Outage analysis of two-way cooperative spectrum sharing protocol under Nakagami-m fading

This paper illustrates the performance of a two-way cooperative spectrum sharing (CSS) protocol under Nakagami-m fading. In CSS protocol, primary and secondary systems operate over the same frequency band albeit with different priorities. The primary system which has higher priority seeks the assistance of low priority secondary system to improve its quality of service (QoS) in-exchange for allowing the secondary system to access its spectrum. In our proposed framework, we have two primary systems that are required to communicate in deteriorating channel conditions. As a consequence, the secondary system acts as a half duplex relay, thereby assisting in relaying of information between the primary systems. The secondary system in return is benefited by having opportunistic spectrum access (OSA). Closed form expressions for the outage probability of primary and secondary systems are derived by varying the shape parameter (m) and spread control parameter (Ω) of Nakagami-m fading channels. To validate the proposed analysis comparisons between the simulation and theoretical results are also presented.