Patent ID: 8063747

Claim:
An RFID tag, comprising: at least one antenna element; signal generation means that operates in a first mode of operation and a second mode of operation to generate a signal that represents a sequence of symbols, wherein in said first mode of operation the signal is generated in accordance with a first signaling scheme wherein the signal is derived by multiplication of a first-type bi-phase baseband waveform and a square wave, wherein the first-type bi-phase baseband waveform has a first symbol rate SR 1 , wherein the square wave has a rate M*SR 1 , where M is selected from a number of different integer values, and wherein the first-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary, and wherein in said second mode of operation the signal is generated in accordance with a second signaling scheme wherein the signal comprises a second-type bi-phase baseband waveform having a second symbol rate SR 2 different from said first symbol rate SR 1 , and wherein the second-type bi-phase baseband waveform has a phase inversion at least on every symbol boundary; and modulation means, operably coupled between the signal generation means and the at least one antenna element, for modulating a backscatter signal transmitted at the at least one antenna element in accordance with the signal generated by the signal generation means.