Performance analysis of two-way AF relaying systems over cascaded generalized-K fading channels

In this paper, we investigate the performance of two-way amplify-and-forward (AF) relaying scheme over independent but not necessarily identically distributed (i.n.i.d.) cascaded generalized-K fading channels. We derive expressions for both upper and lower bounds on overall outage probability (OOP) for the considered two-way AF relaying system. Further, we derive tight closed-form approximate expressions for the OOP as well as for the average symbol error probability (ASEP) for the considered relaying system. We present simulation and numerical results to validate the proposed theoretical analysis, and to demonstrate the effects of various channel parameters on the overall system performance. Our results reveal that the overall system performance improves with increase in shadowing and/or fading parameters, as well as with decrease in number of cascading channels over two hops.