2.2 - MULTIPLE ACCESS - FDMA/TDMA/CDMA/OFDMA
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- Опубліковано 26 сер 2024
- Multiple Access - FDMA/TDMA/CDMA/OFDMA in 4G LTE
Multiplexing is the process of combining multiple signals and transmitting them over a common channel and it is implemented on telecommunication using Multiple Access as a Application.
Here, Multiple Access is explained with the example of Wi-Fi Hotspot sharing its internet connection among multiple users by providing them a frequency block over which they can transmit and receive data. The greater the size of this block, greater is the throughput.
There are several way by which we can use Multiple Access Technique such as TDMA, FDMA, CDMA, W-CDMA, SDMA, OFDMA, SCMA.
We have also mentioned, How TDMA and FDMA, CDMA, W-CDMA works and implemented in Earlier Generation system which is AMPS, GSM, GPRS, EDGE, UMTS, HSPA+.
To overcome issues faced in earlier generation such as,
- Low Throughput
- Low Spectral efficiency
- Resource wastage and many more,
We have introduce next Generation Multiple Access technique which is already deployed in WIFI and in WIMAX, but due to lack of backward compatibility and support for Mobile communication in WiMAX, Operator started to working OFDM to include in LTE.
Below is the link for all the fundamentals,
• 2 - Fundamental Of 4G ...
Reference:-
Content - 1. Wikipedia
2. Radio Electronics
3. www.wiley.com//...
4. Other Web Sources
Music - Bensound, Google youtube audio library
Vector Images - Open Library, Openclipart Gallary
Happy Learning.
Very informative, would be even more attractive if you used a real human voice (or a better voice) for the explanation rather than system voice which is monotonous to hear. But great animations and breakdown of concepts.
+Vishal Vudayagiri - Hi Vishal. Thanks for your valuable feedback. We tried using real voice. But due to lack of proper studio type environment and our accent, that idea had to be scrapped. Using two voices and a soothing background music were the only logical option we had; to break the monotony.
Maybe in future we will use real voice. Till then bear with us.
Happy learning.
Hi Vishal We have finally started using human voice. Do help us with a feedback.
I'd love to help you with that for no cost. I'm into voice acting, and also am graduating in Telecommunications Engineering, having worked with Mobile Networks.
viniciuscunha013@gmail.com
Reach me out !
LTE .I like the voice ..used system voice is great..love to hear it...real voice has too many breaks and eventually makes u loose attention..and interest
Sanwork Knowledge: ua-cam.com/video/aXt9HWwjPME/v-deo.html
Sanwork Knowledge: Watch and subscribe 👍🏻
i watched this video in 4th semester of engineering and i did't understand, today i will recommend it to everyone. . .
I have never understood wireless communication BETTER!! I am so happy to have discovered this channel!!!! Thank you!!!
Thanks Sukriti. Happy Learning!
Fantastic set of videos, your new one using human voice is much more pleasant. Thanks for the great work
+Never fart on a man's balls - Thanks. Personally we will feel better if you could change your name.
Was searching for a good lecture.Found this.Thanks for the video.
The best method and presentation for Multiple Access technologies.Excellent job.Very informative and reliable for telecom Engineers specially beginners
+Ayub Khan - Thanks a lot. Happy Learning
Thanks for explaining the evolution of communication .....
This is an excellent telecom video tutorial, the best i have ever seen. Great job! The presenters should be given an award and they deserve a Nobel Prize.
+wci kansas lol! Thanx for the nice words. But Nobel Prize is a little extreme. :P
Aw man! You broke our heart. We had our backpacks ready for a trip to Sweden.
Nobel prize is extreme af ahhahaha
Wow, if this video came out in 2005, we could improve earth technology way earlier
Very informative video. Love from India
very informative, provides good knowledge to Starter, presentation is outstanding. Thanks
+Sucha gul - Thanks a lot sir
It's easy to understand, I've shared those video to my friends. Thanks those video makers.
thanks Benle for your support. It means a lot.
Pretty decent description of wireless tech.
Thank You for explaining the concept in such a great way.
+Karan Goel thanks Karan. We try our best. Stay with us to explore more.
Happy learning.
For some weird reason I find this text-to-speech voice quite suitable for this video series.. D: / :D
I am loving it guys. Keep up the great work. Even i like the way of presentation, you guys made it so interactive for leaning.
Thanks a lot. Happy Learning.
it is good videos
Bonjour
ce cours est super bon même si j'ai eu du mal comprendre l'anglais mais les illustrations sont trop cool
merci infiniment et j'espère le revoir en français si possible
Easy to understand such a big concept in a easy way..with gud presentation..
