Robustness of the Tomlinson-Harashima Precoder in Physical-layer Security to Attacks with Non-linear CMA

Physical-layer security techniques have proven to be a good alternative to the computational high-cost traditional security mechanisms for wireless communications. In this work, the secrecy level provided by a Tomlinson-Harashima precoder is evaluated in a scenario in which the eavesdropper is allowed to perform extra signal processing at the received signal, aiming to recover the confidential information. The results indicate that even with the extra effort using unsupervised channel equalization methods, the eavesdropper is not able to totally recover the information.