Lec 1 | MIT 6.450 Principles of Digital Communications I, Fall 2006

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Lecture 1: Introduction: A layered view of digital communication
View the complete course at: ocw.mit.edu/6-450F06
License: Creative Commons BY-NC-SA
More information at ocw.mit.edu/terms
More courses at ocw.mit.edu

Пікірлер: 98

@karanbhatia6712 5 жыл бұрын

This prof is Robert G. Gallager, the inventor of LDPC codes used in Wifi, Dvds and more recently 5G communication system. This blew my mind! The things I am gonna learn are made by this gentleman itself. This shows why MIT is the top institute in the world.

@japs13 15 жыл бұрын

One of the few professors, in my experience, who still implements philosophy into his lectures. Great professor.

@shethtejas104 3 жыл бұрын

I was watching random videos on youtube and wasting my time replying to abusive comments. Then I realized, being a digital communications engineer, why not search related videos. I found M.I.T videos for free. This is what resurrection feels like. Internet CAN be very good too. Depends on how you spend time with it. Thank you MIT :)

@7aydarah 6 жыл бұрын

I'd been watching the series of thos videos in 2009 for studies purpose when I was working on Reed-Muller codes. And now, after 7 years, when I started working on LDPC codes, I realize that this guy is the father of LDPC codes. What an ignorant am I !!!! Thanks a lot Professor Robert Gallager. All my respects.

@shahjahanali9645 6 жыл бұрын

Excellent Lecture by the Great Professor. I wish I had a teacher like him. Long live professor.

@Beatriz-ht4ys Жыл бұрын

He's teaching the learner how to think. I LOVE MIT. Please don't be tired to share what's on your imagination.

@suhailski 15 жыл бұрын

This is a wonderful course. Prof Galleger is such an inspiring and engaging teacher. Two thumbs up!

@engrumarkhan 12 жыл бұрын

7 Year in wireless communication but still much to learn from Prof Galleger lecture! Thanks

@yukeyang9643 7 жыл бұрын

great thanks to MIT,thank you for sharing these amazing lectures.

@cunningshark 6 жыл бұрын

best wishes to this old man, thank you for your work and your humor (btw you are not robbing :D)

@ChrisAldrich1 14 жыл бұрын

@donnyab Yes! Indeed. This is a fairly advanced subject which generally isn't gotten to until one's senior year of university or more often in a master's program. If you want to be prepared to understand it all, you'll need to be able to understand all of those prior subjects. One can always watch the videos and do their best, but if you're going to put in the work, you may as well put in the work.

@Ankit5311 10 жыл бұрын

lifeChanging perspective on Engineering ::: thank u MIT to share

@MakeSushi1 8 жыл бұрын

I like these videos

@kush1161 9 жыл бұрын

thank u MIT...really great thing 4 world u r giving

@footballover01 15 жыл бұрын

he is really a great teacher, and that's wut really makes MIT an excellent place for education :)

@smfarzaneh 4 ай бұрын

such a gem! I'm teaching this and these videos are invaluable.

@eloymarquez4783 8 жыл бұрын

THANK YOU MIT!!! I use your materials for teaching my students.

@oneforallah 7 жыл бұрын

while there are great teachers like the ones at mit and good ones like yourself, in India there are just plain crappy, shitty teachers who don't give two shits about generating students interest in the topic. They bring in some 1980's bunch of shit notes they had written and encourage rote-learning. Whats even more interesting is that my classmates all just jump right into the "who can rote learn the most without understanding a damn thing" competition and I'm just plain sad at how potential is wasted in my country due to its crap education system. You try to teach from the best, good for you !

@mikemcdonald5147 6 жыл бұрын

thats cheating

@shivamparashar6334 5 жыл бұрын

@@mikemcdonald5147 actually its great

@ggonjon 14 жыл бұрын

Online Education can become extremely boring. We miss the teachers, the tone of voice, the body language. And also those stories that good teachers share with their students. But thanks God for these on-line lectures. They are awesome!

@ixisuprflyixi 15 жыл бұрын

I like to listen to this gentleman talk.

@alirezazaeemzadeh9610 4 жыл бұрын

Really good stuff, if you already have a good background on the subject, which is the target audience of the lectures. Otherwise, I recommend you to first take a look at some of the other ocw materials such as linear algebra, signals and systems, and random processes.

@notadyhug 8 жыл бұрын

Thumbs up if you think the Prof. looks just like Warren Buffett. Great course, Thanks MIT Open Course Ware!

@Sagias 15 жыл бұрын

Really inspiring lecture. He is a great scientist and teacher.

@iammouliroy Жыл бұрын

I am so motivated after seeing this.. thank you Sir :)

@dmswanson5694 6 жыл бұрын

Actual understanding without of the obfuscating fussy-stuff; that is, both feet on ground, clear vision as is to what is what and why. Actually useful, applicable. Thank you, thank, you, and thank you MIT. Also, I would credit the excellent professor presenter but I can't find his name; still, that particular person, thank you, sir.

