%0 Journal Article
%T Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems<br>认知无线电下行链路中的频谱共享算法
%A Zhang Ran-ran Liu Si-yang Xie Gang Liu Yuan-an
%A <br>张然然
%A 刘思杨
%A 谢刚
%A 刘元安
%J 电子与信息学报
%D 2009
%I 
%X A spectrum sharing algorithm for downlink cognitive radio systems is proposed to maximize the system capacity under total transmission power and interference constraints. Interference to the licensed users is analyzed, and a method to set interference constraint is given accordingly. Based on the interference constraint, the maximum system capacity is achieved by two steps: first the optimal subcarrier allocation is derived by the maximum channel signal to interference plus noise ratio rule; then transmission power is optimally allocated by the proposed double water-filling method. Simulation results show this algorithm can provide significant capacity gain comparing with the conventional spectrum sharing algorithms.
%K Cognitive radio
%K Spectrum sharing
%K Maximum channel signal to interference plus noise ratio rule
%K Double water-filling method<br>认知无线电
%K 频谱共享
%K 最大信道信干噪比原则
%K 双注水方法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=7D532602B63F00869344F046CF8C7962&yid=DE12191FBD62783C&vid=4AD960B5AD2D111A&iid=94C357A881DFC066&sid=3395C64999261B75&eid=4997AFD17F6FADE1&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=10