What is the difference between TDMA and CDMA?

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Let us understand what Time Division Multiple Access (TDMA) is.


TDMA represents Time Division Multiple Access. It is a cellular mobile technology that depends on time-division multiplexing (TDM) techniques. In TDM, each sender is provided the whole possession of the whole bandwidth of the medium for a constant duration of time. After this, the control is transferred to the next sender, and the process carries on a round-robin basis.

An example of TDM is the television broadcast. In a television serial, generally, a 10 minutes serial is followed by a 5 minutes advertisement. The time in which the serial is being broadcasted; accordingly, the total frequency is dedicated to the serial.

Types of TDMA

There are two types of TDMA which are as follows −

  • Synchronous TDM − Synchronous TDM is known as synchronous. It is essential because each time slot is pre-assigned to a constant source. The time slots are transmitted regardless of whether the sources have a few data to send or not. TDM devices can handle the source of multiple data costs. This is completed by authorizing fewer slots per cycle to the passive input devices than the rapid device.

  • Statistical TDM: −Statistical TDM is also known as Asynchronous TDM. ATDM has been created to solve the issue of misuse of the multiplexed channels in synchronous TDM. The limitation of the TDM approach is that various time slots in the frame are wasted. A particular terminal has no data to send to a specific instant of time and will send an unfilled time slot. It is also known as asynchronous TDM or intelligent TDM.


CDMA stands for Code Division Multiple Access. It is a channel access approach used by various radio communication technologies. It is a digital mobile technology and an instance of multiple accesses. It is frequently used for mobile communication.

Multiple access defines that multiple transmitters can send data at the same time over an individual communication channel. In this system, there are several CDMA codes that are authorized to multiple users, and the user can access the whole bandwidth for the entire duration. It is used to develop the use of available bandwidth as it sends over the entire frequency range and does not describe the user's frequency range.

Therefore, CDMA enables multiple users to send a band of frequencies without undue interference among the users. It is used as access techniques in some cellular phone standards.

It depends on the spread spectrum technology and creates excellent use of the available bandwidth. Since it uses the spread spectrum technology, it allows each user to transmit the data over the entire frequency spectrum at any time.

Published on 19-Nov-2021 07:01:51