@mitocw 6 жыл бұрын

We glad this lecture helped you! Thanks for the shoutout. :D The Professor's name is Robert Gallager. More info and materials for the course can be seen at MIT OpenCourseWare at ocw.mit.edu/6-450F06.

@icmetlist 12 жыл бұрын

Great lecture!!! Thank you for posting.

@telecom3480 7 жыл бұрын

thanks MIT

@FatimaHassan-fn1vk 6 жыл бұрын

I still dont get the part where he said "theoretists state that 2^100 nos would be evenly spaced and between the values of 0 and 1"Wont the values be exactly zeros and ones and not decimal points?

@pratiktata3388 6 жыл бұрын

what a pleasant and charming Prof.

@JoaquimSalaFayos 12 жыл бұрын

Thanks, very good explanation. Regards from Spain!!

@hw7channel571 2 жыл бұрын

Great lecture, Author and lecturer.

@yk2901 8 жыл бұрын

this man is amanzing

@mastodans 6 жыл бұрын

I enjoy the aside about Hamming at 1:06:08

@AyushBhattfe 6 жыл бұрын

first 20 to 25 mins of this lecture is pure philosophy.

@ReadWithTshepho Жыл бұрын

Philosophy 101. As prof did say that he is a theoritician...that is...philosopher-engineer.

@ChrisAldrich1 14 жыл бұрын

You should try working your way through Oppenheim/Wilsky's Signals & Systems and something like John G. Proakis' Digital Signal Processing as preparation to this course. Berkeley has some good video lectures on the Signals and Systems stuff. Having a good background in Probability Theory will be helpful as well.

@tchi38 11 жыл бұрын

Journalism major! Great video :)

@michaelarson9616 3 жыл бұрын

Woow. thanks from course it halped my busines.

@romoonli2315 9 жыл бұрын

thx,it is what I exactly need,there is nothing in the GFW.

@vishwapriyagautam8227 4 жыл бұрын

Very enthusiastic spirit

@patnafs 14 жыл бұрын

Brilliant!

@gilmaro84 11 жыл бұрын

very good lecture...cheers..

@salimabelhadj422 4 жыл бұрын

Great Professor

@nataliaah5114 14 жыл бұрын

@christopherjaldrich thank you ^^.

@davyboy696 8 жыл бұрын

TVP is point of vacuumtube ET3103 trs. old technology...

@jimmybuffet4970 3 жыл бұрын

He was right. Rapid evolution in the telecommunications industry. Gone are GSM, TDMA, CDMA and HSPA. Now, LTE is on the chopping block in the next several years as 5G NR is fully deployed.

@norliegh 6 ай бұрын

You were right about 5G NR bands! : )

@kush1161 9 жыл бұрын

great sir

@kbaafi 8 жыл бұрын

this man is just amazing

@sanjaypatil2532 3 жыл бұрын

Too late, a decade, to this channel :) Watched only 25 mins n i got 2 thinkin bout his statemt "channel does not know what it's transmitting". Back in the days of Telegram and Postal-messages, the messenger knew the message and announced it to the recipient (Happy B'day). Telegraph operators too knew the reason for the calls...what a contrast to the modern day communications. Thought I'd share :)

@mattdistad 10 жыл бұрын

haha he said Jigabits, Great Scott!

@nathanielkilmer5022 2 жыл бұрын

This was filmed in 2006, the first iPhone was released in 2007.

@mpreyye 6 жыл бұрын

This course scares me

@james77011 Жыл бұрын

Does anyone know what book he is teaching from

@mutex1024 2 ай бұрын

Principles of Digital Communication by Gallagher.

@user-ht6nr6wz5w 11 жыл бұрын

it would be great to have subtitles with these amazing lectures! is that in the plan? it would be very useful for me because of my bad english. it is much easier with subtitles. just transcript (without synchronization) would be enough for me! thank you anyway!

@abkt3839 5 жыл бұрын

Now it has subtitles, 6 years later! Thank you MIT!

@marinvorspier7528 3 жыл бұрын

@@abkt3839 im new in this lecture... so thx u MIT xD

@nataliaah5114 14 жыл бұрын

I would like to be able to follow this course, but am a bit worried about the prerequisites. Does anyone know of a good course I could take a look at to be ready for this one?

@Verschlungen 4 жыл бұрын

23:29-23:41 "When you talk about information theory, it's a total misnomer from the beginning. Information theory does not deal with information at all. It deals with data." Thank you!! That made my day. I've been saying exactly that for years, and wondering all the while why this crucial distinction is mentioned nowhere, EXCEPT on the very first page of Shannon's famous technical paper, which nobody reads. Physicists in particular have a way of sailing right past the data/information distinction, presumably because they are smarter than everyone else (true, I don't deny that they are) and so they feel that they needn't ever slow down to wonder if perhaps they aren't spouting very clever but very idiotic nonsense, e.g., about 'the information in a black hole'.

