How are Throughput, Bandwidth, and Data Rate Related? 

I as a Telecommunication Engineer like your videos very much. The way you put the information together is time saving for a lot of viewers Thank you

Short, concise yet retains all of the info needed! Your channel deserves more attention!! Best of luck

Very clear and informative

Huge thanks from South Korea :)

Awesome Explanation

Clear and concise description and basics with good explanation ! Loved it ! Thanks.

Great Explanstion So lucidly and concisely elucidated. Thanks Sir

It is super useful to me. I am an engineer at communication system company in Taiwan and do service for HP in USA. We do a lot of Throughput measurement here. And now I know what is going on here.

Viewers mind (who is watching) as a communication channel with lots of noise from other RU-vid videos (with unclear content in the same context) and your brief explanation as the IEEE802.11a protocol with highest throughput for beginners. hahaha excellent work.

This is such good teaching, thanks Iain. I have studied this topic from both an engineering and a computer science perspective. Very interesting. Really appreciate the explanation of how to construct the equation!

Very helpful and informative!!!

Great explanation. Thank you.

Thank you… great explanation!

Thank you for this interesting video. I really appreciated it!!!

Wow this is great stuff thankyou!

Thank you very much, Sir, for your VDO. At the baseband (before multiply by the carrier frequency) , is there the negative frequencies? Because when we multiply by carrier, we will have both side band shifted, if it is there.

nice

hello Mr what is the definition of air interface latency?? and THX

Huge thanks from North Korea

Thank you so much for the great and eye-opening explanation. Just a quick question, in which block is the source coding done?

Hello thanks for this video, I have a question if my wireless Access Point is operating on 80MH bandwidths and if I change it to 40MHz will my average throughout go down ? From your video it seams it would go down as per formula throughout is directly proportional to data rate and data rate will go down with Chang in bandwidths. Please clarify

Thank you for your presentation I have a question , How can I calculate the ARQ retransmission rate and the TCP retransmission rate?

Thank you for the video . It was very insightful . However ,I did not understand that after dividing the total bandwidth (20Mhz) by 64 ( # of sub carriers) we get 312.5 KHz . Subsequently you wrote symbol rate is 1/312.5 Khz . My question here is that how symbol rate is related to the bandwidth ? For example consider a binary symbol for 10 millisecond duration . The Fourier transform of that will be a sinc function with main lobe width of 2/10 ms . Inverse of that is 5ms . So if we inverse the bandwidth we get lesser symbol duration. But in your case you took the inverse of subchannel bandwidth and symbol duration is specified as inverse of that (3.2 microseconds) . Can you comment on whether my understanding is correct or Am i missing something ?

Superb video Iain. Greetings from Spain! Just one comment, I prefer to calculate data rate with Nyquist formula, you know: Vmax = 2*B*log2(V) so with your example it would be = [2*312,5*log2(6) ]*48*3/4 = 56 Mbps. :D

Very informative video. Love your videos sir. I have a question, how do I get the details formula of this throughput formula? like how to get the value of MAC contention rate, ARQ retransmission rate to get the throughput value? thank you sir

Hi Iain. Big fan, your videos are very very good. Can you please make a video on bits per symbol??

Very Informative video it is! but I'm having some confusion. Why are you taking 64 subcarriers at one place and 48 subcarriers in the other? Doesn't legacy LTE with 180 kHz bandwidth only can carry 12 subcarriers of 15 kHz size?

Hi Ian, thanks for this video. Why symbol rate is not used in the data rate formula? Wouldn’t the data rate be symbols/s x bits/symbols x # of subcarriers? 6:05

Thanks for the video. I have some queries : 1) FEC is alternatively named as channel coding? 2) Is not HARQ a part of MAC layer? why have you put it as a différent layer between MAC and IP? 3) You mentioned about two factors while calculating the throughput. a) MAC contention and b) due to ARQ that you described to be linked to the channel. Not very clear about their distinction. Can you please explain again? The factor linked to ARQ is there because it means retransmission of the same packet that effectively reduces the throughput ? If yes, then this can be due to MAC congestion, no?Or what I am saying is true for MAC HARQ which is different from ARQ mentioned here ? Does ARQ mentioned here indicate the Radio link layer ?

Sir, would you please explain why symbol rate equals bandwidth?

Very informative video , thanks . You mean GoodPut = throughput + L2+L3+L4 overhead.?

One Question: How can we attain the "packet error rate" by having the "symbol error rate", considering FEC? Suppose, the packet has 10 symbols, and SER is 10^-5. Then, the packet error rate will be [(1- 10^-5)^10] without having FEC. I cannot, unfortunately, calculate that rate when we have FEC.

in general the BW is 2/symbol_duration, but why is BW = 1/T in ofdm?

The math at time 4:08 for bitrate calculation for 802.11 wifi seems to be not giving 54mbps. Anyone tried calculating and share the formula if worked.

Can I request you create a video about HARQ?

Excuse me.I have a question for why the time duration of cyclic prefix is 0.8ms

I don't get why you used 48 sub-carriers to calculate the data rate? If it's not because of the headers, then why?