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  TDMA Transmission

Introduction to TDMA (Time division multiple access) Transmission:

Time division multiple access (TDMA) is a channel access technique for shared medium networks. TDMA permits various users to share similar frequency channel by dividing the signal into dissimilar time slots. The users transmit in fast succession, one after another, every one using his own time slot. This permits several stations to share similar transmission medium (for example radio frequency channel) when using only a part of its channel capacity. TDMA is employed in the digital 2G cellular systems like Personal Digital Cellular (PDC), Global System for Mobile Communications (GSM), IS-136, and iDEN, and in the Digital improved Cordless.

Telecommunication (DECT) standard for portable phones. It is as well employed extensively in satellite systems, and combat-net radio systems.

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Figure: Usage of dynamic TDMA packet mode communication

TDMA (Time division multiple access) frame structure depicting a data stream split into frames and those frames separated into time slots.

TDMA CHARACTERISTICS:

1. TDMA Shares single carrier frequency with several users.

2. Non-continuous transmission creates handoff simpler.

3. Slots can be allotted on demand in dynamic TDMA

4. Less stringent power control than CDMA because of decreased intra cell interference

5. Greater synchronization overhead than CDMA

6. Cell breathing is more complicated than in CDMA

7. Frequency or slot allocation complexity

8. Pulsating power envelop: Interference along with other devices.

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