A user's interaction with a product is monitored using one or more sensors on an RFID tag to gather information associated with the user's interaction with the product. Based on the user's interaction and gathered information, an adjustment is made to the product that is personalized to the user.

A method includes obtaining data representing multiple characters, determining a code for each character wherein each code corresponds to a different audio frequency, and transmitting the codes at the corresponding audio frequencies.

Methods, computer program products and systems for providing video tracking. The method includes receiving a first signal from a radio frequency identification (RFID) tag. A location of the RFID tag is determined in response to the first signal. An image that includes the location of the RFID tag is recorded. The location of the RFID tag is marked on the image, resulting in a marked image.

Systems and methods to determine motion parameters of physical objects using radio frequency identification (RFID) tags attached to the objects. In one embodiment, a method implemented in a radio frequency identification (RFID) system includes determining a motion parameter of the RFID tag based on detecting a Doppler frequency shift in a radio frequency signal received from the RFID tag.

A user's interaction with a product is monitored using one or more sensors on an RFID tag to gather information associated with the user's interaction with the product. Based on the user's interaction and gathered information, an adjustment is made to the product that is personalized to the user.

A data communication network includes two logically distinct class-based networks conjoined by at least one common node that has membership in each of the respective classes of the two logically distinct class-based networks. Optionally, three or more class-based networks may be conjoined to form a data communications network.

A method and system for dividing tagged items into subsets. A region is split into subregions. For each subregion, a central tagged item having more adjacent tagged items in each subregion than any other tagged item in each subregion is determined, utilizing information that includes, for each tagged item in the region, a spatial location of each tagged item and a list of all other tagged items which are adjacent to each tagged item by being within a specified constant distance (Rlimit) from each tagged item. A virtual boundary is outlined around the central tagged item to enclose the central tagged item and a portion of the tagged items in each subregion which are adjacent to the central tagged item. The portion of the tagged items in each subregion consists of all, or less than all, tagged items which are adjacent to the central tagged item in each subregion.

A mobile device includes a smartcard controller that does not rely on power received from an interrogating RF field. The mobile device also includes a small inductive device capable of inductive coupling with an RFID reader. The smartcard controller includes circuitry to modulate an impedance of a port coupled to the inductive element when in the presence of an interrogating RF field at substantially 13.56 MHz.

A data communication network includes two logically distinct class-based networks conjoined by at least one common node that has membership in each of the respective classes of the two logically distinct class-based networks. Optionally, three or more class-based networks may be conjoined to form a data communications network.

An R.F. energy collection circuit, provides a low-loss R.F. front end tuned to minimize lost power in R.F. bands commonly used for communications for passing substantially coherent R.F. signals received therefrom, a rectifier circuit coupled to receive coherent R.F. energy from the front end, and an energy storage circuit coupled to receive energy from the rectifier circuit.