FDMA is not vulnerable to the timing problems that TDMA has. Global Systems for Mobile communications (GSM) uses the TDMA technique. TDMA, FDMA, and CDMA TDMA requires a centralized control node, whose primary function is to transmit a .. CDMA: basic principles. Basics of TDMA, FDMA and Uploaded by Manas Das. Copyright: . Chapter 2-GSM System Principles and Call Flow. Uploaded by. Sourabh Ohri.
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Thank you for the great explanation with the diagrams.
Though should your description of the diagrams read: Single frequency is used for single call CDMA: Multiple frequencies are used for multiple calls TDMA: Cdmz thought its too difficlt to undrstnd thease tchnlgy But you made it too easy for me Thank u so so so much guys: This is quite an inspiration to resume my writing on this blog again: Thank you so so much for picking up the mistake: Have done the changes: Single frequency is used for multiple calls.
Nice blog great information. Thanks for great info. One thing I want to talk to fdmma is thank you.
Wireless Communication – Multiple Access
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I guess, one of the most basic questions which goes in our mind regarding telecom is what is the difference between the technologies which people generally talks about?
We think its too technical and stop ourselves from getting into it! Guys believe me, understanding the difference between these technologies is just not difficult! I will try to put it in a very simple way J. Frequency division multiple access FDMA: It is a technology by which the total bandwidth available to the system is divided into frequencies.
This division is done between non overlapping frequencies td,a are then assigned to each communicating pair 2 phones. FDMA is used mainly for analog transmission.
Its not that this technology is not capable of carrying digital information, but just that it is not considered to be an efficient method for digital transmission.
Because just imagine if the frequencies to handle the customers gets over? What if more capacity is required? The only option would be to drill down the existing frequencies to a much narrower amount which will not be very competent. In FDMA all users share the satellite simultaneously but each user transmits at single frequency. To understand this technology better, just imagine how FM radio works.
All the radios have their own frequency bands and they send their signals at the carefully allocated unique frequencies within the available bands. Code division multiple access CDMA: Every bit of a conversation is been tagged with a specific and unique code. The system gets a call, it allocates a unique code to that particular conversation, now the data is split into small parts and is tagged with the unique code given to the conversation of which they are part of. Now, this data in small pieces is sent over a number of the discrete frequencies available for use at any time in the specified range.
The system then at the end reassembles the conversation from the coded bits and deliver it J Does it make sense? Just think about how you recollect your luggage at the end of the flight journey. When you check in, a tag with a code is given to you which is also given to your luggage J And at the destination, you collects your luggage on the basis of that J I know you will say that you recognize your bag, but then I have a habit of always matching the codes of my bag and the one on the tag given to me and that is how I become sure of not picking up the wrong luggage J.
Time division multiple access TDMA: The system first digitizes the calls, and then combines those conversations into a unified digital stream on a single radio channel.
Now it divides each cellular channel into three time slots that means three calls get put on a single frequency and then, a time slot is assigned to each call during the conversation, a regular space in a digital stream. The users transmit in rapid succession, one after the other, each using its own time slot.
This allows multiple stations to share the same transmission medium e.
This technology enables three different users to use one frequency at the same time. Here there is no need for three separate frequencies fcma in FDMA.
Wireless Communication Multiple Access
Have tried to explain the above technologies via a diagram which is below: In the above diagram, you will observe: Single trma is used for single call.
Multiple frequencies are used for multiple calls. I hope the difference is clear now: Penned down by Cmda Singh at 5: Shivani Singh August 23, at 1: Durham Wilson November 13, at 7: Gomheat January 23, at 4: January 10, at 5: Ajay Kumar June 28, at 9: Blogg Asif Iskandar July 2, at 4: WildPeace November 2, at 8: Ankush Sharma October 28, at Shivani Singh January 25, at 9: Arrush Chopra February 9, at 3: