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  TDMA in Mobile Phone Systems

Introduction to TDMA in Mobile Phone Systems

2G SYSTEMS

Several 2G cellular systems, along with the remarkable exception of IS-95, are relies on GSM, D-AMPS, TDMA, PDC, IDEN, and PHS is instances of TDMA cellular systems. GSM joins TDMA with Frequency Hopping and wideband transmission to decrease interference; this minimizes general types of interference.

In the GSM (general system for mobile phone) system, the synchronization of the mobile phones is acquired by sending timing advance commands from the base station that instructs the mobile phone to transmit previous and by how much. This compensates for the propagation delay resultant from the radio waves' light speed velocity. The mobile phone is not permitted to transmit for its complete time slot, but there is a guard interval at the end of every time slot. Like the transmission moves into the guard period, the mobile network adjusts the timing that advance to synchronize the transmission.

3G SYSTEMS

Even though most major 3G systems are mainly based upon CDMA, packet scheduling (dynamic TDMA), time division duplexing (TDD), and packet oriented multiple access schemes are presented in 3G form, combined with CDMA to get benefit of the advantages of both technologies.

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