Field Superposition System and Method Therefor
First Claim
1. A method of wireless communication between a vehicle base station and a transponder, the method comprising:
- driving interior and exterior antennas using first driving currents, the interior antenna being separated from the transponder by a portion of a vehicle in which the vehicle base station resides;
detecting separate vector components of the respective fields emitted by the interior and exterior antennas and received at the transponder;
calculating superposition factors for the interior and exterior antennas based upon the separate vector components;
concurrently driving the interior and exterior antennas using the same phase, respectively using the first driving currents multiplied by the superposition factors; and
detecting superposed vector components of a superposed signal including signals from both antennas received at the transponder; and
authenticating the transponder in response to the detected superposed vector components being within an error-based range of the sum of the separate vector components for each of the interior and exterior antennas as multiplied respectively by the superposition factors for the interior and exterior antennas.
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Accused Products
Abstract
Wireless communications between a vehicle base station and a transponder are authenticated. Interior and exterior antennas are respectively driven using first driving currents, the interior antenna being separated from the transponder by a portion of a vehicle in which the vehicle base station resides. Separate vector components of the respective fields emitted by the interior and exterior antennas are received and detected at the transponder. Superposition factors are calculated for the interior and exterior antennas based upon the separate vector components. Each of the interior and exterior antennas is concurrently driven using the same phase, respectively using the driving currents multiplied by the superposition factors. Superposed vector components are detected for a superposed signal including signals from both antennas received at the transponder. The transponder is authenticated based on the detected superposed vector components for the superposed signal being within a noise-based range of the sum of the separate vector components for each of the interior and exterior antennas as multiplied respectively by the superposition factors for the interior and exterior antennas.
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Citations
20 Claims
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1. A method of wireless communication between a vehicle base station and a transponder, the method comprising:
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driving interior and exterior antennas using first driving currents, the interior antenna being separated from the transponder by a portion of a vehicle in which the vehicle base station resides; detecting separate vector components of the respective fields emitted by the interior and exterior antennas and received at the transponder; calculating superposition factors for the interior and exterior antennas based upon the separate vector components; concurrently driving the interior and exterior antennas using the same phase, respectively using the first driving currents multiplied by the superposition factors; and detecting superposed vector components of a superposed signal including signals from both antennas received at the transponder; and authenticating the transponder in response to the detected superposed vector components being within an error-based range of the sum of the separate vector components for each of the interior and exterior antennas as multiplied respectively by the superposition factors for the interior and exterior antennas. - View Dependent Claims (2, 3, 4, 5)
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6. A method for wirelessly communicating between a vehicle base station and a transponder, the method comprising:
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driving interior and exterior antennas respectively using transmission currents II and TO, the interior antenna being separated from the transponder by a portion of a vehicle in which the vehicle base station resides; at the transponder, measuring x1, yI and zI vector components of the field strength emitted by the interior antenna, measuring xO, yO and zO vector components of the received field strength emitted by the exterior antenna, and transmitting a signal indicative of the measured vector components to the vehicle base station; at the vehicle base station, calculating superposition factors n and m for respectively applying to the measured signals from the interior and exterior antennas, based upon the transmitted signal indicative of the measured vector components; at the vehicle base station, encrypting the superposition factors and transmitting the encrypted superposition factors to the transponder; concurrently transmitting signals from each of the interior and exterior antennas to the transponder using the same phase, respectively using transmission currents II*n and IO1*m; and at the transponder, measuring xS, yS and zS vector components of a superposed signal including the signals from both antennas, and authenticating the transponder in response to each of xS, yS and zS respectively being within an error-based range of the sum of the respective vector components of signals from each of the interior and exterior antennas, multiplied by the superposition factors. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for authenticating a wireless communication, the system comprising:
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a transponder configured to receive and detect separate vector components of respective fields emitted by interior and exterior antennas of a vehicle, the interior antenna being separated from the transponder by a portion of the vehicle; a vehicle base station configured to drive the interior and exterior antennas respectively using first driving currents for communicating with the transponder, and concurrently drive each of the interior and exterior antennas using the same phase, respectively using the driving currents multiplied by superposition factors calculated for the interior and exterior antennas based upon the separate vector components; the transponder being further configured to detect superposed vector components of a superposed signal including signals from both antennas received at the transponder; and the vehicle base station being configured to authenticate the transponder in response to the detected superposed vector components for the superposed signal being within an error-based range of the sum of the separate vector components for each of the interior and exterior antennas as multiplied respectively by the superposition factors for the interior and exterior antennas. - View Dependent Claims (17, 18, 19, 20)
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Specification