Пікірлер

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  @teem_news9 күн бұрын

  So just to be clear, after the serial to parallel conversion (see 15:29) we do quadrature amplitude modulation but this is NOT actually modulation in the traditional sense of circuitry to modulate? It's more of a mapping, correct? Also, to physically transmit the signal do we have to use the same modulation scheme as the one used in the "mapping" stage?

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  @panduwilantara3070Ай бұрын

  good

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  @Pedro-kj3chАй бұрын

  Amazing! Thank you very much

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  @frankzonta2Ай бұрын

  Nice

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  @zakirullah4088Ай бұрын

  Thanks Mam, very effective lectures in the whole playplist, I am following it to revise the whole course

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  @OGdoCavaco2 ай бұрын

  Thanks Professor

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  @theoryandapplication71972 ай бұрын

  thank you very much

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  @whynot-vq2ly2 ай бұрын

  merci beaucoup

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  @aymanhansali24392 ай бұрын

  merci madame pour ce contenu

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  @penelopejurd70823 ай бұрын

  omg, finally i get it, thanks!

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  @chitralimangol48793 ай бұрын

  Thank you so much Professor for uploading videos about CMA! Before this, I couldn't find any content on CMA on KZread. Your efforts are greatly appreciated. Could you please consider making a video explaining the mathematics behind CMA? That would be really helpful. Thanks again!

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  @choono38914 ай бұрын

  Hi, thank you for awesome video. At 10:27, the fractions inside of Q functions for P_e of BPSK and BFSK looks the same at the end. I think there is a typo for BPSK case.

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  @justicesompo4 ай бұрын

  Great Job! Congrat!

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  @dragosbratfalean32815 ай бұрын

  great video

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  @dougmeredith63917 ай бұрын

  I've been in the business for many years, your teaching methods are awesome.

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  @ceeeb17577 ай бұрын

  the link was invalid in the end of the video . Could you please update the link?

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  @anandk83282 ай бұрын

  please share the link if you get it

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  @teem_news7 ай бұрын

  Dear Professor, thank you for this detailed explanation. I have 3 questions and would be grateful to get responses from you or recommendations for what to read. 1. Is the modulation at the subcarrier level not actual modulation in the sense of varying some aspect of a wave (phase, amplitude, frequency, etc) to embed information? Is it simply a mapping between data bits and our choice of points on the constellation diagram? 2. From the IFFT module we get complex numbers e.g. a +bi. If we use 64 subcarriers, I understand that we would get 64 time samples i.e. 64 different complex numbers. Now how are these 64 complex numbers combined to form a single symbol to be sent? 3. For the actual transmission, does a (real part) modulate the cosine while b ('imaginary') part modulate the sine? in other words, what is the physical process for going from the complex time samples into physical voltage variations that results in RF emissions. The 5GHz oscillator you mention going to be split into one cosine and another sine (90 degrees out of phase), have these individually modulated and then the modulated sine is combined with the modulated cosine before finally being used to induce voltage changes at the antenna feedpoint..? Merci

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  @allenndlovu5177 ай бұрын

  I can never thank you enough for uploading your lectures on the public platform for free, they are truly a goldmine. I was failing to understand communication system since first year at varsity, but through watching your lectures im happy and grateful for the comm. systems intuition and understanding that i have gained.

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  @zakariahamma58937 ай бұрын

  merci madame

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  @thabangcoleen37397 ай бұрын

  This is the explanation I’ve been looking🙌🏾

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  @allenndlovu5177 ай бұрын

  Best explanation, your lectures are top notch

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  @isokmhl46218 ай бұрын

  it is very useful explanation, thank you very much

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  @tobykang8 ай бұрын

  Thanks for the illustration! But seems that the last four minutes of the video is all black has no audio

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  @Mataiyalona21828 ай бұрын

  Much Appreciated Professor.

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  @elijahsmith75528 ай бұрын

  I think it's backwards at 9:46. Ergodic is always stationary but not vice versa. Iaian Explains Signals has a nice video showing this.

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  @janbellenberg72198 ай бұрын

  This is an amazing video! Finally I understand this topic!

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  @user-vw2zc3op2b8 ай бұрын

  I need an English translation to Arabic please ❤

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  @ptsmonvideo9 ай бұрын

  Thank you for these videos. You’re awesome!

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  @mubeenamjad36199 ай бұрын

  Hmm nice try but things are quite complicated then what is presented...but this lays out a very good foundation

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  @user-xv9qk3iz7b9 ай бұрын

  Perfect!

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  @virt_msk10 ай бұрын

  x(t)*delta(t-tau) = x(tau) Isn't it?

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  @2262sandeep10 ай бұрын

  Mam, with your explanations anyone can master the book by Sklar. Is there a place where each page of the book is discussed via a video like it is done here !!

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  @Givyj1310 ай бұрын

  Hey I just wanted to say that, as a network engineer who is trying to learn more about RF without getting neck deep into math and physics, this video was amazing! You explained it in a very approachable way that sitll had a great depth of information.

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  @user-ti7tu9bk3l10 ай бұрын

  Mam, you are so good that I am watching all video even when I am not enrolled 😇🤩 Many Many Many ... Thanks for sharing your knowledge.

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  @user-ti7tu9bk3l10 ай бұрын

  you are no less than God .... many many thanks yr teachings . All your videos make an excellent resource for students.

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  @el_lahw__el_khafi10 ай бұрын

  Thank you so much

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  @bstanis123711 ай бұрын

  Thanks a lot Prof. Leslie; Please, I have very interesting question, I'll so appreciative to you if you have precise answer for it, the question is about how we can theoretically calculate the cut of frequency of the raised cosine filter for OFDM signal (pulse shaping) before driving the IQ modulator for frequency upconversion from baseband to RF carrier? Please, I'm so need your help about that from your experience and deep knowledge in this regard. thank a lot :)

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  @asdrty25811 ай бұрын

  Each s carr is 15khz So 20000/15 is about 1200 carriers in DTV

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  @danielh2833 Жыл бұрын

  very good explanations, thanks!

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  @harry_kim6940 Жыл бұрын

  2023.07.14 감사합니다.

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  @harry_kim6940 Жыл бұрын

  2023.07.14 감사합니다.

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  @harry_kim6940 Жыл бұрын

  2023.08.14 가사합니다.

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  @harry_kim6940 Жыл бұрын

  2023.07.14 감사합니다.

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  @harry_kim6940 Жыл бұрын

  2023.07.14 감사합니다.

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  @harry_kim6940 Жыл бұрын

  2023.07.14 감사합니다.

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  @spicypepper5391 Жыл бұрын

  This is done quite well! Glad to have stumbled upon this lecture.

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  @shengtong6772 Жыл бұрын

  Hi, thank you for your lecturing. However, I think that the code words from state b to state c should be 001 and 101. Please check it. Thanks.

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  @hussamalraie3275 Жыл бұрын

  I don't know why I learned OFDM from another person while there is a great explain like this, really thank you very much.

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  @hocineislamguia8432 Жыл бұрын

  Thank u very well explained

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  @blastinc Жыл бұрын

  Well actually what you are explaining here is CNR or carrier to noise ratio and the relation to eb to no. SNR or signal to noise ratio is something different. CNR and SNR are related but slightly different metrics used to assess the quality of a communication system. CNR is specifically focused on the ratio of the received carrier signal power to the noise power, while SNR considers the ratio of the desired signal power to the noise power. CNR emphasizes the carrier signal, while SNR encompasses the overall signal quality.