QAM, QPSK Explanation

[@SohanRidwan]

world is a better place because there's guys like you !

[@WEBBERSPADE]

return the favour Sohan! I'm sure you can contribute to sharing the knowledge too!!

[@sumittechkgp]

Robert, great contribution to mankind. We will survive as human race because people like you are around.

[@WEBBERSPADE]

Oh stop it, I only did it for fun to see what would happen. not for the 100k+ views!!

[@reemm.hussein1369]

+Robert Webber okay then please keep doing these things for fun your way to explain things are awesome god bless you ^-^

[@FelLoss0]

I agree. Thanks to people like you this society will be better! Thanks for making the complex stuff in a easy thing like this:)

[@ChristianWilhelmsen]

From Wikipedias PSK article, its stated that "Although the root concepts of QPSK and 4-QAM are different, the resulting modulated radio waves are exactly the same". That is what put me off a bit. Thank you for your quick response and incredibly great videos!

[@farhanbadar1716]

What a shot Robert Webber. I have listen many other people but the way you have explained QPSK is just toooooo awesome. It is simply a crystal clear explanation. Hats off !!!!

[@JoelMurphy77]

Thank you for this video. I recently got hired by a company that produces cable test equipment and this is helping a lot.

[@asifharoon6345]

Robert this is ever easiest way to understand constellation diagram at the very basic level,thanks buddy to help me, may God bless you

[@justinng2808]

One of the only videos out there explaining QPSK from scratch. Awesome video for a first attempt!

[@psam1304]

Thank you John. This is the best simple explanation of QAM I have ever come across.

[@timothykeltron3447]

Thanks. I just started working in Satellite Communications and was completely clueless to what QAM/QPSK was.... now I have a better understanding. You did a great job

[@chezpaiz]

Thanks for taking the time to start at the fundamentals, I think that is the best way to teach and learn.

[@mdabuzahed637]

I was confused about difference angle and amplitude. After watching your tutorial , i got clear information . now it is transparent to me . Thanks for the tutorial.

[@greentalk3680]

The concept of modulation is finally understood after 5 years of attending university lectures on digital communication...thanks Bob.

[@BenedictBrand]

Great Video Robert, I spent 10 years as a fixed wireless access engineer working up to 256 QAM for PtMP radio systems for Cellular back haul. I always had an understanding of this, but your video has made it much clearer.

[@WEBBERSPADE]

Glad I could help. Shame you didn't find this earlier as I made it around 10 years ago!!

[@BenedictBrand]

@@WEBBERSPADE wow, time flies, I just worked it out, it was 2000 - 2009! I've since got into KVM over IP (its different, but many of the principles are relevant). I'll share this with my team as I've often tried to explain it to them.

[@WEBBERSPADE]

@@BenedictBrand do you have LinkedIn? I just tried to find you but couldn't. You can find me if you want? "Robert John Webber".

[@ashoaibus]

i did both bachelor and master in communication engineering, and i haven't met someone who explained QAM the way u did ... Thank u so much

[@andy23london]

Great! Last time i tried to learn this stuff, it was 3am in a bar in Amsterdam's Red Light District at IBC 2013. Much Easier! :) Great Tutorial thank you!

[@WEBBERSPADE]

HAHAHA! I know the feeling. Mine was more at the MWC in Barcelona.

[@WEBBERSPADE]

Cheers everyone for all the complementary comments that I receive off you. It makes me happy everytime I know I helped you. As I get various questions regarding all different uses of this, would you be interested in if I started a blog so links that are found could be shared? it could build up a vast array of knowledge to help us all out....?

[@danielgurley7377]

yes! great idea!!!!!

[@milo6829]

cheers mate!

[@Yusifinify]

Mr. Webber I appreciate the response. The QAM topic was actually postponed because the instructor wanted to cover FM/PM first. I can think of two points of feedback that may improve the videos. First would be including a problem and solution to show how the relevant mathematical principals are applied. The second would be using one of those electric pens so the whole thing can play out on a computer screen. It would make viewing easier in terms of glare and having your arm in the way. Thanks!

[@qwertrewq9879878712]

Hi, Just want to thank you! From Montevideo,Uruguay. The first time I rurally understood qam ,I hope this help me to succeed on my next Modulation course exam.actually studying electrical engineering.

[@99cent266]

Thanks Robert.My lab teacher could not explain me the QPSK graph.And I was really troubled.Thanks again.

[@darkblood2275]

Wow...Robert. That's super way of explaining. Was dumb about 'QAM'...but no more...Kudos to you.

[@vinaygurusimha]

I just saw this video.. as some of my friends wanted to know about QAM,QPSK. Have to say amazing effort.. and very good explanation... Sorry to be reviewing this critically.. but at one point you say 0 to 16 for 16 QAM ( its 0 to 15) ... just a very minor error .. but you can probly add as a note or so (it is around 24:11) Finally .. thanks from all of us.. great !

[@TheTrini1980]

The best explanation of QAM I've ever seen!

