Te whakawhitiwhiti matihiko ahokore: Te mātāpono mahi o te whakarerekētanga IQ

Te whakawhitiwhiti kōrero matihiko ahokore: Te mātāpono mahi oTe whakarerekētanga IQ
Ko te whakarerekētanga IQ te tūāpapa o ngā tikanga whakarerekētanga taumata-teitei e whakamahia whānuitia ana i roto i ngā mara LTE me te WiFi, pērā i te BPSK, QPSK, QAM16, QAM64, QAM256, me ētahi atu. He mea nui te mārama ki te kaupapa mahi o te whakarerekētanga IQ kia pai ake ai te mārama ki te tikanga whakatinanatanga OFDM i roto i te LTE me te WiFi. Nā te mea ko ngā tikanga whakarerekētanga e whakamahia ana i runga i ia kawe iti o te OFDM he momo tikanga whakarerekētanga QAM tonu e ahu mai ana i te whakarerekētanga IQ, ā, ko te whakatinanatanga o te OFDM ko te taupatupatu o te whakarerekētanga IQ i runga i ngā kawe iti orthogonal maha.
Ko ngā ariā o I me Q i roto i te IQ modulation e rite ana ki ngā whakarāpopototanga o ngā kupu Pākehā e rua: In Phase me Quadrature. Mai i te tikanga tuturu, kāore he tikanga o ngā ingoa o ngā tohu I me Q. He aha te in-phase? He aha te orthogonality? He aha te tohu e whakamahia ana hei tohutoro hei whakatau i te in-wāhangame te tapawhā? I roto i te whakatinanatanga mahi, he huinga ngaru cosine me sine o te auau kotahi e whakamahia whānuitia ana hei tohu I me Q. Nō reira, ko te tohu cosine e whakamahia ana hei tohu I ko te tohu tohutoro, he tohu In Phase tonu. Ko te tohu cosine e 90 nekehanga te tawhiti atu i te āhua me te tohu I ko tōna tohu Tapawhā. Nō reira, ko te māramatanga māmā rawa atu ki ngā tohu whakarerekētanga IQ ko te whakaaro ki te tohu I hei tohu kawe cosine, me te tohu Q hei tohu kawe sine me te rerekētanga auau o te 90 nekehanga mai i te tohu I.

Ko te mea e kiia nei ko te whakarerekētanga IQ he whakamahi i tētahi huinga tohu I, arā, ko ngā tohu cosine, me ngā tohu Q, arā, ko ngā tohu sine (me te rerekētanga ā-wāhanga o te 90 nekehanga me te orthogonal tetahi ki tetahi) o te auau rite ki ngā kaikawe, hei whakarerekē i ngā tohu turanga e rua ki ngā kaikawe e rua i te wā kotahi, kātahi ka tāpirihia ngā tohu whakarerekētanga e rua ka tukuna mā te ara iahiko RF. I muri i te whiwhinga i te tohu auau reo irirangi, ka mahi te pito whiwhiTe whakahekenga IQI te wā o te tangohanga IQ, nā te mea he tūhonohono ngā kaikawe e rua tetahi ki tetahi, ka taea te wehe i ngā tohu turanga e rua mai i te tohu whakauru i runga i ngā tohu kaikawe I me Q i whakamahia i roto i te tukanga whakarerekētanga o mua, ā, ka taea te tangohanga motuhake. Mō ngā tohu I me Q i whakarerekētia e IQ, ko te whakanui ake i te kaha o te taha kotahi ehara i te mea ka whakanui noa i te kaha o te tohu whakarerekētia, engari ka meinga hoki te nekehanga o te wāhanga o te tohu whakarerekētia ki te taha me te kaha kua piki ake. Nō reira, ko te whakarerekētanga IQ he whakarerekētanga kaha e mahia ana i runga i te tohu I me te tohu Q, engari ko te hua whakarerekētanga ehara i te mea ka pā ki te kaha o te tohu whakarerekētia anake, engari ki tōna huringa wāhanga hoki. Koinei te kaupapa mahi taketake o te whakarerekētanga me te tangohanga IQ.