8 years later and this video is still a banger, I have a digital communications exam in a few days. Lecturer could not explain this concept to save his life, honestly, it would have been over for him in a hostage situation. You have saved me, thank you so much.
Nice explanation ! What I have learnt(Just for my reference) 1. start with transmit y(t) = A_k * cos(w_c*t + theta_c) 2. PSK and ASK 3. how to construct the constellation diagram from PSK and ASK 3.1 constellation diagram is just in the complex plane, a dot is representing the phase and the amplitude of A_k and theta_c in y(t) = A_k * cos(w_c*t + theta_c) 3.2 how to correct the attenuation of received y(t) from determining the decision boundary at the constellation diagram 3.3. eg of 8-PSK and 8-QAM 3.3.1 8 mean 8 dot and thus 3 bit 3.4 QAM mean quadrature amplitude modulation
I have attended many lectures with one of the most renowned communications professors in my country but I haven't understood these concepts until you appear and explain in such a refreshingly simple way that I finally get it! Great presentation! Thank you for sharing your knowledge, sir.
@7:35 I am actually looking for the right positioning manner like where would 111 w.r.t. 000.what is the method to find that I am unable to find any explanation
Hi excellent explanation, do you have any tutorials or examples on how to determine basis signals and how to portray the signals as linear combinations of the basis signals?
If your application is decomposing a signal into sinusoids, then I would recommend my Fourier Series videos. However, for arbitrary basis signals, I'm afraid I do not have anything explicitly on the topic. I believe, though, that if you thoroughly understand Fourier Series, you should be able to transfer that knowledge to your specific topic.
Technically, that should never happen since we are dealing with continuous values. For example, suppose the phase noise shifts by 45 degrees. But it's never exactly 45 degrees. It is probably more like 45.0000000000000000000001 degrees, which is on a particular side of the boundary. Another way to think about it is if it lands exactly on a boundary, you might as well flip a coin as to whether it goes on one side or the other, since there is no way to really tell. I hope this helps!
Are there modulation schemes that add polarization to the constellation to add more throughput or is this not a reliable thing through a medium? How many bits would it allow you to transfer at once if you just used circular polarization and would it interfere with the PSK or ASK?
Using polarization to add more throughput is a good method, but not at the introductory level. There is a literature on polarization shift keying (POLSK) if you are interested to explore it. As far as interference with ASK or PSK, it should not be a problem, since ASK and PSK affect the physical characteristics of the sinusoid, whereas POLSK affects how the signals are physically transmitted. The number of bits per symbol would then depend on the polarization techniques that you are using.
They are actually the in-phase and quadrature axes. They are both necessary in order to form a sinusoid with both a particular amplitude and phase. I hope this makes sense!
Thanks for the reply! It is nice and reassuring to know that even though these videos are a few years old, you are still actively responding to comments/questions. Thanks once again!
In the reciver, the recived signel can be map up on the Constellation Diagrams and eliminate noise , but may I ask how does the reciver know the chronological order??? It's puzzled me for a long time .
The kind of constellation diagrams in this video only support PSK, ASK, and QAM. For FSK, you would plot the different orthogonal frequencies on the axes of a diagram. As far as Gram-Schmidt, it is used to find an orthogonal basis for non-orthogonal vectors (or functions). Therefore, I am assuming that you are starting with a non-orthogonal FSK scheme, and want to create an orthogonal one. That topic is a bit beyond the scope of this video, though.
I'm not sure I understand your question, since this method is used precisely for that purpose. Each point on the diagram is a received (or transmitted) RF signal.
Thank you for your comment. What you are describing is called OOK (on-off keying), and is a form of ASK. More generally, ASK encodes a message using any combination of unique amplitudes of the carrier.
The concept was modulated such a way by you that there is zero loss on detection by me.
Your comment just made my day!
sir , Your lecture made my viva. Thank you so much.
8 years later and this video is still a banger, I have a digital communications exam in a few days. Lecturer could not explain this concept to save his life, honestly, it would have been over for him in a hostage situation. You have saved me, thank you so much.
trying to understand it for years... it's my first time to find someone who present it in this simple easy way .. Thank you sir
Thank you for your kind words. I'm very glad you found this useful!
Nice explanation !
What I have learnt(Just for my reference)
1. start with transmit y(t) = A_k * cos(w_c*t + theta_c)
2. PSK and ASK
3. how to construct the constellation diagram from PSK and ASK
3.1 constellation diagram is just in the complex plane, a dot is representing the phase and the amplitude of A_k and theta_c in y(t) = A_k * cos(w_c*t + theta_c)
3.2 how to correct the attenuation of received y(t) from determining the decision boundary at the constellation diagram
3.3. eg of 8-PSK and 8-QAM
3.3.1 8 mean 8 dot and thus 3 bit
3.4 QAM mean quadrature amplitude modulation
Good summary!
