Patent ID: 11943621
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. A method of data transmission, performed by a wireless device, the method comprising:
determining a first value for a localization tone;
generating a modified localization tone such that, after whitening and encrypting, the modified localization tone returns to the first value;
inserting the modified localization tone into a data packet at an application layer of a communication protocol stack, the modified localization tone preceding data of a payload of the data packet and having a last bit immediately preceding a first bit of the data of the payload;
whitening the data packet after inserting the modified localization tone into the data packet;
encrypting the data packet after inserting the modified localization tone into the data packet; and
transmitting the data packet after the whitening and the encrypting the data packet, wherein the generating the modified localization tone comprises:
performing Decrypt_AES(IV,SK,array(bit_i)), wherein Decrypt_AES is an established algorithm according to the Advanced Encryption Standard (AES) encryption protocol, IV is an initialization vector, SK is a session key, and bit_i is the localization tone, and
for each bit of the modified localization tone:
estimating an output of a linear feedback shift register; and
performing an exclusive-OR operation of a constant value and the estimated output of the linear feedback shift register based on a respective bit of the modified localization tone being considered and a position of that respective bit of the modified localization tone in the data packet.