Patent ID: 9608803
Date: 2017-03-28
CPC Classifications: H04L,H04N,H04W

Claim:
1. A method for defense against primary user emulation attacks in cognitive radio networks comprising the steps of: generating an advanced encryption standard (AES)-encrypted reference signal with a transmitter for transmitting to at least one receiver; allowing a shared secret between the transmitter and the at least one receiver; regenerating the reference signal at the at least one receiver and using the regenerated reference signal to achieve accurate identification of authorized primary users as well as malicious users; analyzing an auto-correlation of the received reference signal by the at least one receiver; detecting by the at least one receiver whether the primary user is present or not by comparing a cross-correlation between the received reference signal and a received signal to a predetermined threshold; and concluding that the primary user is present if the cross-correlation is greater than the predetermined threshold and concluding that the primary user is not present if the cross-correlation is less than the predetermined threshold.