Contactless Smart Cards, RFID, Payment, Transit and Security

Contactless 101: Coding data for transmission via radio waves

Thursday, September 2, 2004

So just how does the modulating of radio waves enable data transmission? The answer is found in the concept of coding. Coding refers to a modulation pattern that is understood and shared by both a transponder and a receiver. Like Morse code–the series of dots and dashes used to transmit data in the past– radio frequency coding relies on two states to indicate binary data. The states can be thought of as modulated and un-modulated, though different coding schemes encode data into the modulating states in different manners.

There are 506 words in the rest of this article …

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