outage analysis for novel selection cooperation in multi-source cognitive networks
A novel selection cooperation scheme for cognitive nodes (Cog-Sel scheme) in multiple sources cooperative networks is presented and the outage probability is derived. In the proposed scheme, the source chooses a single optimal relay or transmits directly to the destination in terms of the SNR between the source-destination pair with some feedback. Each node can "smartly" utilize the idle frequency band to transmit signal using cognitive radio technology. Therefore, no extra channel resources are allocated for cooperation and the system encounters no bandwidth losses. The outage probability of the proposed scheme is analyzed and the result reveals that it outperforms the conventional relaying strategies such as simple selection and opportunistic relaying schemes. These benefits contribute to the efficient use of power and channel resources. Theoretic analysis and numerical simulation results are presented to verify our analysis.
selection cooperation cognitive network outage probability decode-and-forward cooperative diversity