Thanks Sonu
very thankful videos on LTE , such a phenomenal job,eagerly waiting for upcoming
+Naveen Prajapat - Thanks Naveen. If things go right, we will upload it by 1st week of December.
My pleasure LTE
Great job thank you alot..... You should be given an award
Thanks Jawad. We are just trying to spread knowledge.
Visual concept are awesome. Imo please consider audio effects and tempo, for me it's little bit unnatural. Anyway great job and waiting for more.
+Forein Tes - the audio effects are loud and the videos move fast. Is that what you mean to say?
GREAT VIDEO!
VERY MONOTONE!
best video on youtube. Thanks a lot
Yet now i cannot understand how FDMA, TDMA, CDMA, WCDA really works.
How these phenomenons are physically used? I dont believe they exist.
If you can make a video on it, I'll appreciate.
What don't you understand? Maybe I can help.
LONG TERMINAL EVOLUTION
1:15 Since separate nodes are transmitting at different frequencies, they wouldn't be detected as one smooth wave as you show. It would be detected as multiple simultaneous waves at different frequencies.
This was like a summary video. Should have to be more longer. By the way nicely explained.
This is ACTUALLY a summary video. Our main target is LTE but we thought without discussing Multiple Access techniques we cannot explain OFDMA. We are glad that you liked the video.
Happy Learning :)
thanks for the video
the electronic voices are a bit monotonous, but still the content is great
keep it up
+MrBitviper - Thanks for understanding. What do you think of our latest videos which contains human voice?
YOU ARE AMAZING GUYS. I LOVE YOU!
Very nice effort. Keep it up. And Thanks for such a helpful video.
+Irfan Sultan - Always happy to help. Happy Learning. :)
What a understandable lecture hats off
Thank you!
Not the robot voice again !!! DAMN iT !
+Ne May - This video was uploaded in August and yes we were using text to speech converter back then. Watch our last 2 videos on CA and HetNet. We have used human voice. Do share your feedback with us.
Happy Learning
Fantastic explanation.
Thanks! great video, but sounds like i'm listening to Rosie the Robot Maid from the Jettsons...
Very well explained.Thank you. Can you please share the references used in making this videos(for eg: technical papers) other than the one mentioned above.
+Mahesh Kalkundri - We didn't use any technical papers. The video covers only the basics. So the sources mentioned in the description were sufficient.
ok fine :)
Waiting eagerly for upcoming videos.
+Tarandeep Kalra - wait for a few more days. I assure you, it will be worth the wait. In the meantime you can watch the other videos and share your opinion.
Happy Learning.
I already have seen all the other ones :-).Seeing these videos reignited my interest in learning LTE.
+Tarandeep Kalra- lol. Thanks Tarandeep. We are trying our best to complete our next video as fast as possible.
Actually, the video is only 6 minutes but I take 2 hours to re-watch and understand what is modulation used in CDMA, like LDPC code or Turbo codes
Like the voice👍
I like all your videos but all those are fast. could you be please bit slower?
+Freebirds 360 - we have tried to maintain a tempo so that people don't get bored. We will try to slow it down in our next video. You can try pausing and replaying if you are finding it difficult to follow.
you can literally slow the video down under the speed option.
If WDMA is based on color, then that's equivalent to FDMA. Color is frequency.
from a tactical perspective (military) what are the pros and cons of FDMA v TDMA ?
+meLLoxo as far as military use is concerned, both TDMA and FDMA are inferior to CDMA which was specifically designed for this purpose because of its spread spectrum nature and later gained widespread use in the public telecommunication domain.
thank! It is easy to understand
Awesome Simple video. Thanks for effort.
+Gyan Deep - Thanks a lot. We try our best to spread deep gyan. :)
Don't worry . I am spreading it too. That's minimum I can do.
+Gyan Deep - Thanks a lot for your help.
Happy learning
Great job, does anyone know what they are using to make these drawings please ?
Romba speed a poreenga.but super explanation.konjam speed a reduce pannikonga
thank you very much for this video
Is it possible to get the content that you have used for the video in the form of document/notes?It would be really helpful.
Slow it down guys, too fast. Takes away from the very good explanation..
جميل لانه مترجم للعربية... شكراً
grt work,easy to understand but some time little bit fast
+Dushyant Arya - Thanks man. We will try to keep the tempo low in our upcoming videos. You can try pausing the video when you face problem.
Can we get more such videos on LTE..RACH,CELL SEARCH PROCEDURE AND MEASUREMENTS...Would also like to be a part of this do let me know if I could be of any help in making these videos
Is Frequency hopping in gsm and sub carriers in ofdma is same???
