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US 10,321,262 B2Granted
Geo-security method and system
AssigneeQatar Foundation for Education, Science and Community Development
InventorsHassan Mohamed El-Sallabi, Mohamed Mahmoud Abdallah, Khalid Ali Qaraqe, Jean-Francois Chamberland, Gregory H. Huff
Life of this patent
Estimating the term…
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.
Claims12
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:
- Δτ
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- the time delay compression metric being defined as the relative increase in RMS delay spread Δτ(R) at any point R compared to that at R0, the parameter being denoted as:
- σ
-
- (
- R
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- =
- Δτ
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- R
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- Δτ
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- R
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- where τ0 is such that
-
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- =
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- is the delay of the peak of the equivalent channel impulse response at the antenna when the authentication device is at its intended position;
- (f) repeating the steps for the wireless device, wherein the wireless device has a unique time reversal (TR) spatial-temporal authentication key;
- and
- (g) using a reconfigurable antenna in which a particular radiation pattern is generated to increase security and enhance system performance, wherein the generated particular antenna radiation pattern further comprises the step of identifying each radiation pattern state using a unique combination code of ON-OFF switches in control circuitry of the antenna.
302 more elements
A geo-security system, comprising:
- (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:
- η
- =
- 20
-
- log
- 10
-
- (
-
- h
- eq
-
- (
- t
- ;
- τ
- 0
- ,
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- ->
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- )
-
- max
- τ
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-
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- eq
-
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- t
- ;
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- ->
- R
- )
-
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- ,
- where R is the energy and T is the position at which the antenna is located.
50 more elements
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 temporal energy focusing with peak-to-side lobe ratio characterized by:
- η
- =
- 20
-
- log
- 10
-
- (
-
- h
- eq
-
- (
- t
- ;
- τ
- 0
- ,
- T
- ->
- R
- )
-
- max
- τ
-
-
- h
- eq
-
- (
- t
- ;
- τ
- ,
- T
- ->
- R
- )
-
- )
- ,
- where R is the energy and T is the position at which the antenna is located;
- (f) repeating the steps for the wireless device, wherein the wireless device has a unique time reversal (TR) spatial-temporal authentication key;
- and
- (g) using a reconfigurable antenna in which a particular radiation pattern is generated to increase security and enhance system performance, wherein the generated particular antenna radiation pattern further comprises the step of identifying each radiation pattern state using a unique combination code of ON-OFF switches in control circuitry of the antenna.
48 more elements
Dependencies are inferred from the claim text.