RFID tags with CDMA communication capabilities

摘要

An apparatus for use in an RFID data collection system includes an antenna portion for wirelessly exchanging signals and a memory portion for storing RFID data. A signal processing portion is coupled among the antenna portion and the memory portion. The signal processing portion is configured to receive RFID data and to at least encode or decode the received RFID data via at least one spreading code, such as a mutually orthogonal code. Other configurations are also disclosed.

主权项

1. An RFID tag, comprising:
a tag substrate; at least a first antenna and a second antenna formed on the substrate; a memory, received by the substrate, and storing data and at least one orthogonal code selected from a set of mutually orthogonal codes; processing circuitry and modulation circuitries received by the substrate and coupled among the antenna and the memory, the processing circuitry and modulation circuitries configured to:
receive at least some of the stored data, generate an initial protocol communication based on the stored data,
wherein the initial protocol communication indicates that the RFID tag is capable of CDMA communication, encode the stored data using the stored orthogonal code to produce a first code division multiple access (CDMA) encoded signal and a second CDMA encoded signal, direct at least one of the first antenna and the second antenna to transmit the non-CDMA encoded initial protocol communication to an RFID reader, and subsequently direct the first antenna to transmit the first CDMA encoded signal and direct the second antenna to transmit the second CDMA encoded signal
wherein the first CDMA encoded signal is different than the second CDMA encoded signal, and wherein the first CDMA encoded signal and the second CDMA encoded signal together comprise a single sequentially partitioned message.