Remote communication device and system for communication
First Claim
1. A remote communication device comprising:
- an antenna operable to receive and backscatter a carrier signal, wherein the backscattered carrier signal further comprises a secondary signal having frequencies within an identification bandwidth that is selected from a plurality of distinct identification bandwidths based on information in the received carrier signal; and
a signal processing circuit coupled to the antenna, the signal processing circuit comprising at least one encoding circuit operable to encode binary data into the backscattered carrier signal by periodically modulating the frequency of the secondary signal from one encoding frequency to another one of 2n+1 encoding frequencies within the identification bandwidth, whereinn is an integer greater than or equal to 1, and whereinbinary data is encoded into the backscattered carrier signal without any delay resultant from simultaneous backscattered signals of other remote communication devices.
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Accused Products
Abstract
Remote communication devices (i.e., radio frequency identification (RFID) tag) and systems for communicating between one or more RFID tags and a reader using a frequency modulation method to encode binary data are disclosed herein. For example, a remote communication device includes an antenna operable to receive and backscatter a carrier signal, wherein the backscattered carrier signal further comprises a secondary signal within an identification bandwidth. The remote communication device also includes a signal processing circuit coupled to the antenna, the signal processing circuit comprising at least one encoding circuit operable to encode binary data into the backscattered carrier signal by periodically modulating the frequency of the secondary signal from one encoding frequency to another one of 2n+1 encoding frequencies within the identification bandwidth, wherein n is an integer greater than or equal to 1.
25 Citations
39 Claims
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1. A remote communication device comprising:
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an antenna operable to receive and backscatter a carrier signal, wherein the backscattered carrier signal further comprises a secondary signal having frequencies within an identification bandwidth that is selected from a plurality of distinct identification bandwidths based on information in the received carrier signal; and a signal processing circuit coupled to the antenna, the signal processing circuit comprising at least one encoding circuit operable to encode binary data into the backscattered carrier signal by periodically modulating the frequency of the secondary signal from one encoding frequency to another one of 2n+1 encoding frequencies within the identification bandwidth, wherein n is an integer greater than or equal to 1, and wherein binary data is encoded into the backscattered carrier signal without any delay resultant from simultaneous backscattered signals of other remote communication devices. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A reader comprising:
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an antenna operable to receive a plurality of backscattered signals from a plurality of remote communication devices, wherein each backscattered signal comprises a carrier signal and a secondary signal, wherein the secondary signal comprises a series of up to 2n+1 encoding frequencies within an identification bandwidth of a plurality of distinct identification bandwidths; and a receiving circuit coupled to the antenna operable to extract data from each of the backscattered signals from two or more remote communications devices simultaneously by converting a change from one encoding frequency to another encoding frequency in the secondary signal of each backscattered signal into n bits of binary data, wherein n is an integer greater than or equal to 1, and wherein the receiving circuit is operable to extract data simultaneously from each of the backscattered signals, the secondary signal of each backscattered signal comprising encoding frequencies within an identification bandwidth that is different for each of the remote communications devices. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A communication system comprising:
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a plurality of remote communication devices, wherein each remote communication device comprises; a remote communication device antenna operable to receive and backscatter a carrier signal, wherein the backscattered carrier signal further comprises a secondary signal having frequencies within an identification bandwidth that is selected from a plurality of distinct identification bandwidths; and a signal processing circuit coupled to the remote communication device antenna, the signal processing circuit comprising at least one encoding circuit operable to encode binary data into the backscattered carrier signal by periodically modulating the frequency of the secondary signal from one to another one of 2n+1 encoding frequencies within the selected identification bandwidth, and a reader comprising; a reader antenna operable to receive the plurality of backscattered carrier signals from the plurality of remote communication devices, and a receiving circuit coupled to the reader antenna operable to extract data from each of the backscattered carrier signals from two or more remote communications devices at least partially simultaneously by converting change from one encoding frequency to another encoding frequency in the secondary signal of each backscattered carrier signal into n bits of binary data, wherein n is an integer greater than or equal to 1, and wherein the receiving circuit of the reader is operable to extract data simultaneously from each of the backscattered signals, the secondary signal of each backscattered signal comprising encoding frequencies within an identification bandwidth that is different for each of the remote communications devices. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for communication between a remote communication device and a reader comprising:
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transmitting a carrier signal from the reader; receiving the carrier signal at two or more remote communication devices; selecting, at each remote communication device, a set of encoding frequencies, from a plurality of sets of encoding frequencies, that are to be used to encode data; backscattering the carrier signal at each remote communication device, wherein the backscattered carrier signal further comprises a secondary signal within an identification bandwidth that is selected from a plurality of distinct identification bandwidths; encoding binary data into the backscattered signal at each remote communication device by periodically modulating the secondary signal from one to another of the selected encoding frequencies within the identification bandwidth; simultaneously receiving the backscattered carrier signals from at least two remote communication devices at a reader; and extracting data from each backscattered carrier signal. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A method for receiving data from a plurality of remote communication devices at a reader comprising:
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transmitting a carrier signal to at least a first remote communications device and a second remote communications device; receiving backscattered signals from each remote communication device, each backscattered signal comprising a secondary signal having frequencies within an identification bandwidth that is selected from a plurality of distinct identification bandwidths, the secondary signal comprising a set of encoding frequencies; and extracting data from each received signal, wherein data is extracted simultaneously from each of the backscattered signals, the secondary signal of each backscattered signal comprising encoding frequencies within an identification bandwidth that is different for each of the remote communications devices. - View Dependent Claims (35, 36, 37, 38, 39)
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Specification