Wireless power and data transmission

An apparatus comprising:

• a first circuit configured and arranged to communicate a first radio frequency signal between a base station and a transponder to power the transponder, the first radio frequency signal including noise and data for authenticating communications between the base station and the transponder;
• a second circuit configured and arranged to communicate a second radio frequency signal between the base station and the transponder, the second radio frequency signal including data for authenticating communications between the base station and the transponder;
• and
• a signal differentiation circuit configured and arranged to mitigate detection of the noise presented via the first radio frequency signal while detecting data in the second radio frequency signal via signal differentiation.

A system comprising:

• a base station configured and arranged to communicate a first radio frequency signal including power, noise and data for authenticating communications;
• a transponder configured and arranged to receive the first radio frequency signal from the base station, and to use power in the first radio frequency signal to generate and transmit a second radio frequency signal including data for authenticating communications;
• and
• wherein the base station and the transponder are configured and arranged to mitigate detection of the noise presented via the first radio frequency signal via signal differentiation, while communicating data in the second radio frequency signal to the base station, thereby authenticating the transponder.

An apparatus comprising:

• a first circuit configured and arranged to communicate a first radio frequency signal between a base station and a transponder to power the transponder, the first radio frequency signal including noise and data for authenticating communications with the transponder;
• and
• a second circuit configured and arranged to communicate a second radio frequency signal including data for authenticating communications between the base station and the transponder, the second radio frequency signal having a frequency that is different than the first radio frequency signal;
• and
• a signal differentiation circuit configured and arranged to mitigate detection of the noise presented via the first radio frequency signal while detecting data in the second radio frequency signal, based upon the respective frequencies of the first and second radio frequency signals.

An apparatus comprising:

• a communication circuit configured and arranged to
• communicate a first radio frequency signal between a base station and a transponder to power the transponder, the first radio frequency signal including noise and data for authenticating communications with the transponder, and
• communicate a second radio frequency signal including data for authenticating communications between the base station and the transponder;
• and
• a signal differentiation circuit configured and arranged to mitigate detection of the noise presented via the first radio frequency signal while detecting data in the second radio frequency signal, by subtracting a representation of the first radio frequency signal from the second radio frequency signal to produce a difference signal, and detecting the data in the second radio frequency signal in the difference signal.