[@gudaendla]

Rob, Excellent Video & excellent teaching skills. You may not see yourself good video maker but the way you taught the topic, it was excellent. Thanks for the video.

[@MortonMoep]

Thanks a lot for the explanation. I have my exam tomorrow and modulations like this will be part of it. Best greetings from germany.

[@RishiKumar-nl9es]

Awesome Explanation Robert.... I believe you are the outstanding Professor..Thank a lot and keep posting more video..

[@stevphie]

i always hate math and numbers but i love watching people doing it right..great vid bud

[@EEVOL]

Mr. Webber, great explanation! I'm an electrical engineer and was looking for a video to explain in simpler terms (i.e. to non-engineers). Your video was quite informative and was exactly what I was looking for, thank you.

[@Corporate_Adda]

hey nice explanation i loved ur that little board its really aowsome

[@THEBIGSAM444]

Hey Robert Thanks for the video , It made it easy for me to Understand the the modulation methods ...You are the Best

[@annabednarska8272]

Amazing! Your explanations helped me to pass my graduation exam! Thank you! :D

[@MrRajanikanthachar]

Thank you very much. Your way of explanation is very good. Please keep posting such videos more and more.

[@michaelmcgovern8447]

This is an excellent explanation of QAM for students. Really well explained

[@vincat84]

You are the best Robert Webber!! great explanation! Now I will watch part 2 =P ....thanks a lot

[@usandhu]

Wow....amazing tutorial! I've gone through so many websites, documents , books in past few days to properly understand QAM but without any luck. After going through your video I feel much better. You're an amazing teacher. Looking forward to check your all others videos too. Thanks.

[@calk1calk]

Im 16 and that video finally helped me to completely understand it! Many thanks :)

[@fernandogoliveira]

Nice tutorial. As Amit, I have finally understood how QAM and QPSK modulation mean.

[@rionor000]

OMG... I am studying electrical engineering and you really explain it so clearly.... Amazing work :) Btw, believe it or not: if you ask many electrical students on how they got QPSK, they will not answer it fully like in this video!!!! These kind of basics are very important

[@anyu686]

Excellent I am major in telecommunication and my final year project is about Qam . Helpful for me thank u . Hope more video

[@patternabstractions]

Fantastic!! Clear and concise. Brilliant. Many thanks.

[@mariasalagean2308]

Great video! After so much time I can finally understand how these things work! Congratulations and keep up the good work!

[@CannabistlanPod]

All my math classes just came together. Awesome explanation man.

[@ageualves794]

Despite your self declared youth, remarkable explanation.Thanks.

[@z3082026]

thank you RObert. It's really helpful.

[@fuahuahuatime5196]

To skip all the baby stuff: 9:40. There are different encodings for #QAM (4QAM, 16QAM, etc). Basically, 4QAM encodes different phases (180 degree shifts) of sin and cos to 4 binary numbers such that a cos represents the least significant bit and sin represents the most significant bit. The encoding adds these two waves together, which is then superimposed onto the carrier wave. For instance, for an encoding of 00 (decimal 0, representing +sin and +cos), these two are added (effects amplitude) and is superimposed onto the carrier wave. The encoding used is #QAM (4QAM, 16,QAM, etc), where each number can be represented on a polar graph as a separate vector.

[@WEBBERSPADE]

Hence Check part 2..

[@arnaldbothalage6767]

Woooow nice tutorial.I thought that i can't undestand the theory of drawing constelation diagram in my life time.via this tutorial i understood everything about how to draw a constelation diagram...tnx a lot..

[@vlbvinoth]

ROBERT IT'S VERY INFORMATIVE ....U R SUCH A GREAT GENIUS....THANKS A LOT......I REALLY ENJOYED.......

[@MrPuneeshKhanna]

Superb explanation, I have been trying to understand these concepts for quite a bit and this is the best way I have come across and finally got to understand very clearly after watching this lecture

[@mariyathasgeethanraj9414]

good presentation sir. its very usefull for my final project presentation....finally wonderfull sir.

[@Yusifinify]

Thank you for the video! I am currently taking a Communications Theory class and tomorrow we are covering QAM. I feel much more confident going in now, looking forward to check out the second video now.

[@anithatg1]

Hello Rob, Thank you for uploading such a simple to follow video on QAM. Helped me lot in refreshing my basics.

[@adityatyagi4009]

Wow, this stuff is easier than I thought. Thanks for the lecture mate!

[@gokuljith]

Great tutorial. Keep doing it for all the concepts in communication... All the very best

[@jkundani]

thank you very much... this video cleared my concept of QAM.. thnx for your help... ^_^

[@kaicamp9101]

That was awesome, beautiful breakdown of how to show qam

[@rksingh8518]

Robert this is excellent explanation.

[@WEBBERSPADE]

Thanks. It's a real pleasure to have helped you

[@WEBBERSPADE]

I am very proud that I can influence you so positively!