@marinvorspier7528 3 жыл бұрын

what Shannon's famous technical paper u are taking about? i want to read it too xD

@Verschlungen 3 жыл бұрын

@@marinvorspier7528 Hi. I was referring to his paper called 'The Mathematical Theory of [data] Communication' (1949), which started out as a technical paper inside Bell Labs in 1948. I put '[data]' in the title to emphasize that his paper is NOT about 'information'! As a small paperback book, look for C.E. Shannon, W. Weaver, The Mathematical Theory of Communication, University of Illinois Press, 1963. Shannon's paper appears on pp. 31-125 of that volume. On the very first page of his paper (p. 31), he says, "These semantic aspects of communication are irrelevant to the engineering problem." In other words, he is trying to warn the reader that the paper is about the low-level technical details of data communication, not about 'high-level' information stuff. But for 70 years, people have been ignoring his warning and instead have promoted the fairy-tale that there exists "a theory of information" devised "by Shannon." There is no such theory.

@juandefs 2 жыл бұрын

Well.. i guess ill come back once i complete 6.041 then..

@tomlynd8836 7 жыл бұрын

It would be very helpful to add the title of lectures rather than the number.

@mitocw 7 жыл бұрын

As of May, 2012, all of our videos include the title of the lecture. There are currently no plans to change the thousands of videos before that date.

@nangbutinang 14 жыл бұрын

simply a smart ass lecture..may god bless u

@umarrashid4893 4 ай бұрын

Good to have some of your best thing to say about Pakistan journal of history of the United states in a shop o a lot more than the first time the first two countries has a function that will check in a lot more information on the other sites

@pritomsarker8761 Жыл бұрын

19:20 no claps for this gold here?

@danishfella 13 жыл бұрын

"If you design a system and you don't see in your mind how the whole thing works, you will end up with something like Microsoft Word. And that's the truth!"

@1412dante 4 жыл бұрын

and what's wrong with microsoft word?

@ReadWithTshepho Жыл бұрын

0 - 1948: Philosophy 101.

@Er.Sunil.Pedgaonkar Жыл бұрын

Good

@MakisHMMY 8 жыл бұрын

167k views. Let's assume a student watches 1-2 times this videos, and the median view count is 1.3~1.7 . We then have 100~130 thousand aspiring telecommunications engineers. Let's say there is a tough estimation of 100~5000 big telecom companies out there. Each one must take in around 20~10,000 telecom employees , just from the statistical pool that watched this video, in order for everyone to succeed... Talk about competition, huh?

@dipankersingh7186 8 жыл бұрын

+Michail Chatzinikolaou and 70-80 k students watched this !

@KabooM1067 8 жыл бұрын

You're not accounting for the people viewing out of sheer curiosity and interest for the subject, not to pursue it as a career.

@KabooM1067 8 жыл бұрын

You're not accounting for the people viewing out of sheer curiosity and interest for the subject, not to pursue it as a career.

@eugeniorivera4818 8 жыл бұрын

more importantly, look at how much it drops off by later lectures

@belowasmelashgebremariam 2 жыл бұрын

Hasabka bitegbar chigr nayediseb techebatiy kitigebro enteleka ,niseb wediseb ..kemuew malet bitikikil zetechebetu nab chubut kitewelo enteleka

@aravindan07ec04 7 жыл бұрын

What's his name?

@mitocw 7 жыл бұрын

+Aravind Narayanan This is Prof. Robert Gallager.

@belowasmelashgebremariam 2 жыл бұрын

Be theory wedikey ayfeltin

@mohammadkhawaja1476 3 жыл бұрын

23:07 She has COVID kick her out!

@belowasmelashgebremariam 2 жыл бұрын

Kemey Asmwlash Eye

@boczarionut1981 13 жыл бұрын

Who can dislike this???

@belowasmelashgebremariam 2 жыл бұрын

Thanks but ?

@waldmeister000 11 жыл бұрын

woooooow , I wish to be a PHD student in that professor's class one day .

@belowasmelashgebremariam 2 жыл бұрын

Haha nice talking

@dsgregg 13 жыл бұрын

I'm not impressed. There are a lot of great ideas about digital communications but this guy ain't got em.

@nataliaah5114 14 жыл бұрын

@christopherjaldrich thank you ^^.

@belowasmelashgebremariam 2 жыл бұрын

Hasabka bitegbar chigr nayediseb techebatiy kitigebro enteleka ,niseb wediseb ..kemuew malet bitikikil zetechebetu nab chubut kitewelo enteleka