Reflective communication using radio-frequency devices
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Abstract
The present invention relates to a reflective communication system that allows information from wireless communication devices, such as radio-frequency identification devices (RFID), to be reflectively communicated to a receiver in lieu of using a separate communication system. A transmitter transmits a communication signal, having a carrier frequency, to the wireless communication device to provide power. The wireless communication device modulates a data signal onto the communication signal to form a reflected data signal. The wireless communication device reflects the reflected data signal directly to the receiver. In this manner, the process of communicating information from a wireless communication device is accomplished in one communication system rather than two. If the receiver also directly receives the communication signal from the transmitter, the receiver can determine the location of the wireless communication device relative to the transmitters.
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Citations
84 Claims
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1-53. -53. (canceled)
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54. A reflective communication system comprising:
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a Bluetooth transmitter operable to transmit a communication signal having a first modulation;
a wireless communication device configured to receive the communication signal from the Bluetooth transmitter and reflectively modulate the communication signal with a data signal having a second modulation to form a reflected data signal; and
a receiver configured to receive the reflected data signal and the communication signal, wherein the receiver is adapted to form the data signal using the communication signal. - View Dependent Claims (55, 56, 57, 58, 59)
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60. A receiver for receiving a reflected data signal, the receiver comprising:
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a transistor biased to provide a negative resistance at a gate terminal of the transistor, the transistor having at least one feedback component coupled between the gate terminal and a second terminal of the transistor;
an antenna coupled with the gate terminal and operable to receive a communication signal, wherein the communication signal causes the transistor to operate in a non-linear region, and wherein in response to receiving the communication signal, the transistor mixes the communication signal with a reflected data signal; and
a tuned circuit coupled to a third terminal of the transistor tuned to a modulation frequency of the reflected data signal and operable to demodulate the reflected data signal to obtain a data signal used to modulate the communication signal. - View Dependent Claims (61, 62, 63, 64, 65)
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66. A reflective communication device comprising:
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a Bluetooth transmitter configured to transmit a communication signal having a first modulation;
a receiver combined with the Bluetooth transmitter, the receiver configured to receive a reflected data signal modulated with a data signal having a second modulation;
a first antenna operatively coupled with the Bluetooth transmitter to transmit the communication signal;
a second antenna operatively coupled with the receiver to receive the reflected data signal; and
a mixer combined with the Bluetooth transmitter and the receiver, the mixer configured to mix the communication signal and the reflected data signal to remove the first modulation from the reflected data signal to form the data signal. - View Dependent Claims (67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79)
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80. A method of receiving a reflected data signal, the method comprising:
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receiving a communication signal having a first modulation from a Bluetooth transmitter;
receiving a reflected data signal formed from reflectively modulating the communication signal with a data signal having a second modulation; and
removing said communication signal from said reflected data signal to form said data signal. - View Dependent Claims (81, 82, 83, 84)
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Specification