Zero noises introduced! Never thought youtube could be such an impeccable transmission medium ! Thank you !
I'm very glad I could help! And I really like your comment :)
1 week worth of my lectures are packed skillfully into this 15-minute video. Thank you! You are amazing!
I'm very happy to help!
I have attended many lectures with one of the most renowned communications professors in my country but I haven't understood these concepts until you appear and explain in such a refreshingly simple way that I finally get it! Great presentation! Thank you for sharing your knowledge, sir.
Thank you for your kind words! I'm very glad I could help!
Way better than all those Indian explanations on RUclips out there! :D Thx
Glad to help!
Fantastic explanation. I would not be able to keep up with my job without "knowledge refreshes" from 10/10 youtube videos like this! thanks so much.
Thank you for your kind words! Happy to help!
one of the most excellent explanations, so far I have seen
hello ilya, you have the enviable skill of taking complex topics and distilling them in simple terms (without loss of fidelity).
Thank you so much for your kind words!
I was trying to understand this topic since two days and luckily I found this video, thanks a lot . Now my concept is crystal clear :) thanks again
I want to make my college lecturer sit and listen to you.
That's great and simple explanation. #awesome
why did I even begin to try to understand this in Proakis' book!
thanks a lot. concise and to the point :)
I'm glad I could be of help!
Thank you for this video. The concept is explained in detail but in simple words. That makes it very easy to grab the basic concept
I'm really glad you liked the explanation!
Best explanation i ever had. Please make more videos for Communication System
Very clear and helpful presentation. Thanks for posting this!
You're very welcome!
great explanation of this subject, my teacher sucks so i came here and now i understand this, thanks
Happy to help!
Very neatly and simply explained! thank u sir
I'm really glad I could help!
Wow, first time I understand about QAM modulation, and the purpose of the constellation diagram
I'm very glad I could help!
YES, THANK YOU SO MUCH. Seriously, I was trying to figure this out through Haykin and it sometimes gets too dense, your explanation was incredible.
I'm very glad I could help!
You have explained it very nicely great job man.
Thank you for explaining the constellations concept in such a simple yet effective way.
I spent so much time trying to understand that but you made it so easy ..thanks alotttt❤❤❤❤
I am very glad I could help!
excellent !! very beautifully presented in simple and lucid way !! loved it
Thank you for your kind words!
Great knowledge searching same from long time
Thanx 👍
I'm very glad I could be of help!
Great explanation and thank you 💗💗💞💞👌👌
thanx a lot Ilya...really crystal clear explanation...well done sir.
I'm very glad I could be of help!
Wonderful explanation! THANK YOU
Great explanation thank you very much. Love from india
You are very welcome!
one of the best explanations I got, thanks a lot!
Thanks, it couldn't be better explained. Great Job!
Thank you! I'm very glad I could help!
Thank you for the wonderful explanation, sir !
This lecture is gold...Thank you
Glad I could help!
exellently explained sir.stay happy.
Thanks for the video: by very simple means - just sketch on screen, I finally understood IQ diagram
I'm very glad I could help!
This is soo clear, simple and beneficial, thank you very much!
May Allah bless you
Crystal clear explanation! Thank u !
Very well explained.
Thank you for taking your time out to upload =)
I'm really glad I could help!
Probability of error (this video)= 0....
Thanks bro...for such wonderful explaination
It's my pleasure!
@@IlyaMikhelson i have some doubts in the communication subject.......
Thanks for your simple explanation. 😍
Very glad to help!
Excellent Explanation. Thank You.
I'm very glad I could help!
What an excellent explanation!!
Always happy to help!
Crystal clear explanation...
I'm very glad you think so!
Well explained Ilya. Thanks
Thank you very much. I finally know how data bits are transmitted in waves.
Thank you. Helped me a lot!
Brilliant explanation, thanks
This is amazing, the way you have explained it, great content. 🙂
you saved my ass in a Universityexam :) good job
Thank You for a very good explanation.
Outstanding job, thank you!!
great explanation, thank you!
Really Helped me ..Thanks!
You're welcome!
Interesting video. Thank you.
Great video! Thanks!
Very much useful. Thank you so much :)
Thank you for clearing all my doubts
I'm very happy to help!
Excellent explanation
I'm very glad I could help!
Very Well Explained. Everything was perfect and to the point. Cleared some of my doubts. Can you make video on QPSK?
I'm glad I could help! For QPSK, it is the same as 8-PSK, with just 4 points around a circle. Is there something particular you would like to know?
very good explanation...
