That's why such people become professors in the first place: they know how to talk such that it sounds important but at the same time no one understands what they are saying. So everyone gives up and just lets them to get the job
Lol!! Unfortunately or fortunately, TEACHING is talent plus skill. Your professor both have the knowledge but presentation or teaching skills are not the same.
Quick notes: Modulation describes the process of representing digital signal in physical form. ASK: High Aplitude writes 1, low amplitude writes 0 FSK: Higher Frequency writes 1, lower frequency writes 0 PSK: A phase change basically means a switch - you either switch to start sending 1s or 0s - you write the same value until you "switch" again
I dont usually comment on videos, but this is a great explanation. Keep up the good work. I'm a big fan of your explanations and visuals. Super helpful. Thank you!
I appreciate your comment, Eric. Thank you very much for your encouragement. I will try my best to upload more videos, one by one. I hope by the end of this year, I would complete my plan: 70 more videos in networking and cyber-security. Please come back to my channel. Thank you again, Eric.
This is extraordinary pedagogy. You make it seem so simple, but the average person who is knowledgeable in radio wave technologies would be wholly incapable of communicating AM/FM/PM in such an accessible manner. Thank you very much.
Really great work you are doing while explaining these complex topics with so much simplicity, conclusively it gave me the confidence that it was merely a common sense. You are really a great teacher and you really have a deep understanding of the subject.
Awesome! With PSK however, I can't seem to imagine how it would be possible to abruptly shift a wave's phase by 180°!? Wouldn't that introduce massive amounts of side-banding every time it is done?
hi, i need to know a data modem with 2gfsk & 4gfsk modulation to be not loose speed in amplifier connection needs the same modulation supporting from amplifier i have read..if the amplifier is only says gfsk supporting the 2gfsk & 4gfsk without diference in total data speed or not?
Could you please include some of the digital modulation techniques like DM,DPCM,DPSK in a short and brief video. And also digital coding techniques in another video.
Hi, easy and comprehansible explanation, still you could have skipped first 2 minutes. Someone who whants to find out something about shift keying, they already know what frequency and amplitue are. :)
how about advantages and disadvantages among the three and how do they fit in different wireless standards, ie: LTE, 5G, (tdma, fdma, ofdma, fdd, etc.)
%% S_3 close;clear;clc; f1=3; % Birinci Tasiyici Frekans f2=7; % Ikinci Tasiyici Frekans fs=1000; % Ornekleme Frekansi ts=1/fs; % Ornekleme Periyodu bits=[1 0 1 1]; % Veri Dizisi n_bits=numel(bits); % Veri Dizisinin Eleman Sayisi FSK=zeros(fs,n_bits); % Dongu Icin Gerekli Alanin Acilmasi for i=1:n_bits % Veri Dizisinin Eleman Sayisi Kadar Dongu t = (i-1):ts:(i-ts); % Her Bir Simgenin Suresi if bits(i)==1 % Eger Veri 1 ise f Frekansinda Simge fsk=cos(2*pi*f1*t); else % Eger Veri 0 ise f2 Frekansinda Simge fsk=cos(2*pi*f2*t); end FSK(:,i)=fsk'; plot(t,fsk); hold on; grid on; axis([0 n_bits -4 4]); end FSK=FSK(:)'; % Yatay Matris Olusturulmasi xlabel('Zaman') ylabel('Genlik') title('Ikili Frekans Kaydirmali Anahtarlama (BFSK) Simgeleri') %% S_4 FSK=awgn(FSK,0,'measured'); points=zeros(1,n_bits); % Dongu icin gerekli alanin olusturulmasi for i=1:n_bits % Veri Dizisinin Eleman Sayisi Kadar Dongu t = i-1:ts:i-ts; % Her Bir Simgenin Suresi out1=FSK((i-1)*fs+1:i*fs).*cos(2*pi*f1*t); % FSK Isaretinin Birinci out2=FSK((i-1)*fs+1:i*fs).*cos(2*pi*f2*t); % FSK Isaretinin Ikinci val1=trapz(t,out1); % FSK Isaretinin Birinci Tasiyici Uzerine val2=trapz(t,out2); % FSK Isaretinin Ikinci Tasiyici Uzerine points(i)=val1-val2; % Cikistaki Degerlerin Farkinin Alinmasi end decoded_sym=sign(points); % Cikisin Signum Fonksiyonu ile (−1,1) Araligina decoded_bits=(decoded_sym+1)/2; % Cozulmus Bit Dizisinin olusturulmasi disp(' Alicida Cozulen Bit Dizisi :'); disp(decoded_bits); figure stairs(0:n_bits,[decoded_bits decoded_bits(end)],'b','LineWidth',1.5) % Hat Kodu Olarak Cozulen Dizinin Gorsellestirilmesi axis([0 n_bits -2 2]); hold on stairs(0:n_bits,[bits bits(end)],'--','LineWidth',2); xlabel('Adim'), ylabel('Bit Degeri'), title('Alicida Cozulen Bit Dizisi') grid on, legend('Çözdüğümüz Bitler','Gönderdiğimiz Bitler');
%% S_3 close;clear;clc; f1=3; % Birinci Tasiyici Frekans f2=7; % Ikinci Tasiyici Frekans fs=1000; % Ornekleme Frekansi ts=1/fs; % Ornekleme Periyodu bits=[1 0 1 1]; % Veri Dizisi n_bits=numel(bits); % Veri Dizisinin Eleman Sayisi FSK=zeros(fs,n_bits); % Dongu Icin Gerekli Alanin Acilmasi for i=1:n_bits % Veri Dizisinin Eleman Sayisi Kadar Dongu t = (i-1):ts:(i-ts); % Her Bir Simgenin Suresi if bits(i)==1 % Eger Veri 1 ise f Frekansinda Simge fsk=cos(2*pi*f1*t); else % Eger Veri 0 ise f2 Frekansinda Simge fsk=cos(2*pi*f2*t); end FSK(:,i)=fsk'; plot(t,fsk); hold on; grid on; axis([0 n_bits -4 4]); end FSK=FSK(:)'; % Yatay Matris Olusturulmasi xlabel('Zaman') ylabel('Genlik') title('Ikili Frekans Kaydirmali Anahtarlama (BFSK) Simgeleri')
Do I need the same sine wave signal at demodulator generated at modulator end to extract the digital binary data or I can use same frequency sine wave signal generator at demodulator to decode the data . Please guide. An early response will be highly appreciated. Take care stay safe.
thank you for your videos, they are very helpful. but why this is better? to me it seems the same technique like analogue . how it comes that this is better ?
