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@WiltonHoward 10 сағат бұрын
Always enjoy watching your videos Iain... learn something every time. Rgds, Howard W.
@iain_explains 7 сағат бұрын
Glad to hear it! Thanks for letting me know. It's always great to hear from viewers who like the content.
@mohammedabdulzahraahmedeshaqal 11 сағат бұрын
I always watch your videos they honestly amazing and the way you demonstrate is so great, however I am looking forward to watching anything you could do it about FBMC especially its channel estimation
@iain_explains 7 сағат бұрын
I'm so glad you like the channel. And thanks for the topic suggestion. I'll add it to my "to do" list. In the mean time, you might like to watch the following video, which explains the effect of the pulse shaping (D-to-A) filter in OFDM, and shows that if you choose the filter (g(t)) to be a sinc function, then you can get rid of the sidelobes in OFDM - which is basically just what FBMC is doing: "How are OFDM Sub Carrier Spacing and Time Samples Related?" kzbin.info/www/bejne/oZ_NloulaLuNrMU
@mib32 13 сағат бұрын
5:30 abberations ;)
@ako-math 14 сағат бұрын
Thank you for these great videos. How are these windows and their duration chosen when one examines actual occupied band of a communication system? If we are given 20Mhz bandwidth for 5g, and have a freedom of choosing the window duration, and signal is dynamic in time, how is judgment about actual physical presence of spectrum at a given time made?
@iain_explains 8 сағат бұрын
When signals are random (or "dynamic in time" as you put it), we look at the "power spectral density". It can be thought of as an 'average Fourier transform energy". Here's a video on that: "What is Power Spectral Density (PSD)?" kzbin.info/www/bejne/eqC2fYB7etRkj5I
@pitmaler4439 18 сағат бұрын
You said when there are 2 frequencies, theiy could canceling out. I just know that canceling from the time domain - but that is here also possible in the frequency domain? Do you mean after the convolution of the rectangular and ther 2-frequencies-containing-pattern in the freq.-domain?
@iain_explains 8 сағат бұрын
Actually, I didn't say "cancelled out", I said "swamped". What I meant was, that if the amplitude of the second frequency component is smaller than the amplitude of the side-lobe of the main frequency component, then it will be hard to decide whether the second frequency component is actually in the signal, or not.
@xxgoku7774 Күн бұрын
Hello, ive got a question, and I am sure that you are the best one to ask suppose ive got this transfer function F(s) = 1/(s+1) so the phase function is equal to p(w) = - arctan(w) and the time delay is 1/(1+w^2) and then w = 1rad/sec, p(1) = 135º and T(1) = 1/2 seconds What does it mean? What does T(w) represent?
@VeritasiumOP Күн бұрын
Love from india ❤️ I hope you overcum your chota lund problem really soon. Its getting inexpensive in India. Costs around 5 Lakhs (6k USD) for surgery.
@jeba992001 2 күн бұрын
after 9:21 video jump to out of focus may be he is working on imaginary axis.
@daviddawkins 2 күн бұрын
Really interesting, thank you! Am I right in saying that's just one of the original waveforms that could have produced those samples? I guess we're saying that the sampling rate defines the highest frequency we care about and that everything above it is considered noise?
@iain_explains 7 сағат бұрын
It's not the "highest frequency we care about", it's the highest frequency that can be captured during the sampling process and then reconstructed from the samples. This video should help: "How to Understand Aliasing in Digital Sampling" kzbin.info/www/bejne/r2i4gISVlqtseZI
@laalbaalti 2 күн бұрын
mits wale aagaye
@daviddawkins 2 күн бұрын
How is that peak at T/2s reconstructed digitally, if the surrounding two real samples have the same value?
@iain_explains 7 сағат бұрын
This video should help: "How are Signals Reconstructed from Digital Samples?" kzbin.info/www/bejne/mnWceXZnfLmbkLs
@Pulsonar 2 күн бұрын
Very informative, I like the way you dive into the mathematics of it all as if its just tea and biscuits ;) As soon as maths notation comes into view Im done for. Im just thankful as an engineer I often figure problems and solutions from a practical perspective to 'cheat sheet' my way around the maths for most part, and my intuitive solution matches the final maths result. Good work.
