RFID TAGS WITH CDMA COMMUNICATION CAPABILITIES
First Claim
Patent Images
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 and modulation circuitry received by the substrate and coupled among the antenna and the memory, wherein the processing and modulation circuitry is configured to receive the stored data and 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 and is further configured to provide the first CDMA encoded signal to the first antenna and the second CDMA encoded signal to the second antenna; and
wherein the first antenna transmits the first CDMA encoded signal and the second antenna transmits the second CDMA encoded signal, and wherein the first CDMA encoded signal is independent from the second CDMA encoded signal.
1 Assignment
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Accused Products
Abstract
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.
49 Citations
23 Claims
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1. An RFID tag, comprising:
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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 and modulation circuitry received by the substrate and coupled among the antenna and the memory, wherein the processing and modulation circuitry is configured to receive the stored data and 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 and is further configured to provide the first CDMA encoded signal to the first antenna and the second CDMA encoded signal to the second antenna; and wherein the first antenna transmits the first CDMA encoded signal and the second antenna transmits the second CDMA encoded signal, and wherein the first CDMA encoded signal is independent from the second CDMA encoded signal. - View Dependent Claims (3, 4)
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2. (canceled)
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5. An RFID reader, comprising:
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antenna means for wirelessly exchanging signals, wherein the antenna means includes at least a first antenna and a second antenna; a memory means for storing data; and processing and circuitry means, coupled among the antenna means and the memory means, for receiving a first portion of RFID tag data stored in RFID tags from the first antenna and for receiving a second portion of the RFID tag data from the second antenna, wherein the first portion is different from the second portion, and wherein the received RFID tag data is encoded using code division multiple access (CDMA) encoding, and wherein the processing and circuitry means further comprises means for decoding the CDMA encoded RFID tag data. - View Dependent Claims (6, 7)
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8. A semiconductor device for use in an RFID tag, the device comprising:
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encoder circuitry that receives incoming data stored by the RFID tag and converts the stored RFID data into at least two independent spread spectrum signals using a pseudo-random code; and an output portion for outputting the RFID tag data, as the at least two spread spectrum signals spread using the pseudo-random code, to be transmitted in parallel by the RFID tag through at least two transmitting antennas. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An apparatus for use in an RFID data collection system, the apparatus comprising:
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an antenna portion for wirelessly exchanging signals wherein the antenna portion includes at least a first antenna and a second antenna; a memory portion for storing RFID data; and a signal processing portion coupled among the antenna portion and the memory portion, wherein the signal processing portion is configured to receive RFID data and to at least encode or decode the received RFID data via at least two independent orthogonal codes that are mutually orthogonal to other codes employed by the RFID data collection system, and is further configured to communicate the RFID data encoded or decoded via a first of the at least two independent orthogonal codes via the first antenna and to communicate the RFID data encoded or decoded via a second of the at least two independent orthogonal codes via the second antenna. - View Dependent Claims (15, 16)
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17. A computer-readable medium whose contents cause at least one device to perform a method for decoding data received from an RFID tag, the method comprising:
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receiving RFID tag data from the RFID tag, wherein the received RFID tag data is encoded into at least two code division multiplexing (CDM) encoded sequences, and receiving the RFID tag data comprises; receiving the RFID tag data encoded into a first of the at least two CDM encoded sequences via a first antenna; and receiving the RFID tag data encoded into a second of the at least two CDM encoded sequences via a second antenna; decoding the CDM encoded RFID tag data; and
,outputting the decoded CDM encoded RFID tag data for data storage or automated data processing. - View Dependent Claims (18)
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19. A wireless data collection system comprising:
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an RFID tag having at least a first antenna and a second antenna; an RFID reader module having at least one antenna and configured to exchange wireless signals with the RFID tag; wherein at least the RFID tag or the RFID reader is configured to transmit the RFID data over a range of frequencies, wherein the RFID data is apportioned into two channels and spread over the range of frequencies via at least a first spreading code and a second spreading code, and wherein the RFID tag and RFID reader are configured to communicate the RFID data apportioned to the first spreading code via the first antenna, and to communicate the RFID data apportioned to the second spreading code via the second antenna. - View Dependent Claims (20, 21, 22, 23)
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Specification