Patent ID: 9558607
Date: 2017-01-31
CPC Classifications: G07C

Claim:
1. A passive keyless entry receiver system, comprising: a receiver configured to receive a wireless signal having a data packet with a payload comprising a plurality of different power levels having a plurality of peak RSSI (Receive Signal Strength Indicator) levels corresponding to the plurality of different power levels; a plurality of RSSI peak payload registers, respectively configured to store one of the plurality of peak RSSI levels for a RSSI step of the payload; a RSSI difference register configured to store one or more RSSI differences between the plurality of peak RSSI levels; a comparison element configured to compare the one or more RSSI differences to one or more expected RSSI differences to determine if the plurality of different power levels correspond to an expected sequence of power level differences; one or more RSSI start registers configured to store starting positions of one or more RSSI steps within the payload; and one or more RSSI stop registers configured to store stopping positions of the one or more RSSI steps within the payload, wherein the starting positions and the stopping positions define a plurality of distinct ranges within the data packet that correspond to the one or more RSSI steps over which peak values are measured.