TDMA definition

Time division multiple access (TDMA) is one type of multiple access method. In each user allowed to transmit only in a specified time slot with a common frequency band. It allows several users can transmit to share the same frequency band at a different time, so each using its own time slot.

TDMA

TDMA applications

TDMA is one type of multiple access method. First, let we check it out the full form of TDMA full form. In each user allowed to transmit only in a specified time slot with a common frequency band. It allows several users can transmit to share the same frequency band at a different time, so each using its own time slot. 

• TDMA used in digital cellular telecommunication.
• Satellite system.
• It is used GSM, IS-136, iDEN.
• Dynamic TDMA used for packet mode communication.
• Also, GSM uses TDMA in combination with FDMA. its a one types of advantages of TDMA
• PON network also uses for upstream traffic from premises to the operator.
• TDMA also used as telephone communication.

Efficiency of TDMA system

The efficiency of a full form of a TDMA  system is a measure of the percentage of the data that is transmitted. In this system, the transmitted data has information for providing overhead for the access scheme.

We can measure the frame efficiency of TDMA is a percentage of bits per frame that contain transmitted data.

So the number of overhead bits per frame is expressed as in this form : 

overhead  = Nr br + Nt bp + Nt bg + Nr bg 

Nr = Number of reference burst per frame

Nt = Number of  traffic burst per frame

br = Number of overhead bits per reference burst for system

bp = Number of overhead bits per preamble in each slot for system

bg = Number of an equivalent bit in each guard time interval for the system

So we have to calculate the total number of bits per frame (bT)  is :

bT  = Tf  R

Tf = Frame duration

R = Channel bit rate

The frame efficency is ( 1 - boverhead / bT ) * 100 %