期刊名称：International Journal of Future Generation Communication and Networking
印刷版ISSN：2233-7857
出版年度：2014
卷号：7
期号：1
页码：159-168
出版社：SERSC
摘要：In this paper we investigate the problem of cooperative beamforming design in cognitive radio network with a primary network and a secondary network. In the secondary network, the two transmitters communicate by the help of relays each other, and the relays select the amplify-and-forward (AF). The aim of this paper is to minimize the total power of relays in the secondary network with the SNRs of two transmitters under constraints and the QoS requirement of the primary user. Therefore, we design an optimization model with constrains. We consider a SDP relaxation method and prove that there is a rank-one optimal solution which is the optimal solution of the original problem. So we obtain weights of the beamforming and the optimal power of relays. Moreover, we advise a reasonable number of the relays by numerical simulation
