Dual mode modulated backscatter system
First Claim
1. A radio communication system comprisingan interrogator includingmeans for generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating to which of multiple response modes a receiving tag should respond,means for transmitting said first modulated signal to said at least one tag,said at least one tag includingmeans for receiving said first modulated signal,means for decoding said first modulated signal to obtain said first information signal,backscatter modulator means for modulating a reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal,said interrogator further includingmeans for receiving said second modulated signal, andmeans for demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.
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Abstract
A radio communication system includes an Interrogator for generating and transmitting a first modulated signal by modulating a first information signal onto a radio carrier signal, the first information signal indicating in which of multiple response modes a receiving Tag should respond. One or more Tags of the system receive the first modulated signal and decode it to obtain the first information signal. A Backscatter Modulator modulates the reflection of the first modulated signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a second modulated signal. The Interrogator receives and demodulates the second modulated signal to obtain the indicated second information signal.
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Citations
26 Claims
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1. A radio communication system comprising
an interrogator including means for generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating to which of multiple response modes a receiving tag should respond, means for transmitting said first modulated signal to said at least one tag, said at least one tag including means for receiving said first modulated signal, means for decoding said first modulated signal to obtain said first information signal, backscatter modulator means for modulating a reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal, said interrogator further including means for receiving said second modulated signal, and means for demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.
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11. A tag for use in a radio communication system comprising
means for receiving said first modulated signal, means for decoding said first modulated signal to obtain said first information signal, said first information signal indicating in which of multiple response modes a receiving tag should respond, backscatter modulator means for modulating the reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a reflected second modulated signal.
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12. A radio communication system comprising
an interrogator including means for generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating which of multiple response modes a receiving tag should respond, means for transmitting to said at least one tag during a first time interval said first modulated signal, and transmitting said radio carrier signal during a second time interval, said at least one tag including means for receiving said radio carrier signal and said first modulated signal, means for decoding said first modulated signal to obtain said first information signal, backscatter modulator means for modulating the reflection, during said second time interval, of said radio carrier signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal, said interrogator further including means for receiving said second modulated signal, and means for demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.
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22. A method of operating a radio communication system comprising the steps of
at an interrogator generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating which of multiple response modes a receiving tag should respond, transmitting said first modulated signal to said at least one tag; -
at said at least one tag receiving said first modulated signal, decoding said first modulated signal to obtain said first information signal, modulating, using a backscatter modulator, a reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal; at said interrogator receiving said second modulated signal, and demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.
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23. A method of operating a tag for use in a radio communication system comprising the steps of
receiving a first modulated signal, decoding said first modulated signal to obtain said first information signal, said first information signal indicating in which of multiple response modes a receiving tag should respond, modulating, using a backscatter modulator, a reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a reflected second modulated signal.
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24. A method of operating a radio communication system comprising the steps of
at an interrogator generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating which of multiple response modes a receiving tag should respond, transmitting to said at least one tag during a first time interval said first modulated signal, and transmitting said radio carrier signal during a second time interval; -
at said at least one tag receiving said radio carrier signal and said first modulated signal, decoding said first modulated signal to obtain said first information signal, modulating, using a backscatter modulator, a reflection, during said second time interval, of said radio carrier signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal; at said interrogator receiving said second modulated signal, and demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.
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25. A tag for use in a radio communication system comprising
means for receiving a radio carrier signal and a first modulated signal, means for decoding said first modulated signal to obtain said first information signal, said first information signal indicating in which of multiple response modes a receiving tag should respond, backscatter modulator means for modulating the reflection of said radio carrier signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a reflected second modulated signal.
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26. A method of operating a tag for use in a radio communication system comprising the steps of
receiving a radio carrier signal and a first modulated signal, decoding said first modulated signal to obtain said first information signal, said first information signal indicating in which of multiple response modes a receiving tag should respond, modulating, using a backscatter modulator, a reflection of said radio carrier signal using a second information signal whose content, data rate, or modulation is determined by said first information signal, thereby forming a reflected second modulated signal.
Specification