[@darthvivek7228]

Great video Robert. Very simple. Thanks

[@cipmars]

Thank you for explaining, this here is the base of WIFI and satellite TV, to put it simply. NOW I can understand it!

[@wallymoore7224]

Very informative and well presented. Thanks!

[@w410921]

Thanks Robert, I have managed to work it out myself, these are the points on the axis i.e the phase

[@AnumitKaur0211]

Thanks a lot for such a great video. Just one little thing: in 16 QAM it should go from 0 to 15 and not 16. Thanks again for the helpful video. :)

[@stevenwinsir6229]

excellent. very good explanation and very easy to understand.

[@edagottisudarsan8674]

Robert, clear explanation. Thanks a lot

[@saeedabbas9217]

Very nice tutorial. My concepts have now been cleared.

[@hammetmetallica9649]

I got the clear picture now and better understanding on it...thanks a lot bro

[@drathinavel]

Really good explanation... Thanks a lot Robert...

[@Ruben-tm3fg]

Thanks alot for the very simply and easy to understand explanation, I'm new in all this telecommunication stuff. Hope you do more videos

[@getmani25091980]

Excellent Information shared. Thanks you very much..!!

[@ananinamigariyaw2]

Thank you so much for addin this video tutorials onto youtube Robert! I really learned and enjoyed there. Take care!

[@dseemiller]

Good Video. It's been very helpful for the 17 year old son.

[@pawan2415]

This is a good video to understand QAM thanks robert.

[@WEBBERSPADE]

Hello Stevphie. The 1/2 and 5/6 are referring to a different part to the OFDM System. It is called the code rate. You´ll have to look into that separate from QAM. Basically it is the ratio of what data is repeated. Data gets repeated incase of errors. So in 1/2, half of all the bits received are actually repeats, and in 5/6, only five sixths are useful data when the other sixth is a repetition of data. Search for CODE RATE in OFDM. Let me know how you get on. Take care

[@jaehoonshim5932]

Great Job! I hope you do more of these stuff.

[@oojafink]

Thanks man. As someone who uplinks to satellite every day using QPSK modulated signals, it's nice to understand the science behind it. I get the phase constellation, although I need to find out how you knew that the peaks of the two example waves were '135' and '225' which was then plotted on the polar graph.

[@paulcook4807]

This is such a good lecture I think it is worthy of re-doing with better lighting & sound

[@juankrubio]

Thanks Robert, I was having a really hard time understanding QPSK. This helped a lot!

[@joshuageorge7246]

Such a great video! I learnt a lot of new things here! Thank you so much for sharing your knowledge!

[@rayhzaamatistagutierrez6894]

men your arm scared me a few seconds XD but dammit, from a student of telecom engineering i must say THANKS MEN, i'm in my last step and your video clear me a lot of things, really thank you

[@ottriebe]

Very good video, easy to understand. Compliments

[@WEBBERSPADE]

Hello, yes its how digital information (so thats lots of binary 1s and 0s) into a wave that can be broadcast. Have a search for DVB-T and LTE to get an idea of how useful it is. Hope that helps!

[@WEBBERSPADE]

Hello Christian, Thanks for the complement! The shift will be relative to the shape of the wave it is currently processing....... Imaging that I´m travelling on my Sine wave, I start at 0, then I curve up to a peak, then I start to fall down, then (and I use this moment as an example) when I arrive at 0 again, instead of carrying on down to a trough I find that my course has changed and I´m now rising up again. That is difficult to explain in words. Another quick video I think I need to make!

[@jawed948]

Great explanation ...Keep it up Robert....Thanks

[@kubislavcze]

Very good tutorial, good explanation.

[@sunnyboy866]

A very nice and easily understandable explanation

[@HassytheWitcher]

simple and clear..Good job sir..

[@rockthisboyee]

Awesome video, thank you for taking the time to explain.

[@mahmudurrahman6809]

You are awesome Robert! Thanks man!

[@kanepy]

Great explanation and a very well done video!

[@SHAH.286]

great effort sir......this lecture clear all my confusion.........thank you.

[@younesshaimi1450]

Thank you Robert, that was very helpful

[@HeikoRehm]

Great!! Finally I understood QAM/QPSK Modulation. Thanks!

[@dimassetiadi9542]

WTF know i know the detail about 'polar graph' or constellation diagram. THANKYOU SO MUCH Robert Webber !!!

[@BogdanMerza]

Great job & straightforward !!!

[@ahmedobsiyye4149]

Great tutor,you really helped me. Thanks a lot

[@surajjeoor9147]

this is best tut i ever got! good and pretty helpful !!

[@rober7407]

Thank a lot for your explanation...very clear!!

[@fastdak25]

try having more light in the room, or a spot/desk lamp focused on the board. Should help with the camera keep from continuously going out of focus, and help focus better when you zoom in.

[@radiosification]

Thanks for the reply, I am going to research this further because I don't really know about binary at all.

[@mubashirhasan2329]

this is such simple way of understanding thank u sir

[@sshetty2k]

thanks Robert for the information . Its very informative