

Printing process uses carbon nanotubes










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RE: How's that gonna work?
By AssBall on 3/19/2010 1:24:35 PM , Rating: 0
An IBM poweredge could easily parse 16 bits of data from 2 hundred thousand products say overnight, and organise it in a database. Hell you could probably do it in real time with a decent server.

RE: How's that gonna work?
By Solandri on 3/19/2010 1:56:04 PM , Rating: 3
There's no question a computer can process the data from a couple hundred products. That's the easy part. My point is, RFID tags automatically transmit when they're hit with an RF transmission within a certain frequency band. So they're not going to do collision detection like networking hardware does. If you do this to the store, a bunch of RFID tags are going to broadcast their response at the same time.

Say you have a dozen cans of soup with these tags. You hit them with the signal to transmit, and you get a dozen cans transmitting replies at the same time and at the same frequency. How do you tell them apart? Take a simplified case where each digit in the serial number is transmitted by a code at a certain frequency, and the digits are transmitted sequentially. If one can's ID is 123 and a second can's ID is 456 and they both broadcast at the same time, there's no way to tell if what was transmitted was 123, or 156, or 423, or 126, or 453, etc.

And why the downrate for my first post? It was a genuine question. My graduate thesis was on collisions in communications channels. If there's some new theory or technology which solves this problem, I really want to know what it is.

