System for reading information transmitted from a transponder
First Claim
1. A reader device for reading information transmitted from a transponder via a backscatter signal generated by the transponder in response to a stimulus signal generated by the reader device, the reader device comprising:
- a first power estimation unit configured to estimate a first power value indicative of power of the stimulus signal at a position of the transponder by evaluating power information included in the backscatter signal;
a second power estimation unit configured to estimate a second power value indicative of power of the backscatter signal at a position of the reader device;
a distance estimation unit configured to estimate a distance between the reader device and the transponder based on the first power value and the second power value, wherein the first power estimation unit is configured to estimate the first power value by evaluating the backscatter signal based on a predefined nonlinear transfer function of an available power versus modulation efficiency by which the stimulus signal is manipulated by the transponder or evaluating a clock rate of the backscatter signal manipulated by the transponder.
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Accused Products
Abstract
A reader device (110) for reading information transmitted from a transponder (130) via a backscatter signal (132) generated by the transponder (130) in response to a stimulus signal (112) generated by the reader device (110), the reader device (110) comprising a first power estimation unit (114) adapted for estimating a first power value indicative of the power of the stimulus signal (112) at a position of the transponder (130) by evaluating a power information included in the backscatter signal (132), a second power estimation unit (116) adapted for estimating a second power value indicative of the power of the backscatter signal (132) at a position of the reader device (110), and a distance estimation unit (118) adapted for estimating a distance (d1) between the reader device (110) and the transponder (130) based on the first power value and the second power value.
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Citations
12 Claims
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1. A reader device for reading information transmitted from a transponder via a backscatter signal generated by the transponder in response to a stimulus signal generated by the reader device, the reader device comprising:
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a first power estimation unit configured to estimate a first power value indicative of power of the stimulus signal at a position of the transponder by evaluating power information included in the backscatter signal; a second power estimation unit configured to estimate a second power value indicative of power of the backscatter signal at a position of the reader device; a distance estimation unit configured to estimate a distance between the reader device and the transponder based on the first power value and the second power value, wherein the first power estimation unit is configured to estimate the first power value by evaluating the backscatter signal based on a predefined nonlinear transfer function of an available power versus modulation efficiency by which the stimulus signal is manipulated by the transponder or evaluating a clock rate of the backscatter signal manipulated by the transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transponder for transmitting information to a reader device via a backscatter signal generated by the transponder in response to a stimulus signal generated by the reader device, the transponder comprising:
a backscatter signal generation unit configured to generate the backscatter signal based on the stimulus signal including power information indicative of power of the stimulus signal at a position of the transponder, wherein the backscatter signal generation unit is configured to generate the backscatter signal either by manipulating the stimulus signal in accordance with a nonlinear transfer function of an available power versus modulation efficiency or by manipulating the stimulus signal with a clock rate in accordance with the power of the stimulus signal at a position of the transponder. - View Dependent Claims (10)
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11. A method of reading, by a reader device, information transmitted from a transponder via a backscatter signal generated by the transponder in response to a stimulus signal generated by the reader device, the method comprising:
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estimating a first power value indicative of power of the stimulus signal at a position of the transponder by evaluating power information included in the backscatter signal by evaluating the backscatter signal based on a predefined nonlinear transfer function of an available power versus modulation efficiency by which the stimulus signal is manipulated by the transponder, or by evaluating a clock rate of the backscatter signal manipulated by the transponder; estimating a second power value indicative of the power of the backscatter signal at a position of the reader device; and estimating a distance between the reader device and the transponder based on the first power value and the second power value. - View Dependent Claims (12)
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Specification