| CPC H04W 12/122 (2021.01) [G01S 3/48 (2013.01); H01Q 3/36 (2013.01); H04W 4/029 (2018.02)] | 21 Claims |
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1. A system to detect a malicious attack during an Angle of Departure operation, comprising:
a network device, comprising:
a wireless network interface, wherein the wireless network interface comprises an antenna array having a plurality of antenna elements and an analog multiplexer, wherein the wireless network interface transmits a signal from an antenna element of the antenna array;
a processing unit; and
a memory device, comprising instructions, which when executed by the processing unit, enable the network device to:
generate an antenna switching pattern;
transmit a packet that includes a constant tone extension (CTE) to a tag device, wherein the CTE comprises a tone having a known frequency and wherein the CTE comprises a plurality of switch slots and a plurality of sample slots, wherein the antenna element used to transmit the CTE during each sample slot is determined from the antenna switching pattern; and
transmit the antenna switching pattern to a position engine; and
the position engine, comprising:
a wireless network interface, wherein the wireless network interface comprises an antenna;
a processing unit; and
a memory device, comprising instructions, which when executed by the processing unit, enable the position engine to:
receive the antenna switching pattern from the network device;
receive data indicative of a received CTE signal from the tag device; and
based on phase information obtained from the data indicative of the received CTE signal, perform an action if a malicious phase attack is detected.
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