1. BANGALORE INSTITUTE OF TECHNOLOGY
K.R.ROAD ,V.V PURA , BANGALORE-560004
DEPARTMENT OF ELECTRONICS AND TELECOMMUNICATION
ENGINEERING
SUBJECT:WIRELESS COMMUNICATION LAB
Guided By : Prof. Shruthi N
Presented By: Prakruthi D S
TOPIC: Time division multiplexing
4. TDMA is digital transmission technology that allows a number of users
to access a single radio frequency channel without interference by
allocating unique time slots to each user within each channel.
TDMA divides each cellular channel into three time slots in order to
increase the amount of data that can be carried.
The reason for choosing TDMA for all standards was that it enables
some vital features for system operation in an advanced cellular or PCS
environment.
TDMA relies upon the fact that the audio signal has been digitized i.e
divided into a number of millisecond long packets. It allocates a single
frequency channel for a short time and then moves to another channel.
5. Efficiency of TDMA
• Calculation of efficiency becomes trivial as TDMA uses high overhead
than compared to FDMA.
• The efficiency of TDMA system is a measure of the percentage of
transmitted data that contains information as opposed to providing
overhead for the scheme.
6. Number of channels in TDMA systems
• The number of TDMA channel slots that can be provided in a
TDMA system is found by multiplying the number of TDMA
slots per channel by the number of channels available.
7. Advantages:
• TDMA can undoubtedly adjust to the transmission of information just as voice
correspondence.
• It can convey 64 kbps to 120 Mbps of information rates.
• TDMA permits the administrator to do administrations like fax, voiceband
information, SMS just as applications, for example, mixed media and video
conferencing.
• TDMA offers significant investment funds in base-station hardware, space, and
support, a significant factor as cell sizes become ever more modest.
• Double band 800/1900 MHz.
8. Disadvantages:
• In TDMA every client makes some predefined memories space so clients
wandering starting with one cell then onto the next are not distributed a scheduled
opening. In this manner, if all the time allotments in the following cell are now
involved, a cell likely could be disengaged. Similarly, if all the time allotments in
the cell in which a client turns out to be in are now involved, a client won’t get a
dial tone.
• It is exposed to multipath twisting. A sign coming from a pinnacle and get to
handset may come from any of a few headings so out and about sign ricocheted
off a few distinct structures prior to showing up which can cause impedance.
• Organization and range arranging is concentrated.
