I feel like one comment isn't enough to express how great this video is. If i could frame this explantation and hang it in my room i would do so in a heartbeat
I am immensely greatful for this amazing explanation and visualisation of QAM. I have been wrecking my brain for days to understand this topic, but only now i feel like i can finally grasp it
Splendid video, thank you so much ❤ I would only suggest not showing all plots from the start, but rather fading them in as you talk about them, or alternatively highlighting them in some way. That way it is easier to follow what part of the image you are talking about.
Another question - what is the minimum difference in power that the RX side would detect as a "different state" for power level? It would seem at more complex states like 1024QAM, if there were 10 different states, the percentage would not be linear like 10%, 20%, ... to 100% but rather in a way that puts it consistent with dBm out (and on the RX side, equal spacing of actual received levels). Would love to hear your thoughts on this. Thanks!
I'm pretty sure what you refer to as "Amplitude Modulation" in the beginning is actually Amplitude Shift Keying (ASK) in the context of the modulation signal being a digital signal (which it is here).
I'm quite confused why OATV does not use the internet to Transfer 4k video and Dolby Soround Sound. Perhaps a big buffer to synchronize the signal, I have no idea. 🤷🏻♂️
I'm mostly curious how it can distinguish between positive and negative phase. It seems like the starting point would matter, because if you are off by half a cycle, you would interpret all of your amplitudes as inverted. And then the same goes for determining amplitude. I can see how to do amplitude relative to each other, but not how to do absolute amplitude without a 3rd signal for reference.
@7:11 Can you please help - I can't find this info anywhere. What differences are they in WiFi in the actual real world? For example, if 1.00 = 10dBm, does .75 = 8.75dBm, .5 (half power) = 7dBm, 0.25 = 4dBm and 0.00 = ? Also, for more complex forms like 1024QAM, would it be 10 difference power level states? Thanks!!
Could you explain how to get the filtering signal phase sync'd with the carrier signal ? Is frequency sync also an issue, because maybe there could be slight differences in the freq of the emitter and the receiver.
Hi, I liked very much this video. In real world, how this could be implemented? I guess it is using op-amps. Is there some real world example you could show us? Thank you very much
In 8:10 you say, we have 2 possible amplitudes but I think this is wrong. The amplitude in a constellation is the distance from the origin to a point. The plot you showed visualizes QPSK/4-QAM, where the amplitudes should always be the same.
I feel like one comment isn't enough to express how great this video is. If i could frame this explantation and hang it in my room i would do so in a heartbeat
David, this is the greatest explanation on the topic i have found in years (I am 60). BTW your graphics are amazing too.
I wish I could see more videos like this. Well structured lecture. Thank you for your time putting this together.
This is one of the most informative and useful channels, immediate follow!
I am immensely greatful for this amazing explanation and visualisation of QAM. I have been wrecking my brain for days to understand this topic, but only now i feel like i can finally grasp it
Hahh,Congratulations!
Thank you for presenting it in a such straight-forward manner
What a great video. Super well explained. Many thanks for that!!!
Best. Explanation. Ever.
You must have put so much time into this video. Thank you for that!
Man , this has to be the best explanation out there . thankyou
Fantastic! This makes QAM SOOO much easier to understand. Thank you!
Splendid video, thank you so much ❤
I would only suggest not showing all plots from the start, but rather fading them in as you talk about them, or alternatively highlighting them in some way. That way it is easier to follow what part of the image you are talking about.
Amazing and clear explanation! Apreciate you for putting your effort on it, congrats!!
I really need to see things visually to understand. This video helped me a lot, thank you very much!
As always, a very instructive video with nice animations. Thank you for your work !
Another question - what is the minimum difference in power that the RX side would detect as a "different state" for power level? It would seem at more complex states like 1024QAM, if there were 10 different states, the percentage would not be linear like 10%, 20%, ... to 100% but rather in a way that puts it consistent with dBm out (and on the RX side, equal spacing of actual received levels). Would love to hear your thoughts on this. Thanks!
Great and helpful visualization and explanation, keep up the good work!
Thanks for the incredible video, it finally made QAM click for me.
I'm pretty sure what you refer to as "Amplitude Modulation" in the beginning is actually Amplitude Shift Keying (ASK) in the context of the modulation signal being a digital signal (which it is here).
It is, indeed
I'm quite confused why OATV does not use the internet to Transfer 4k video and Dolby Soround Sound. Perhaps a big buffer to synchronize the signal, I have no idea. 🤷🏻♂️
what's a negative amplitude? (10:00)
You are Super genius! Best video ever. Thank you! 🙏🙏🙏
I'm mostly curious how it can distinguish between positive and negative phase. It seems like the starting point would matter, because if you are off by half a cycle, you would interpret all of your amplitudes as inverted.
And then the same goes for determining amplitude. I can see how to do amplitude relative to each other, but not how to do absolute amplitude without a 3rd signal for reference.
Where can i find this simulator??
@7:11 Can you please help - I can't find this info anywhere. What differences are they in WiFi in the actual real world? For example, if 1.00 = 10dBm, does .75 = 8.75dBm, .5 (half power) = 7dBm, 0.25 = 4dBm and 0.00 = ? Also, for more complex forms like 1024QAM, would it be 10 difference power level states? Thanks!!
Incredible video, fantastic graphics!
Very good explanations of QAM !!
really good visualization of the process!
Should not the top graphs be labelled A_I(t)cos(2pi*ft) & A_Q(t)sin(2pi*ft) beginning from 11:34?
VERY good explanation!
You are a fuckin legend Dave. What a great explanation.
amazing explanation! thank you for the video
Great stuff. I look forward to scoping your channel. Thanks. Subscribed. Cheers
Fantastic video
Could you explain how to get the filtering signal phase sync'd with the carrier signal ? Is frequency sync also an issue, because maybe there could be slight differences in the freq of the emitter and the receiver.
David, your video helped me a lot to understand more QAM.
What software do you use to make these dynamic graphs?
Thank you very much!
amazing explanation
Very useful bits. Thank you. Subscribed.
How dose ss7 works and ss7 encryption decryption explain
How am I only just finding this channel??
I can't thank you enough!
Hi, I liked very much this video. In real world, how this could be implemented? I guess it is using op-amps. Is there some real world example you could show us? Thank you very much
Brilliant 👍
❤this is amazing
Very good!
thank you
in 2.15: Why A(1- cos) ~ A
Phenomenal
In 8:10 you say, we have 2 possible amplitudes but I think this is wrong. The amplitude in a constellation is the distance from the origin to a point. The plot you showed visualizes QPSK/4-QAM, where the amplitudes should always be the same.
Very nice explanation, thanks a lot! Could you share your source code?
This would be nice!
th-cam.com/video/4cQChi4n1UY/w-d-xo.html for simulation of QAM passband signaling with MATLAB
Desmond Well
❤
Modulation ka spelling galat hai
🤯
Garcia Mark Hernandez Gary Gonzalez Karen
th-cam.com/video/KdLoMi-fIU4/w-d-xo.html for simulation of QAM passband signaling with Simulink