2.3 - OFDM/ OFDMA IN 4G LTE - PART 1

OFDM/ OFDMA in 4G LTE - Part 1

How can we Stream a Full hd movies seamlessly; Which seemed impossible in legacy networks i.e 2G? What makes 4G/LTE so fast?

In this video we have shown, What are the complexities associated with wireless channel and how they are overcome.

We have discussed why wideband single channel are inefficient for transmission. We have shown how the effect of delay spread was reduced by dividing the wideband single channel into small subcarriers.

We have also shown how multi fold throughput was achieved by the introduction of orthogonality in FDMA.

Enjoy the video.
HAPPY LEARNING

Reference:
Images - Google images, Openclipart
Music - Bensound, Google youtube audio library
Content - 1. LTE – The UMTS Long Term Evolution (From Theory to Practice - book)
2. LTE Advanced by Wiley Publication - Book
3. Wikipedia
4. Radio electronics
5. Other Internet Resource

[PETAJOULE]

OFDM explained well. Multiplexing is about sharing single channel to many users. OFDM is used in wireless communication and utilize radio resources well. OFDM uses multiple small subcarriers (15kHz) so there is no much need for guard bands. Subcarriers are orthogonally placed so there is no interference. They are also overlapped in freq domain so resources are used efficiently. For 20MHz bandwidth, we have 1200 subcarriers which take 18MHz and the rest 2MHz are for guardband. So, the subcarriers value ranging from -9MHz to 9MHz travel with different sinusoids. In order to transmit symbols in these subcarriers, modulation schemes are used.

[mohammedal-haddad]

Best way to explain the subject of OFDM. Thanks for the effort.

[barisvy]

Highly useful series of short lectures. Thank you for sharing!

[teodorpetrut]

Amazing introduction, somehow it may represent the essence of a 1 year university courses on wireless communications.

[Avalanchanime]

1hr of clases = 8min of video. Perfect. Also, nobody on internet nor university ever explains ortogonality this way and is just so simple. Congrats <3

[pragyanpanigrahi]

This is the best tutorial and nicely explained about the FDMA & OFMDA.

[sukhpreetkang]

a very good and informative video is reined by background music.. it is very much easy to understand when there is male voice in video but it is opposite when there is female voice.

[michaeld]

Great, great video - and I've watched a fair few during the course of my studies.

[billions]

Excellent! very clear. succinct graphics too..

[twong]

Good job explaining the concept of OFDMA in this video!

[ominets]

Thanks for sharing, very short, informative and useful lectures.
9ICE ONE...

[joschk]

Sorry the strong reverb killed it for me. Just use normal voice, I couldnt watch the video to the end because it annoyed so hard. Which is a pitty because the animation and information seems to be quite decent. sry this is a downvote

[mustaphasesay]

Nice and wonderful technology, it worth pay any price due to high quality service for customers

[sarbjeetsingh]

High quality content...thanks for the great video!

[victorbravo]

Excellent presentation, thanks for sharing!!

[meklitnew]

Thank you for your efforts. Very nice.

[chotonrahman]

Impeccably Explained, thanks a lot....

[nicholasroos]

How to make the robot voice less robot-like? "I know! Lets add reverb!"

[Luisgarcia]

Hi guys. your videos are excellent. Nice job! I will wait for the next ones. By the way, I wish I could see an explanation so clear for the carrier aggregation part.

[Tanvi_itsjustanvi]

Hi! It's very informative but the background noise is too loud. Makes things that are being spoken very unclear.