So you can understand a telephone system in terms of understanding a relatively small number of principles. You have to know the structure of the input. Here the problems are in this binary interface. I have over-simplified it. electronics and communication engineering study material, nptel videos for electronics and communication engineering, electronics and communication engineering video lectures +91-9600002211 / 044-24321077 (9.30 am to 7.30 pm) Which says that this layering of communication system that we're talking about really ultimately makes sense. That's what digital communication is. So I'm going to try to explain to you why this is important, and something today about what the proper inter-relationship is of engineering and theory. I don't care much whether it takes a second or a minute or an hour to get to this other person. Yeah. You have a sequence of bits coming in, you have a sequence of bits coming out. So the picture is the following. That's the problem with channels. during the lecture. The way you describe sources is how many bits per second do you need as a way of viewing that source. Watch 'Digital Circuits and Systems' Video Lectures ('Electronics and Communication Engineering' course from 'IIT Madras') by Prof. S. Srinivasan - Lecture: 'Shift Registers' But what we've been saying in this layering idea is when you're dealing with source coding you ignore all of that. The problems that we work on everywhere in engineering are toy problems. I can take you through a little bit of a thought experiment which will sort of explain that, I think. The last three weeks of the course is primarily talking about wireless because that's where the problems are most interesting. They don't want to have any idea of what those bits mean. Looking back historically, every time the communication field has seemed dead, and I can think of three or four such times in history, those have been the exact times where it was great to get into the field. There's no signup, and no start or end dates. The bit stream does have a meaning as far as the source is concerned. You also will see that because of the big bust in the year 2000, there's much less commercial activity in the communications field now. Please review the probability that you are supposed to know because you will need it very shortly. Send to friends and colleagues. Moore's law says every year you can put more and more stuff on a single chip. Because the packets are long and because the packets are long because they include a lot of data, you have a little bit of end effect about how to start it, a little bit of end effect about how to end it, but the main structural problem you'll be dealing with is what to do with the whole thing. Then this bit stream gets presented to the channel. Something that most teachers don't understand. This is a distinctly information theoretic idea, because communication used to be involved with studying different kinds of wave forms. All published courses MIT 6.450 Principles of Digital Communications I MIT 6.013 / ESD.013J Electromagnetics and Applications MIT 4.367 Studio Seminar in Public Art MIT 21F.034 Media, Education, and the Marketplace MIT- 2.993 Spec. Test Series Mentorship. And I kept worrying about this and saying well the stuff I'm doing is fun and I enjoy doing it, but why should anybody pay me for it? A guy by the name of Hamming became very famous for generalizing this just a little bit into another single error correcting code, which came through at a slightly higher rate but still corrected single errors. Then you go down to this point. He had these ideas turning around in his head for about eight years while the second World War was going on. We will understand what that distinction is as we go on. You know what a blinking 12 is. They often don't work or are not robust. Anything which lasts for a finite amount of time spreads out in bandwidth. So by increasing m, I can decrease the bandwidth, by increasing m, I can reduce the bandwidth, but by reducing the bandwidth, the power is going up. Introduction to Wireless Communications. There are more than 350+ Video Courses, more than 12000 video lectures across 10 subjects. That's when you're using system design, because in system design you can never understand the whole thing. If you build a new product that sends 9,600 bits per second, which was a major technological achievement back in the '70s and '80s, suddenly your company becomes a very important communication player. 1 into 1, 1, 1. Most of us have become blinking 12's. Unlike a traditional book, this text contains the theory of both analog and digital communication systems supported by simulations (MATLAB & Mathcad) and video lectures referenced throughout the chapters. Channels include oral means such as telephone calls and presentations, and written modes such as reports, memos, and email. The non-robustness is the worst part of it. Knowledge is your reward. So the exercises that we're going to be doing are really aimed at understanding these simple models. Digital Systems Design - Prof. D. Roychoudhury 20. Unlike a traditional book, this text contains the theory of both analog and digital communication systems supported by simulations (MATLAB & Mathcad) and video lectures referenced throughout the chapters. People earlier had figured out they could do that with the sampling theorem, but the sampling theorem wasn't very practical, but Nyquist's way of doing it was practical. It doesn't have any meaning as far as the channel is concerned. 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