Performance Analysis of a Dynamic Spreading Spectrum Strategy Based Spectrum Sharing for Cognitive Radio Networks

This paper presents a performance analysis of a spectrum sharing model which based on dynamic spreading spectrum approach for cognitive radio networks. This model consists of two phases: In the first, if the sensing results show that the primary user (PU) is inactive, the secondary user (SU) can transmit data based on its own benefit. In the other hand, if the PU is active, the SU can coexist with the PU and maintain its communication by adopting dynamic spreading spectrum method. Here, we analyzed performance of this model under both interference constraints for PU and quality of service (QoS) constraints for SU. We also compared the performance of this model to the opportunistic spectrum access model to show the performance superiority. Simulation results are presented to verify our analyses, and the results also show that the spectrum sharing scheme can achieve much better performance compared to the previously opportunistic spectrum access model.