Spectrum Sharing Paradigm Under Primary Interference and Nakagami-m Fading: Security Analysis

Abstract

The spectrum sharing paradigm is a promising countermeasure to the spectrum under-utilization problem. However, it causes both primary interference (inflicted by primary transmitters upon secondary receivers) and secondary interference (inflicted by secondary transmitters upon primary receivers) and un-secures information transmission. Most works ignored the primary interference and considered the Rayleigh fading in evaluating the information security of the spectrum sharing paradigm. This paper generalizes these works with considerations of the primary interference and the Nakagami-m fading. First, the exact expression of the secrecy outage probability is proposed for the spectrum sharing paradigm under considerations of both primary/secondary interferences, the Nakagami-m fading, and the peak transmit and interference power constraints. Then, computer simulations are provided to corroborate the proposed expression. Finally, numerous simulation/theory results are generated to assess the security performance in key system parameters such as the fading severity degree, the primary interference level, the peak transmit power, the peak interference power, the security threshold.