulation usoro dabere na IQ modulation, na n'ezie, mmejuputa iwu nke OFDM bụ superposition nke IQ modulation on multiple orthogonal subcarriers.
Echiche nke I na Q na IQ modulation kwekọrọ na mbiri nke okwu bekee abụọ: Na Phase na Quadrature, otu. N'ikwu okwu naanị site na nkọwa nkịtị, aha akara I na Q enweghị ihe ọ pụtara. Gịnị bụ na-phase? Gịnị bụ orthogonality? Kedu mgbama a na-eji dị ka ihe ntụnye aka iji chọpụta n'ime-usorona quadrature? Na mmejuputa a na-arụ ọrụ, a na-ejikarị usoro nke cosine na ebili mmiri sine nke otu ugboro dị ka akara I na Q. Ya mere, akara ngosi cosine eji dị ka akara m bụ n'ezie akara ngosi, nke bụ n'ezie mgbama In Phase. Ihe mgbaàmà cosine nke dị ogo 90 site na nkeji yana akara I bụ akara ngosi Quadrature ya. Ya mere, nghọta kachasị mfe nke mgbama mgbanwe mgbanwe IQ bụ ịtụle akara ngosi I dị ka akara ngosi cosine, yana Q mgbaàmà dị ka akara sine nke nwere ọdịiche ugboro ugboro nke ogo 90 site na akara I.

Ihe a na-akpọ IQ modulation bụ iji akara ngosi nke I, ya bụ akara cosine, na akara Q, ya bụ akara sine (nke dị iche na 90 degrees na orthogonal na ibe ha) nke otu ugboro dị ka ndị na-ebu, iji gbanwee akara abụọ baseband na ndị na-ebu abụọ ahụ, wee na-ebufe ha abụọ na-ebufe ha site na mgbama RF. Mgbe ị nwetasịrị mgbama ugboro redio, njedebe nnata na-arụ ọrụMgbanwe nke IQ. N'oge demodulation IQ, n'ihi na ndị na-ebu abụọ ahụ bụ orthogonal na ibe ha, enwere ike ikewapụ akara ngosi baseband abụọ na mgbaàmà agwakọtara na-adabere na akara I na Q nke ejiri mee ihe na usoro modulation gara aga ma gbanwee iche. N'ihi na ma I na Q mgbaàmà modulated site IQ, ịba ụba ikwu njupụta nke otu akụkụ ọ bụghị nanị na-eme ka njupụta nke mgbaama modulated, ma na-eme ka na-adọ nke modulated mgbama ka ịgbanwee kwupụta n'akụkụ na ụba amplitude. Ya mere, n'ụzọ bụ isi, IQ modulation bụ njupụta modulation emere na akara I na akara Q, mana nsonaazụ mgbanwe ọ bụghị naanị na-emetụta njupụta nke mgbaama modulated, kamakwa mgbanwe oge ya. Nke a bụ isi ụkpụrụ ọrụ nke IQ modulation na demodulation.