优化认知中继网络的MOS值

With the rapid development of the wireless communication,available frequency spectrum becomes more severe. The Cognitive Radio(CR) technology is envisioned as a primary solution for the spectrum scarcity problem in wireless communication networks. With the development of the multimedia application of the internet, the quality of the user' experience in the Internet has caused a concern. So, this paper studies mean opinion score(MOS) as the major index of quality of experience(QoE) in the cognitive relay network. The research is on basis of the user experience quality in amplify-and-forward(AF) relay cognitive network where the primary user shares the spectrum with some secondary users . QoE refers to the quality and performance of the user to the device, network and system, application or service, which is defined by the comfort of the business application. In this thesis, MOS is used to evaluate QoE. In this paper, we use two methods to solve the value of MOS, including the generalized eigenvalues and the semidefinite programming(SDP). In the result of the simulation, we compare the performance of the system with the above two methods.