Mixing chaos modulations for secure communications in OFDM systems
Department of Electrical and Computer Engineering, University of Calgary,
2500 University Drive NW,
T2N 1N4, Canada
Received in final form: 18 February 2017
Published online: 28 December 2017
In this paper, we consider a novel chaotic OFDM communication scheme is to improve the physical layer security. By secure communication we refer to physical layer security that provides low probability of detection (LPD)/low probability of intercept (LPI) transmission. A mixture of chaotic modulation schemes is used to generate chaotically modulated symbols for each subcarrier of the OFDM transmitter. At the receiver, different demodulators are combined together for the different modulation schemes for enhanced security. Time domain, frequency domain and statistical randomness tests show that transmit signals are indistinguishable from background noise. BER performance comparison shows that the physical layer security of the proposed scheme comes with a slight performance degradation compared to conventional OFDM communication systems.
© EDP Sciences, Springer-Verlag 2017