Thank you!
You are the best!
Glad to help!
It was really helpful
Thank you
I'm very glad I could help!
@7:35 I am actually looking for the right positioning manner like where would 111 w.r.t. 000.what is the method to find that I am unable to find any explanation
Great.you earned a new sub.
Hi excellent explanation, do you have any tutorials or examples on how to determine basis signals and how to portray the signals as linear combinations of the basis signals?
If your application is decomposing a signal into sinusoids, then I would recommend my Fourier Series videos. However, for arbitrary basis signals, I'm afraid I do not have anything explicitly on the topic. I believe, though, that if you thoroughly understand Fourier Series, you should be able to transfer that knowledge to your specific topic.
thank god as well as SEO system.
1st video I came across was this one and I dont want anymore videos on this concept.
I love your comment :)
Very good video!!
Glad to help!
nice explanation sir
Awesome video ! please what software are you using to write ?
Thank you! I am using Microsoft OneNote.
Excellent presentation
Thank you!
Sorry I lost for some... what if the point we get is right on a decision boundary? Does it mean it actually is an error?
Technically, that should never happen since we are dealing with continuous values. For example, suppose the phase noise shifts by 45 degrees. But it's never exactly 45 degrees. It is probably more like 45.0000000000000000000001 degrees, which is on a particular side of the boundary. Another way to think about it is if it lands exactly on a boundary, you might as well flip a coin as to whether it goes on one side or the other, since there is no way to really tell. I hope this helps!
Are there modulation schemes that add polarization to the constellation to add more throughput or is this not a reliable thing through a medium?
How many bits would it allow you to transfer at once if you just used circular polarization and would it interfere with the PSK or ASK?
Using polarization to add more throughput is a good method, but not at the introductory level. There is a literature on polarization shift keying (POLSK) if you are interested to explore it. As far as interference with ASK or PSK, it should not be a problem, since ASK and PSK affect the physical characteristics of the sinusoid, whereas POLSK affects how the signals are physically transmitted. The number of bits per symbol would then depend on the polarization techniques that you are using.
thank you, its always interesting to think on how tech can be expanded
Excellent!
I'm glad you found this helpful!
Спасибо, очень хорошо обьяснено
You are welcome! I am glad I could help!
So if I understand correctly, the dots closest to the origin are the most vulnerable to interference as they have the shortest amplitude vector?
Thanks for a very helpful video but I have one quick question: What are the x and y axis labels? Amplitude and phase?
They are actually the in-phase and quadrature axes. They are both necessary in order to form a sinusoid with both a particular amplitude and phase. I hope this makes sense!
Thanks for the reply! It is nice and reassuring to know that even though these videos are a few years old, you are still actively responding to comments/questions. Thanks once again!
My pleasure!
Keep it up sir
just awesome !
thank you very much sir
My pleasure!
In the reciver, the recived signel can be map up on the Constellation Diagrams and eliminate noise , but may I ask how does the reciver know the chronological order??? It's puzzled me for a long time .
Brilliant !
Thank you!
Awesome.. Thanks..
Thank you dear.
You're very welcome!
Thank you so much!!
My pleasure!
nice one
How to decide which is the best modulation technique using constellation diagram
Can u pl tell what is Eulidian distance?
It is just the distance between two points, usually calculated using the Pythagorean theorem.
amazing! thanks
so good
please how do i draw a constellation diagram for Orthogonal FSK function using Gram-Schmidth procedure
The kind of constellation diagrams in this video only support PSK, ASK, and QAM. For FSK, you would plot the different orthogonal frequencies on the axes of a diagram. As far as Gram-Schmidt, it is used to find an orthogonal basis for non-orthogonal vectors (or functions). Therefore, I am assuming that you are starting with a non-orthogonal FSK scheme, and want to create an orthogonal one. That topic is a bit beyond the scope of this video, though.
is it possible to write down RF signal using this method ???
I'm not sure I understand your question, since this method is used precisely for that purpose. Each point on the diagram is a received (or transmitted) RF signal.
plz make a video ecplaining matched filter
Thank you..
thanks sir
Nice, thank u
You're very welcome!
I thought in ASK we represent 0 and 1 by absence and presence of carrier.
Thank you for your comment. What you are describing is called OOK (on-off keying), and is a form of ASK. More generally, ASK encodes a message using any combination of unique amplitudes of the carrier.
this man is god!
I'm very glad you found the video helpful!
@@IlyaMikhelson I'm glad i found your video 1 hour before exam....
Thanks a lot
My pleasure!
How do u say 111 is that point ?
I just chose a 3-bit value at random, since I have 8 possible symbols in the scheme.