gsm原理介紹(英文版)(參考版)
2025-03-01 00:48本頁面
【正文】 NOKIA Agenda . GSM900/DCS1800 . The GSM Network Air Interface . Technical Basics . Speech Coding . Types of Channel . Making a Phone Call NOKIA Global System for Mobile ( Groupe Special Mobile ) G S M NOKIA 1982 Groupe Special Mobile?is created within CEPT 1986 A Permanent Nucleus is set up 1987 Main radio transmission techniques are chosen, based on prototype evalution (1986) 1989 GSM bees an ETSI technical mitte 1990 The phase 1 GSM 900 specifications are finalized 1991 First systems are running 1992 All major European GSM 900 operators begin mercial operator GSM Development History NOKIA ? Speech Services ? Data Services ? Short Message Services (SMS) ? Supplementary Services ? Subscriber Identity Module (SIM) ? Security Function GSM / DCS1800 Functionalities NOKIA RF Aspects ? TDMA ? Modulation ? Burst Power Transmission ? Neighbour Cells Measurement ? Hopping ? Uplink / Downlink DTx ? BER Receiver Testing NOKIA G S M 9 0 0 G S M 9 0 0 D C S 1 8 0 0 D C S 1 8 0 0 P C S 1 9 0 0U p l i n k 8 9 0 t o 8 8 0 t o 1 7 1 0 t o 1 7 1 0 t o 1 8 5 0 t o9 1 5 M H z 9 1 5 M H z 1 7 8 5 M H z 1 7 8 5 M H z 1 9 1 0 M H zD o w n l i n k 9 3 5 t o 9 2 5 t o 1 8 0 5 t o 1 8 0 5 t o 1 9 3 0 t o9 6 0 M H z 9 6 0 M H z 1 8 8 0 M H z 1 8 8 0 M H z 1 9 9 0 M H zA R F C N r a n g e 1 t o 1 2 4 0 t o 1 2 4 a n d 5 1 2 t o 8 8 5 5 1 2 t o 8 8 5 5 1 2 t o 8 1 09 7 5 t o 1 0 2 3T X / R X S p a c i n g 4 5 M H z 4 5 M H z 9 5 M H z 9 5 M H z 8 0 M H z( F r e q . )T X / R X S p a c i n g 3 T i m e s l o t s( T i m e )M o d u l a t i o n D a t a 2 7 0 . 8 3 3 k b i t / sR a t eF r a m e P e r i o d 4 . 6 1 5 m sT i m e s l o t P e r i o d 5 7 6 . 9 u sB i t P e r i o d 3
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