@polestar-co3vf 2 күн бұрын
excellent explain！
@iain_explains 7 сағат бұрын
Glad you think so!
@Glorious-ro6yb 3 күн бұрын
Thanks so much.
@iain_explains 7 сағат бұрын
You're welcome!
@onemanenclave 3 күн бұрын
My takeaway from this video is that it's magic. That's the truth *they* don't want you to know: it all boils down to black sorcery 😂
@meerrafathali7951 4 күн бұрын
are the multiple signals coming from multiple users or different users?
@iain_explains 7 сағат бұрын
"Multiple users" are "different users".
@WilliamDouglasHenry 4 күн бұрын
Great video! What are the axis though for the discrete fourier series ?
@iain_explains 4 күн бұрын
I'm not sure what you mean. The left hand side graphs in the video are time axes.The right hand side graphs in the video are frequency axes.
@theodoremercutio1600 4 күн бұрын
A well-presented video! I've been thinking about creating some math content of my own. Would you mind telling me how you go about setting up your recording equipment? Can my phone get the job done or do I need to invest in a camera? Do I need a tripod? Much appreciated!
@iain_explains 4 күн бұрын
This video includes my basic setup: "Behind the Scenes: A Solution Based Approach to Learning and Teaching" kzbin.info/www/bejne/nnKci353qb50etU
@Crazybky..0303 4 күн бұрын
Thank you sir. Great explanation.
@iain_explains 4 күн бұрын
Glad you liked it
@laughingtweets 5 күн бұрын
we can double the data rate by doubling the transmit power with condition that MODCOD is same but at the cost of BW for sure.
@sophiacookie437 6 күн бұрын
The best explanation ever ❤ I finally understand….🎉
@iain_explains 5 күн бұрын
Glad it was helpful!
@Catherine-x9m 6 күн бұрын
1st year phd student, you really saved my life! Thank you!!!
@iain_explains 6 күн бұрын
That's great to hear! I'm glad you found my channel.
@ArthurMack-u9n 6 күн бұрын
This is a great video, very creative way to explain a concept that can get confusing.
@iain_explains 6 күн бұрын
Glad you liked it
@SachinChavanshree 6 күн бұрын
Hi, cisco AP supporting MIMO, for 4x4 mimo configuration how many onmi antennas will be required 4 or 8
@laughingtweets 6 күн бұрын
Hi prof. Which book do you recommend to read for these concepts?
@iain_explains 6 күн бұрын
J.G. Proakis, “Digital Communications”
@laughingtweets 5 күн бұрын
@@iain_explains thanks
@ZvikomboreroGandidzanwa 6 күн бұрын
Amazing video - thank you🙌
@iain_explains 6 күн бұрын
Glad you found it helpful!
@deerajkumarj1408 7 күн бұрын
Sir, according to C=Blog(1+SNR), we say that by doubling the bandwidth the capacity increases and thereby the maximum rate also gets doubled. But what is the intution behind this? By increasing the bandwidth how will we able to increase the data rate? Sir, is there any intuitive way to understand rather than from the capacity equation of AWGN channel. Thank you in advance sir
@iain_explains 6 күн бұрын
Hopefully this video helps: "How are Data Rate and Bandwidth Related?" kzbin.info/www/bejne/kHO2p4CYhJWghrM
@deandevilliers2799 7 күн бұрын
wild right hand rule appears!
@Kola-Nandhini 7 күн бұрын
Explanation 🙌
@iain_explains 7 күн бұрын
Glad you liked it.
@brittanymounce8748 8 күн бұрын
(s^2 + 5s + 10) does not factor out to (s+2) & (s+5)
@iain_explains 7 күн бұрын
So I'm guessing you didn't read the note I previously added in the description for the video. Nobody's perfect.
@zeyadalabsy7332 8 күн бұрын
So, based on my understanding for you explanation, the sensitivity to doppler effect should be critical in higher index of OFDM subcarriers, right? For example, when using the number of Subcarriers N = 1024, at subcarriers i.e. 1, ... 128 out of N, the data can be recovered at such doppler effect while data carried via subcarriers N-128, .... N will be much more affected. Is my conclusion right?
@iain_explains 7 күн бұрын
Not really. The spread of frequencies across the subcarriers is only a very small fraction of the carrier frequency.
