Phase Noise Resistant and PAPR Suppressing Secure Chaotic OFDM System via Carrier Interferometry Spreading

Abstract

In this paper, we present a carrier interferometry-aided chaotic orthogonal frequency division multiplex system for secure information transmissions over wireless channels, with an aim to address the performance degradation issues induced by the imperfect operating conditions of oscillators and amplifies. Therein the data are encoded by chaotic chips, then are spread by the carrier interferometry (CI) codes over multiple sub-carriers. Thus, the signals to be transmitted via multiple sub-carriers can behave in a chaotic fashion to achieve secure transmissions over broadcasting wireless channels, whereas the spreading in the frequency domain achieved by CI codes is exploited to reject the phase noise and suppresses the peak to average power ratio (PAPR). Furthermore, we derive the signal-to-noise-plus-interference ratio expressions for bit error rate (BER) analysis. Simulations are performed over additive white Gaussian channel and Rayleigh fading channels. The results verify the effectiveness of theoretical analysis and demonstrate that our presented system can achieve better PAPR and BER performances than those of the benchmark schemes.