Patent ID: 8570144
Filing Date: 2013-10-29
Classification: B60R,G07C,H04L,H04W

Abstract:
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.