Communication system, interrogators and communication methods
First Claim
1. A backscatter communication system comprising:
- an interrogator including a transmitter configured to output a forward link communication and a receiver configured to receive a return link communication having a carrier signal, the receiver being configured to reduce the amplitude of the carrier signal of the return link communication; and
a communication device configured to modulate the carrier signal to communicate the return link communication responsive to reception of the forward link communication.
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Accused Products
Abstract
The present invention includes backscatter communication systems, interrogators, methods of communicating in a backscatter system, and backscatter communication methods. According to one aspect of the present invention, a backscatter communication system includes an interrogator including a transmitter configured to output a forward link communication and a receiver configured to receive a return link communication having a carrier signal, the receiver being configured to reduce the amplitude of the carrier signal of the return link communication; and a communication device configured to modulate the carrier signal to communicate the return link communication responsive to reception of the forward link communication.
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Citations
52 Claims
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1. A backscatter communication system comprising:
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an interrogator including a transmitter configured to output a forward link communication and a receiver configured to receive a return link communication having a carrier signal, the receiver being configured to reduce the amplitude of the carrier signal of the return link communication; and
a communication device configured to modulate the carrier signal to communicate the return link communication responsive to reception of the forward link communication. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A backscatter system interrogator comprising:
a receiver configured to receive a return link communication comprising a modulated continuous wave signal comprising a radio frequency continuous wave signal having a first frequency and a modulation signal having a different frequency, the receiver being further configured to reduce the amplitude of the return link communication at the frequency of the radio frequency continuous wave signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A coherent backscatter system interrogator comprising:
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a transmitter configured to communicate a wireless forward link communication, a wireless continuous wave signal and a local continuous wave signal; and
a receiver configured to receive the local continuous wave signal from the transmitter and wireless return link communications comprising modulated continuous wave signals, the receiver being configured to reduce the amplitude of the return link communications using the local continuous wave signal received from the transmitter. - View Dependent Claims (15, 16, 17, 18)
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19. A method of communicating in a backscatter system comprising:
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transmitting a forward link communication;
transmitting a wireless continuous wave signal;
receiving the forward link communication;
modulating the wireless continuous wave signal responsive to the receiving the forward link communication, the modulating providing a modulated continuous wave signal;
receiving the modulated continuous wave signal; and
reducing the amplitude of the modulated continuous wave signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A backscatter communications method comprising:
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transmitting a forward link communication and a wireless continuous wave signal using an interrogator;
receiving the forward link communication using a remote communication device;
communicating a return link communication comprising a modulated continuous wave signal responsive to the receiving the forward link communication, the communicating including modulating the wireless continuous wave signal using the remote communication device;
receiving the modulated continuous wave signal using the interrogator; and
reducing the amplitude of the modulated continuous wave signal using the interrogator. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. A coherent backscatter communication method comprising:
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transmitting a wireless forward link communication;
transmitting a continuous wave signal;
providing the continuous wave signal as a local signal;
receiving the wireless forward link communication;
communicating a wireless return link communication including modulating the continuous wave signal following the receiving;
receiving the wireless return link communication; and
reducing the amplitude of the wireless return link communication using the local signal. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. A method of communicating within a coherent backscatter communication system, the method comprising:
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outputting a forward link communication;
outputting a wireless continuous wave signal;
providing a local continuous wave signal;
communicating a modulated continuous wave signal responsive to the outputting the forward link communication;
receiving the modulated continuous wave signal; and
reducing the amplitude of the modulated continuous wave signal including;
matching the amplitude of the local continuous wave signal with the amplitude of the received modulated continuous wave signal;
adjusting the phase of the local continuous wave signal following the matching providing an adjusted continuous wave signal; and
summing the adjusted continuous wave signal with the modulated continuous wave signal. - View Dependent Claims (46, 47, 48, 49, 50, 51)
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52. A method of reducing power within a modulated return link continuous wave signal of a coherent backscatter communication system including an interrogator and a remote communication device, the method comprising:
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transmitting a radio frequency forward link communication;
transmitting a radio frequency continuous wave signal having a first frequency;
providing a local continuous wave signal having the first frequency;
receiving the radio frequency forward link communication;
modulating the radio frequency continuous wave signal following the receiving the radio frequency forward link communication, the modulating comprising reflecting the radio frequency continuous wave signal using a modulation signal having a second frequency and providing a modulated continuous wave signal having a carrier component and plural side band components;
receiving the modulated continuous wave signal; and
reducing the amplitude of the carrier component of the modulated continuous wave signal including;
matching the amplitude of the local continuous wave signal with the amplitude of the modulated continuous wave signal;
adjusting the phase of the local continuous wave signal following the matching; and
summing the local continuous wave signal and the modulated continuous wave signal following the adjusting.
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Specification