Capacity of cognitive 2-way Relaying Systems with Nakagami –m Fading

I need to derivative the exact cumulative distribution function (CDF) of the secondary network's elective signal-to-interference-plus-noise-ratio (SINR) is derived in closed-form expression. Then, using this derived CDF, the SINR's moment generating function (MGF) is derived in closed-form tight approximate expression, which is exploited to compute the secondary network's capacity in accordance to the MGF method, the ergodic capacity expression, and system capacity.