Geo-security method and system
First Claim
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1. A geo-security method, comprising the steps of:
- (a) transmitting a probe signal using a transmitter of a wireless device at a transmission site to be authenticated;
(b) time-reversal precoding a feedback transmission based on a channel response estimation of the probe signal;
(c) including the time-reversal precoding in a signal transmission at the transmission site to be authenticated;
(d) estimating the time-reversal precoding in the signal transmission;
(e) authenticating the transmission site based on the estimating step (d) and the probe signal channel response estimation of step (b), wherein the step of authenticating the transmission site further comprises the step of measuring time delay focusing of energy at the antenna of the wireless device to measure the temporal compression due to the authenticating process, the time delay energy focusing being characterized by;
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Abstract
The geo-security method and system uses spatio-temporal radio channel information during authentication to grant permission to access, use and/or operate the intended device. The geo-security method and system uses a wideband radio channel impulse response (or transfer function of radio channel) from antenna of RF source to antenna of a RF receiver at the device position to determine the legitimacy of the intended device'"'"'s location.
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Citations
12 Claims
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1. A geo-security method, comprising the steps of:
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(a) transmitting a probe signal using a transmitter of a wireless device at a transmission site to be authenticated; (b) time-reversal precoding a feedback transmission based on a channel response estimation of the probe signal; (c) including the time-reversal precoding in a signal transmission at the transmission site to be authenticated; (d) estimating the time-reversal precoding in the signal transmission; (e) authenticating the transmission site based on the estimating step (d) and the probe signal channel response estimation of step (b), wherein the step of authenticating the transmission site further comprises the step of measuring time delay focusing of energy at the antenna of the wireless device to measure the temporal compression due to the authenticating process, the time delay energy focusing being characterized by; - View Dependent Claims (2, 3, 4, 5, 6)
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7. A geo-security system, comprising:
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(a) means for transmitting a probe signal using a transmitter of a wireless device at a transmission site to be authenticated; (b) means for time-reversal precoding a feedback transmission based on a channel response estimation of the probe signal; (c) means for including the time-reversal precoding in a signal transmission at the transmission site to be authenticated; (d) means for estimating the time-reversal precoding in the signal transmission; (e) means for authenticating the transmission site based on the time-reversal precoding estimating means (d) and the probe signal channel response estimation; (f) wherein the means (b), the means (d), and the means (e) each comprise means for authenticating multiple said wireless devices, each said wireless device having a corresponding said means (a), a corresponding means (c), and a unique time reversal (TR) spatial-temporal authentication key; (g) means for using a reconfigurable antenna in which a particular radiation pattern is generating to increase security and enhance system performance; (h) means for identifying each radiation pattern state using a unique combination code of ON-OFF switches in control circuitry of the antenna; and (i) means for measuring temporal energy focusing with peak-to-side lobe ratio characterized by; - View Dependent Claims (8, 9, 10, 11)
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12. A geo-security method, comprising the steps of:
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(a) transmitting a probe signal using a transmitter of a wireless device at a transmission site to be authenticated; (b) time-reversal precoding a feedback transmission based on a channel response estimation of the probe signal; (c) including the time-reversal precoding in a signal transmission at the transmission site to be authenticated; (d) estimating the time-reversal precoding in the signal transmission; (e) authenticating the transmission site based on the estimating step (d) and the probe signal channel response estimation of step (b), wherein the step of authenticating the transmission site further comprises the step of measuring temporal energy focusing with peak-to-side lobe ratio characterized by;
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Specification