CPC H04B 5/0031 (2013.01) [H04B 7/0602 (2013.01); H04B 17/318 (2015.01); H04W 76/15 (2018.02); H04L 67/12 (2013.01)] | 15 Claims |
1. An apparatus for securely transferring first data comprising a plurality of bits to a target device that uses a single receive antenna, the apparatus comprising:
a first antenna;
a second antenna positioned a fixed distance from the first antenna such that a received signal strength indicator (RSSI) for the first antenna measured at the target device will be different than an RSSI for the second antenna;
a transmitter; and
a processor configured to control the transmitter to transmit a first signal containing second data in packets, the processor causing the transmitter to transmit packets of the first signal with the first antenna and the second antenna by switching between the first and second antennas based upon bits of the first data; and
wherein the second data does not include the first data and the target device receives the first data by detecting the RSSI of the transmitted packets of the first signal.
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