基于干扰对齐的认知MIMO系统频谱共享与用户调度

摘要

In communication scenario with multiple cognitive radio (CR) multi-input multi-output (MIMO) users, signal processing algorithm was designed based on interference alignment (IA) such that transmissions of cognitive and autho-rized signal were carried out in mutual orthogonal sub-spaces. Conflict-free utilization of spare spatial channel(s) autho-rized by primary system was achieved by cognitive user. Moreover, the difference of spatial transmission performance originating from various channel matrices was exploited to implement appropriate user scheduling. Simulation results show that the proposed method can utilize spare spatial channel resource effectively and obtain multiuser diversity gain. On the premise that authorized service is protected from disturbing, transmission rate of cognitive user is improved.%在认知MIMO多用户通信场景中，设计基于干扰对齐的信号处理算法，将认知信号与授权信号通过相互正交的子空间进行传输，实现认知用户对授权系统空闲空间信道的无冲突利用，并根据不同信道矩阵的空间传输性能的差异，实现合理的用户调度。仿真结果表明，所提方法能够有效利用空闲空间信道资源，获得多用户分集增益，在不影响授权业务的前提下提高认知用户的传输速率。