Secure OFDM Transmissions With Coset-QAM
Kaiwen Zheng, Xiaoli Ma · IEEE Wireless Communications Letters · 2023
Modulation recognition for Orthogonal Frequency Division Multiplexing (OFDM) has many applications in commercial and surveillant communications (e.g., frequency spectrum monitor, military eavesdropping). In this letter, we propose a coset quadrature amplitude modulation (coset-QAM) technique with coset selection matrix to combat modulation recognition for OFDM. Numerical simulations show that the performance of the existing modulation classifiers is degraded dramatically even when the principle and coset selection matrix are known at the classifier. As a result, our coset-QAM largely improves the security compared with the traditional QAM with marginal error performance loss.