@zeyadalabsy7332 7 күн бұрын
@iain_explains Yes, I agree about that. What I mean is the error percentage at data carried via subcarriers located at the beginning of the symbol is supposed to be less compared to the data carried via the subcarriers at the end of the same symbol.
@bunty55555 8 күн бұрын
Great simplified explanation ...thank you Professor :)
@iain_explains 7 күн бұрын
Glad you liked it!
@sarangkumarsingh7901 8 күн бұрын
❤
@ibrahimshikdaher7551 9 күн бұрын
Unfortunately such kind of conferences conveys a lot of negative energy, because it's the research and business to kill innocent people around the world 😢
@hamzak.741 10 күн бұрын
This right here, is premium content that people should pay to watch. The fact that I saw this for free increases its value even more. Thank you, Mr Iain.
@iain_explains 8 күн бұрын
I'm so glad you liked the video. Hopefully you've found my webpage which lists all the other videos I've made, in categorised order. iaincollings.com
@osamasaeed7743 10 күн бұрын
woow so good to understand the MAP and ML
@iain_explains 8 күн бұрын
Glad it was helpful.
@rajeswarbanerjee2578 10 күн бұрын
So cool!😍
@abidbhat3428 11 күн бұрын
thanks for the explanation, but how does ofdm estimate channel when we are talking on a phone in a moving car?
@haiannguyen903 11 күн бұрын
thank you a lots❤
@iain_explains 8 күн бұрын
I'm glad you found it helpful!
@youssefmaghrebi6963 11 күн бұрын
What are the things in the ground called ?
@yyt223nyu 11 күн бұрын
After watching the two episodes in this series, I also went back to watch your previous videos on beamforming theory-really practical and helpful! I’m very excited to see what comes next… will there be an episode on MIMO in practice?
@iain_explains 8 күн бұрын
I'm glad you like the videos. I'm still looking into what else I can demonstrate with this equipment.
@writetube 11 күн бұрын
Very well explained! Thank you!
@iain_explains 8 күн бұрын
I'm glad you found it helpful.
@alaasefa1118 11 күн бұрын
wonderful and so simple. you are a remarkable doctor😍
@iain_explains 8 күн бұрын
I'm so glad you like the video.
@abidbhat3428 11 күн бұрын
Thanks for the visualisation professor. at 2:58 we multiply our baseband signal with carrier wave because antenna resonate at that frequency but in FSK modulation the frequency changes, so how does the antenna transmit it, and how do we send a band of frequencies
@VerveLife 11 күн бұрын
Thank you sir. The best explanation I ever found
@iain_explains 8 күн бұрын
Glad it helped.
@張雅淳-m8k 11 күн бұрын
The video is very helpful❤ Thank you for sharing this good video ☺️
@iain_explains 8 күн бұрын
I'm so glad you liked it!
@sugard8099 12 күн бұрын
Great video! For the longest time I really had no idea what a convolution was in class and this really helped visualize it! Now onto Fourier Series!
@iain_explains 8 күн бұрын
I'm so glad it was helpful! Hopefully you've found my webpage that lists all the videos in categorised order 0 including Fourier and other topics: iaincollings.com
@ECE_Naveed 14 күн бұрын
Thank you for the video, 1 humble request, can we get some videos on markos process, rewards, guass markov process etc.
@iain_explains 13 күн бұрын
Thanks for the suggestion - I've got it on my "to do" list.
@drewwollin3462 14 күн бұрын
Very good. I am quite intrigued by beamforming. I am a radio amateur, so have limited resources. Is there hardware and software around to do beamforming at a lower microwave frequency, say below 6 GHz? I do appreciate that antenna size increases. Drew VK4ZXI
@iain_explains 13 күн бұрын
I'm sure there are, but I'm not aware of them, sorry.
@youssefmaghrebi6963 11 күн бұрын
Just trying to help you with an advice : from what i have understood, you want to operate a radio channel on a specific frequency. If you want to broadcast to users, beamforming is not for you. Because you will focus the strength of the signal in one direction. If you're not sure the users are waiting in that direction, then no one will receive the signal.
@kylearigo2300 14 күн бұрын
Wait i got a question, if 2/5 people use the wifi every other day and that they're seperate, wouldnt that make "P (x=1) = 1/2"? Since there is a 50,50% that one of them would use the wifi?