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MSK-GMSK
Paj sa a dekri teknik modulation modulasyon MSK (Minimale Shift Keying) ak GMSK (Gaussian Shift Minimum Shing). Li kouvri GMSK modulateur ak GMSK demodulator ki baze sou metòd QPSK batman.
MSK modulasyon
GMSK se derive nan konplo MSK batman ak MSK se sòti nan konpansasyon QPSK batman. Nan MSK konplo batman olye pou yo rektangilè vag batman kè; mwatye sik vag ons se itilize. Frekans nan zewo lojik ak yon sèl ki lojik diferan pa mwatye nan to done. Endèks modilasyon se 0.5 isit la. Ekran matematik MSK batman an endike anba a.
Se MSK ond batman montre anba a nan figi pou NRZ siyal done.
GMSK modulation
Gaussian Shift minim keying oswa GMSK konplo batman yo itilize nan GSM / CDPD (Cellular Digital Done Pake) teknoloji. Gen de metòd prensipal pou jenere GMSK. Premye a se FSK modulasyon ak yon sèl nan dezyèm se QPSK batman. Premye a se ki baze sou GMSK VCO achitekti ak se pa ideyal pou demodulateur aderan. Nou pral diskite sou dezyèm kalite yo itilize nan GSM montre nan figi 3 ak 4 anba a. Figi 3 mansyone GMSK modulateur ak figi 4 mansyone GMSK demodulator.
Jan yo montre nan GMSK a modulateur Gaussian filtre aplike nan NRZ siyal apre li fin pase nan blòk entegre. Sa bay. Pa aplike COS ak SIN fonksyon sa a out bay soti mwen ak K konpozan ki Bits ak cos ak peche fonksyon respektivman lè l sèvi avèk fonksyon melanje. Tou de chenn yo yo adisyone leve, li pral bay soti S (n). Se menm pwosesis la konprann byen pa ekwasyon trigonometrik mansyone nan Fig.3.
Menm jan yo montre nan fig.4 GMSK modulateur fondamantalman tire tounen arc lè l sèvi avèk arctan fonksyon, ki se aplike nan blòk derator jwenn NRZ siyal tounen. Anvan yo fè sa a melanje ak Low pase filtraj se fè jwenn I ak eleman Q soti nan de chenn. Menm a se byen konprann pa ekwasyon trigonometrik mansyone nan fig frans. 4.
Efikasite bandwidth pou MSK ak GMSK se 1 ti jan / s / Hz ke yo rele tou efikasite espèk. Figi 5 ki anba a pentire ond MSK, GMSK.
Avantaj- Konpayi ki modifye nan MSK pa gen okenn diskontinwans faz ak chanjman frekans rive nan travèse zewo nan konpayi asirans. Sa a ede nan kenbe PAPR ba kidonk pa mande pou trè lineyè pouvwa anplifikatè. GMSK espèk efikasite se pi bon pase MSK jan yo montre nan figi 5. Epitou li gen rezonab mwens konpleksite demodulator.
Si ou vle achte nenpòt euipments FM / TV pou difize, tanpri ou lib pou kontakte nou pa Imèl: [imèl pwoteje].?