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Comment Re:"Inadvertently" overcharged (Score 1) 24

Good thought :). Like occasional overcharges, there are are undercharges as well, but obviously that's not news.

In fact for those unfamiliar, it might surprise that the common model is to "undercharge" systematically based on something called second-price auction. This includes ad systems like Google AdWords and Yahoo Gemini. In a nutshell, the highest bidder wins, but pays only the bid of the runner-up. See https://en.wikipedia.org/wiki/... for some additional details. Needless to say, there are other complexities including reserve price calculations, so there are accidental screw-ups. Advertiser discounts like those mentioned in the article are quite common.

Comment Re:What the FEC? (Score 1) 357

No, network coding is strictly better than multipath routing, which is simply simultaneous transmission along multiple routes. Multipath routing still looks at information networks as commodity flow networks. Please see the butterfly network example in the network coding article again in Wikipedia to understand why information flow networks are different and allow for higher capacities and pure routing cannot achieve this. Hope you will appreciate the counter-intuition.

The paper is not a breakthrough in terms of the concept itself, which has been around for quite a while. And the concept is truly remarkable -- as much as if 2 + 1 = 4 (which is essentially the case in the butterfly network). But practical coding schemes (in terms of computational complexity) and implementations are still works in progress.

Comment Network coding. (Score 5, Informative) 357

This is not simple data compression or error control coding. This is network coding, e.g., see http://en.wikipedia.org/wiki/Linear_network_coding [wikipedia.org] and how it can increase the capacity in the butterfly network over traditional packet routing schemes, counter to our intuition for flow networks/water pipes.

It is a fairly hot research topic that has been around for last few years. But it is fairly revolutionary. It is still early days in terms of practical coding schemes and implementations.

Comment Re:It's just FEC (Score 5, Informative) 357

This is not plain FEC for point-to-point communication. This is based on network coding, e.g., see http://en.wikipedia.org/wiki/Linear_network_coding and how it can increase the capacity in the butterfly network over traditional packet routing schemes, counter to our intuition for flow networks/water pipes.

Network coding has been a fairly hot research topic in information theory and coding theory over last few years. But it is fairly revolutionary in my opinion. It is still early days in terms of practical coding schemes and implementations.

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