【摘要】 针对认知无线电网络中主要用户受到的干扰问题和次要用户的性能问题,采用双向中继协议进行次要用户间通信。提出一种中继处理算法将中继站发射的信号投影到中继站和主要用户间干扰信道子空间的垂直方向,消除中继站发射信号对主要用户造成的干扰。同时在次要用户端运用凸优化理论进行最优功率控制,以实现抑制次要用户端对主要用户的干扰并提高次要用户总速率的目的。仿真结果表明所提算法在抑制次要用户对主要用户干扰的基础上与平均功率分配算法相比显著提高了次要用户的总速率。更多还原

【Abstract】 To limit the interference to primary users and improve the performance of secondary users, a two-way relaying was employed in cognitive radio networks. First, a relay processing scheme was proposed to eliminate the interference to primary users caused by relay station transmission, which had projected the signals from the relay station to the orthogonal space of the interference subspace between the relay station and primary users. Besides, by using convex optimization theory, the optimal power control policy of the secondary users was obtained to suppress their interference to primary users and to improve the sum rate of their own. Simulation results show that the proposed algorithm not only suppresses the interference to primary users but also improves the sum rate of secondary users greatly.更多还原