Kutaurirana kwedhijitari kusina waya: Nheyo yekushanda kweIQ modulation

Kutaurirana kwedhijitari kusina waya: Musimboti wekushandaKuchinja kweIQ
Kuchinja kweIQ ndiyo hwaro hwenzira dzakasiyana-siyana dzekuchinja dzemhando yepamusoro dzinoshandiswa zvakanyanya muminda yeLTE neWiFi, dzakadai seBPSK, QPSK, QAM16, QAM64, QAM256, nezvimwewo. Kunzwisisa musimboti wekushanda kweIQ modulation kwakakosha kuti unzwisise zviri nani nzira yekutanga yeOFDM muLTE neWiFi. Nekuti nzira dzekushandura dzinoshandiswa pane imwe neimwe subcarrier yeOFDM dzichiri nzira dzakasiyana dzekugadzirisa QAM dzakavakirwa paIQ modulation, uye zvakanyanya, kushandisa OFDM ndiko kusanganisa kweIQ modulation pane dzakawanda orthogonal subcarriers.
Pfungwa dzeI naQ muIQ modulation dzinoenderana nechidimbu chemazwi maviri eChirungu: MuPhase neQuadrature, zvichiteerana. Kungotaura kubva pane zvinoreva chaizvo, mazita ezviratidzo zveI naQ haana zvaanoreva. Chii chinonzi in-phase? Chii chinonzi orthogonality? Chii chinoshandiswa sechiratidzo chekutarisa mu-chikamuuye quadrature? Mukuita basa, seti yemafungu ecosine nesine ane frequency imwechete anowanzo shandiswa sezviratidzo zveI neQ. Saka, chiratidzo checosine chinoshandiswa sechiratidzo cheI ndicho chiratidzo chereferensi, icho chiri chiratidzo cheIn Phase. Chiratidzo checosine chiri 90 degrees kunze kwechikamu nechiratidzo cheI zvakasikwa chiratidzo chayo cheQuadrature. Saka kunzwisisa kuri nyore kweIQ modulation signals ndekufunga nezvechiratidzo cheI sechiratidzo checosine carrier, uye chiratidzo cheQ sechiratidzo chesine carrier chine musiyano wefrequency we90 degrees kubva kuchiratidzo cheI.

Kushandiswa kweIQ modulation kunosanganisira kushandisa seti yezviratidzo zveI, zvinoti zviratidzo zvecosine, uye zviratidzo zveQ, zvinoti zviratidzo zvesine (zvine musiyano wechikamu che90 degrees uye orthogonal kune mumwe nemumwe) zvefrequency yakafanana neyevatakuri, kugadzirisa panguva imwe chete zviratidzo zviviri zvebaseband kune vatakuri vaviri, uye wobva waisa zviratidzo zviviri zvakagadziriswa pamwe chete wozvitumira kuburikidza neRF circuit. Mushure mekugamuchira chiratidzo cheredhiyo, chikamu chinogamuchira chinoita basa.Kuderedza IQ. Munguva yekubvisa chiratidzo cheIQ, nekuti zvinhu zviviri izvi zvinofamba zvakatenderedzana, zviratidzo zviviri zvebaseband zvinogona kuparadzaniswa kubva kuchiratidzo chakasanganiswa zvichibva pazviratidzo zveI neQ zvakashandiswa mukuita kwekuchinja kwezwi kare uye zvinobviswa zvakasiyana. Kune zviratidzo zveI neQ zvakagadziriswa neIQ, kuwedzera amplitude yerutivi rumwe hakungowedzera amplitude yechiratidzo chakagadziriswa chete, asiwo kunoita kuti chikamu chechiratidzo chakagadziriswa chiende kudivi nekuwedzera amplitude. Saka, IQ modulation i amplitude modulation inoitwa pachiratidzo cheI nechiratidzo cheQ, asi mhedzisiro yekuchinja haingokanganisi amplitude yechiratidzo chakagadziriswa chete, asiwo kuchinja kwechikamu chayo. Iyi ndiyo nheyo yekushanda kweIQ modulation uye demodulation.