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  • Category: Networking Questions

    What is TDMA & FDMA in 4G Network?


    Are you keen to know what is TDMA & FDMA in 4G Network? Ask our technical experts to know in details.

    The telecom operators have launched 4G services across India. Few operators rolled out 4G services under TDMA technology and few are launched under FDMA technology.

    What is the difference between TDMA & FDMA in case of 4G networks? And what are the merits and demerits of TDMA & FDMA.
  • #12581
    TDMA and FDMA form part of the telecom technology. I am trying to put the ideas in a simple language here -

    FDMA
    FDMA stand for Frequency Division Multiple Access. In this, the total bandwidth available is divided into multiple frequencies. It finds usage in analog communication. Though it can handle digital transmission, it may not be that much effective means in that direction. This technology will have only one user at a particular time on one channel. All the information will be contained in a single channel.

    TDMA
    This is an acronym for Time Division Multiple Access. The transmission happens on a single digital channel. The calls are digitised and then sent on a single channel. TDMA will let three users occupy a single channel at the same time. They will be using it in quick succession that will be unnoticeable.

    Live....and Let Live!

  • #12596
    TDMA and FDMA are one of the resource sharing implementations in the telecom network. Here's the explanation for each of them in simple way.

    TDMA Time division multiple access TDMA is a method of communication. Here each user connected to the nearby tower gets specific time block for transmit and reception. The separation of the type of data transfer and congestion are handled differently in both 3G and 4G networks. Considering the networks are using digital transmission, the data and voice signals are lot clear and have less noise compared to old analog signals using same technology.

    FDMA Frequency division multiple access FDMA is a method of communication where frequency slots are divided for each user on resource sharing model. It is one of the oldest method in the telecom communication. In earlier days the signal divided was analog hence had lossy transmission for audio and data. In modern days digital transmission has reduced the signal loss and hence improve voice and data communication in lossless way.

    Do note that marketing people are promoting 3G and 4G as if it's some advanced technology. Underlying process for 3G however is still CDMA that makes use of either TDMA or FDMA or both. In case of 4G the networks make use of LTE that comprises of OFDMA and SC-FDMA. There is nothing ground breaking research on 2G, 3G, 4G as of yet, they are still making use of DMA (division multiple access) since analog days, only with difference of digitization that can serve larger number of users for a given band in specific tower region.

  • #12665
    The status of this response is Pending and require some modification by the author.

    TDMA and FDMA basically differs in the following ways.

    FDMA- FDMA stands for Frequency Division Multiple Access. In this method different channels are separated from one another using different frequencies. The full form of the technique simply describes the whole scenario. Let us understand this technique with the help of an example, when a person wants to have a conversation, a separate channel is allotted to that person individually means for every conversation there will be separate frequency division as per the definition of this division technique.

    TDMA- TDMA stands for Time Division Multiple Access. This type of division technique use time division technique to divide the same frequency among the users. This technique helps to use the same frequency channel more efficiently and hence many users can use the same frequency channel. The shuffling of the time is designed in such a way between the user that they don't even know that they are sharing the same frequency with someone else.


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