Super machchi
Good because it translate into Arabic.... Thanks
Explained well but slow it down all the videos are very fast Thanku!
Thanks Divya. We will keep your concern in mind. You can always pause if you are facing difficulty in understanding. If you want we can share the trnscript with you.
Happy Learning
Great animation. It is very easy to understand. But the female system voice is hard to hear.
Thanks for ur information
You are welcome Rajan. Happy Learning
Nice lecture ... #HariKrishnaSahu
Hi great video my name is David Adams I am the legal patent owner of 10 global patents my late father Andrew Brian Johnson invented the GSM 202 204 206 base station digital data transciever in 1989 whilst working for telecom Australia. He was under contract with Telstra as co-investors from 21/9/1993-21/9/2001 then he became soul owner of said inventor patent. 1 month later he died. In the same month 3G was released.24/10/2001. Then for 15 years Telstra have stolen sold and robbed my fathers legacy from his grave.. As I had no knowledge of my fathers achievements until I google searched him late last year. I'm still trying too understand a lot about the wireless packet concept as it's quite complex
Really sad to hear that. Is there any way we can help you?
Hi,
Can we provide 100% overlap coverage, using 5MHz bandwidth in 700 MHz spectrum in LTE?
Great Job...
Thanks Vignesh
So whats the difference between FDMA and Wavelength DMA
Love this alot
+Agung Kesava - Happy Learning mate
Good
Very informative, would be even more attractive if you used a real human voice (or a better voice) for the explanation rather than system voice which is monotonous to hear. But great animations and breakdown of concepts
you should add sdma
nice making very interested
How guard bands works and what is need for this
very use full
+GPraveen Kumar - Thanks buddy
What program you use for creating these presentations? They are really nice
+Lukasz Stanek - Trade secret. Can't reveal. ;)
very good video. however I need CDMA in details (I mean with mathematical examples). can you provide some trusted link for that? or can you make video for that?
+Ravi Raushan Kumar, we are considering a series on aspects of LTE only, so CDMA is out of our scope.. to get good information on CDMA, you can follow NPTEL series on SS and CDMA at nptel.ac.in/courses/117104099/13.
Thanks
+Ravi Raushan Kumar - always happy to help
Fui obrigado a ver.
nice explanation
+MUHAMED AZAHIR Thnks. Don't forget to share it with your friends.
yaaah sure
it helps to my exam
👍👍
Great good info
+Stack Programer - Thanks a lot
great !!
+Nachiket Ayir thanks for appreciation...stay tune for future videos..
which software use
Nice
With the text to voices I feel like I am gonna get arrested for watching this.
Better than hindi
My phone provider support CDMA . Will WCDMA work with my provider ?
Wcdma is umts/hspa+ so no
What is the name of your organization
superb....
+Brahmam Guntakala - Thanks a lot
Thanks very informative
+Apratim Sinha thank you...stay tuned for upcoming videos..
Great
Every one is here just becoz of 7 lakh veiws😂
useful
HI LTE,
Thanks for the information through videos.
Can you share the information, How do you make these video and animation?
Thanks
Hello Arif,
We use VideoScribe for animation and Adobe audition for sound processing.
Thank you
Good visualisation , just use better human voice as it doesn’t feel connected to the voice and takes time to understand what does it exactly mean.
We can understand. That's why we migrated to human voice in the latest videos.
Happy Learning
mam please explain slowly
+Sandip Avere - you can pause and replay.
you can literally slow it down to .75 under the speed option.
hi, pls i need help in plotting BER ves SNR in matlab can you help
+Huda Anwer, sorry to tell you but plotting of BER vs SNR is something we have not covered in our video series and is neither in our future options... Btw you can check MATLAB threads on this topic: in.mathworks.com/matlabcentral/newsreader/view_ thread/41353
Exactly AWOME
2:25
Good job, I understand that thanks to you Can I get a lot of information and how to run this technique should SOFTWIRE such as Riverbed plzzzzzzzz ":9
+Abeer Ben - Hello! We couldn't understand your question.
okay , am sorry but i mean
"simulation"
How can OFDMA technology application
? Software such as the Riverbed
+Abeer Ben we are extremely sorry. We haven't used that tool. Can you tell us few things about it?
"oh eff" d m a
are u gonna evolve to 5G
O F D M A
We need more videos translated into Arabic
TDMA for 2 G, not for 1G
FDMA for 1 G, not for 2 G
the video is too fast. otherwise it may be a good video.