A tag measurement environment evaluation device includes a processor and a memory storing a program. The program is configured to, when executed by the processor, cause the processor to determine a moving tag evaluation value of each of a plurality of wireless tags based on a radio wave transmitted from each of the wireless tags and received by a tag reader configured to communicate with each of the wireless tags, and determine whether a measurement environment is suitable for a moving tag detection based on the moving tag evaluation values.

Response parameters for a population of RFID tags present in an inventory space are determined by (a) continuously scanning the inventory space to interrogate the population of RFID tags and receiving responses from RFID tags within the population; (b) after multiple responses have been received from a specific RFID tag, determining response times for the specific RFID tag corresponding to time periods between sequential ones of the multiple responses from the specific RFID tag, (c) calculating a maximum acceptable response time based at least in part on the response times determined in step (b); and (c) recording a response interval data set including one or more of the response times determined in step (b) and the maximum acceptable response time calculated in step (c).

A product tagging system is provided that includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The system includes a plurality of passive RF backscatter tags, each associated with a respective product and configured to backscatter a reply in response to a transmission from the transmitter. The system includes at least one RF backscatter receiver configured to read data for the respective product by detecting a distributed ambient backscatter signal generated by backscattering the RF signal by a corresponding one of the tags. The at least one RF backscatter receiver includes at least two antennas for performing Simultaneous Multi-Port reception (SMP) by receiving respective distributed ambient backscatter signals from a same one of the tags responsive to a same one of the RF signal being transmitted thereto. Each of the transmitter and receiver include a respective synchronized clock for the SMP.

A reader includes an antenna, a processor, and a memory storage. The antenna communicates with a wireless tag. The processor measures a time when a radio wave is received on a predetermined channel during a carrier sensing time, the carrier sensing time being a time when the wireless tag is not communicating. The memory storage stores a channel report indicating the time.

A system includes a plurality of readers and an information processor. The reader includes a first communicator, an antenna, and a first processor. An antenna communicates with radio tags. The first processor measures a time in which radio waves are received with a plurality of channels in a carrier sense time, the carrier sense time being a time in which the radio tags are not communicating and transmits a channel report indicating a time in which radio waves are received with each channel to the information processor through the first communicator. The information processor includes a second communicator and a second processor. The second processor acquires the channel report through the second communicator and generates an aggregate report indicating channel states while the plurality of readers are not communicating with the radio tags based on the plurality of acquired channel reports.

Systems and methods for implementing a radio frequency identifier (RFID) system are provided. The methods include transmitting a radio frequency (RF) signal, by an RFID interrogator with multiple antennas. The methods include receiving a superimposed received signal. The superimposed received signal includes replies from a first RFID tag and a second RFID tag that are overlapping in time. The methods also include separating the replies from the first RFID tag and second RFID tag though spatial processing of the superimposed received signal.

A proximity smart card including a card body, a first integrated circuit, a second integrated circuit, and a display element is provided. The first integrated circuit is disposed on the card body. The first integrated circuit is configured to receive a request command from the card reader, and output a first response command to the card reader. The second integrated circuit is disposed on the card body. The second integrated circuit is configured to receive the request command from the card reader, and delay an output of a second response command to the card reader. The display element is disposed on the card body. The second integrated circuit transmits to-be-displayed information to the display element. The display element displays an image according to the to-be-displayed information. In addition, a method for operating a proximity smart card is also provided.

Response parameters for a population of RFID tags present in an inventory space are determined by (a) continuously scanning the inventory space to interrogate the population of RFID tags in the inventory space and receiving responses from multiple RFID tags within the population, (b) after multiple responses have been received from a specific RFID tag within the population, determining response times for the specific RFID tag corresponding to time periods between sequential ones of the multiple responses from the specific RFID tag, (c) calculating a maximum acceptable response time based at least in part on the response times determined in step (b), and (d) recording a response interval data set including one or more of the response times determined in step (b) and the maximum acceptable response time calculated in step (c).

A product tagging system is provided. The product tagging system includes at least one RF backscatter transmitter configured to emit a Radio Frequency (RF) signal on a frequency. The product tagging system further includes a plurality of passive RF backscatter tags, each associated with a respective product and configured to reflect and frequency shift the RF signal to a respective different frequency. The product tagging system also includes at least one RF backscatter receiver configured to read the respective product on the respective different frequency by detecting a distributed ambient backscatter signal generated by a reflection and frequency shifting of the RF signal by a corresponding one of the plurality of passive RF backscatter tags.

Systems and methods for self-checkout using an RFID tag. The methods include: detecting motion of the RFID tag using a motion sensor local to the RFID tag; enabling at least one communication operation of the RFID tag in response to the detection of the RFID tag's motion; performing operations by the RFID tag to communicate first information to an enterprise system; using the first information by the enterprise system to associate the RFID tag with an individual of a plurality of individuals present in a given facility; and dynamically changing displayed content of a display device to include information about an object to which the RFID tag is coupled, the display device being in proximity to the individual, in the possession of the individual or being worn by the individual.