Security performance analysis for cooperative communication system under Nakagami-m fading channel

In this paper, we investigate the secure transmission problem of cooperative communication systems where a potential malicious eavesdropper is existing. Based on the more general Nakagami-m fading channels, we adopt a strategy to improve the system security performance by decoding and forwarding signals at the relay as well as sending interference signals simultaneously. In this model, the outage probability and the intercept probability which represent reliability and security respectively are derived, meanwhile, the influence of the power allocation of each node on the system performance is discussed. Simulations are provided to analyze the tradeoff between reliability and security of the system, and the variation in tradeoff performance under different power allocation.