Spectrum sharing is one of key technologies in cognitive wireless networks. In order to eliminate interference between the authorized primary user and the cognitive user over the frequency selective channels of cognitive wireless networks, a new method of spectrum sharing is presented in this paper. It is made full use in the new method that the channels between different users are not relevant due to frequency selective fading in wireless communication systems; the general solution of the pretreatment matrix is obtained by solving the matrix equation; and both the primary user and the cognitive user transmitter are pretreated in the new scheme. To eliminate the interference between the primary user and cognitive user in cognitive wireless networks while effectively send and receive data. Theoretical analysis and simulation results show that the new method can effectively eliminate the interference between the primary and the cognitive user of two-way to achieve the equality of different users to share radio spectrum resources, which can improve the efficiency of spectrum utilization and alleviate the contradiction between the increasing requirement and the scarcity of spectrum resources at present and in the further. Furthermore, the new method is also applicable to different cognitive users for sharing spectrum.%频谱共享是认知无线网络关键技术之一.为消除认知无线网络中频率选择性信道下授权主用户与认知用户间的相互干扰,本文提出了一种新的频谱共享方法.该方法充分利用了无线通信系统中由信道的频率选择性衰落导致的不同用户信道的不相关性,通过求解矩阵方程获得预处理矩阵的通解,并在主用户和认知用户发射端分别进行预处理.从而实现认知系统中主用户与认知用户之间的相互零干扰,并使每个用户都可有效地传输数据.理论推导及系统仿真均表明,新方法可以有效地消除授权主用户与认知用户之间的双向干扰,实现不同用户平等地共享无线频谱资源.新方法可以提高频谱的利用率,一定程度上缓解无线频谱资源在当前及未来无线通信领域日益紧缺的矛盾.而且新方法也同样适用于不同认知用户之间共享频谱.
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