Wake Channel Indication for Passive Entry System
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United States of America Patent
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Issued Date -
Nov 15, 2012
app pub date -
May 10, 2012
filing date -
May 12, 2011
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Abstract
A passive entry system receives an electromagnetic interrogation signal transmitted from an interrogation antenna to a remote transponder, wherein the interrogation signal includes a wakeup pattern data sequence. A plurality of channel signals is generated within the transponder from a corresponding plurality of antennas in response to the electromagnetic interrogation signal. Bit detection is performed on each of the plurality of channel signals to detect the wakeup pattern sequence. A received signal strength indicator (RSSI) of the interrogation signal is determined using the plurality of channel signals, wherein only channel signals on which a valid wakeup pattern sequence is detected are used for determining the RSSI. A wakeup signal is asserted to wake up a processing module in the remote transponder only when the wakeup pattern sequence is detected on at least one of the plurality of channel signals.
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