CPC B60R 25/245 (2013.01) [H04B 17/318 (2015.01); H04W 4/029 (2018.02)] | 20 Claims |
1. A system for hands-free access to a vehicle, said hands-free access system comprising:
a hands-free access device of said vehicle configured to:
transmit a location frame, said location frame comprising a modulated signal and a pure carrier signal transmitted during time windows at different time intervals,
receive at least one measurement of a received signal strength of a primary received signal performed on said pure carrier signal by a hands-free identifier, and
receive information on an absence or presence of noise in said location frame, said information being sent by said hands-free identifier,
wherein, depending on said at least one measurement of the received signal strength of a primary received signal and on said information on the absence or presence of noise, authorize or prevent access to said vehicle,
a hands-free identifier configured to:
receive said location frame transmitted by said hands-free access device of said vehicle,
perform at least one measurement of the received signal strength of a primary received signal on said pure carrier signal of said location frame,
send said hands-free access device said at least one measurement of the received signal strength of a primary received signal,
check the presence of noise in said location frame, and
send the hands-free access device information on the absence or presence of noise in said location frame.
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