Wireless communications systems, radio frequency identification devices, wireless communications methods, and radio frequency identification device communications methods
First Claim
1. A wireless communications system comprising:
- a reader configured to output a plurality of first wireless signals including different modulation frequencies and to receive a plurality of second wireless signals;
a plurality of communication devices configured to receive the first wireless signals and to output the second wireless signals using backscatter modulation; and
wherein the communication devices are individually configured to respond to one of the first wireless signals having a first modulation frequency at a first moment in time and to respond to one of the first wireless signals having a second modulation frequency different than the first modulation frequency at a second moment in time.
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Accused Products
Abstract
Wireless communications systems, radio frequency identification devices, wireless communications methods, and radio frequency identification device communications methods are described. In one aspect, a wireless communications system includes a reader configured to output a plurality of wireless signals including different modulation frequencies and to receive a plurality of second wireless signals, a plurality of communication devices configured to receive the first wireless signals and to output the second wireless signals using backscatter modulation and wherein the communication devices are individually configured to respond to one of the first wireless signals having a first modulation frequency at a first moment in time and to respond to one of the first wireless signals having a second modulation frequency different than the first modulation frequency at a second moment in time.
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Citations
40 Claims
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1. A wireless communications system comprising:
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a reader configured to output a plurality of first wireless signals including different modulation frequencies and to receive a plurality of second wireless signals; a plurality of communication devices configured to receive the first wireless signals and to output the second wireless signals using backscatter modulation; and wherein the communication devices are individually configured to respond to one of the first wireless signals having a first modulation frequency at a first moment in time and to respond to one of the first wireless signals having a second modulation frequency different than the first modulation frequency at a second moment in time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 34, 35, 36, 37, 38)
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11. A radio frequency identification device comprising:
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an antenna configured to communicate wireless signals; radio frequency identification device communication circuitry coupled with the antenna and configured to process a plurality of different first wireless signals received from a reader and to control the outputting of a plurality of second wireless signals to implement radio frequency identifications device communications with the reader; and wherein the radio frequency identification device communication circuitry is configured to generate a reference signal having a first frequency to control reception of a first type of the first wireless signals and to generate the reference signal having a second frequency different than the first frequency to control reception of a second type of the first wireless signals. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A wireless communications method comprising:
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providing a reader and a plurality of communication devices; communicating a plurality of different first wireless signals using the reader; first configuring a plurality of communication devices to respond to a first type of the first wireless signals; second configuring at least one of the communication devices to respond to a second type of the first wireless signals; and backscatter modulating radio frequency energy using the communication devices to communicate a plurality of second wireless signals to respond to the first type of the first wireless signals and the second type of the first wireless signals. - View Dependent Claims (18, 19, 20, 21, 22, 39)
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23. A radio frequency identification device communications method comprising:
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providing a radio frequency identification device comprising communication circuitry; receiving a plurality of wireless communications signals within the radio frequency identification device; providing a clock signal including a frequency using the radio frequency identification device; and processing the received wireless communications signals using the communication circuitry, the processed wireless communications signals having a modulation frequency corresponding to the frequency of the clock signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 40)
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33. A radio frequency identification device communications method comprising:
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providing a reader and a radio frequency identification device; communicating a plurality of forward link wireless signals using the reader including first wireless signals having a first modulation frequency and second wireless signals having a second modulation frequency; receiving the forward link wireless signals using the radio frequency identification device; generating a clock signal using the radio frequency identification device and the clock signal having a frequency substantially equal to the first modulation frequency; processing a predefined one of the first wireless signals using the radio frequency identification device; changing the frequency of the clock signal to a frequency substantially equal to the second modulation frequency using the radio frequency identification device responsive to the processing; disregarding others of the received first wireless signals using the radio frequency identification device after the changing; processing the received second wireless signals after the changing; and outputting a plurality of backscatter modulation signals comprising return link wireless signals using the radio frequency identification device for communication to the reader to implement radio frequency identification device communications.
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Specification