说明：  资源分配是认知无线电的核心问题之一。MIMO 认知无线电系统和单天线系统相比，不仅能获取频率、时域信息，还能获取空域、码域信息，在资源分配中有效的利用这些信息对进一步提高无线通信的频谱利用率具有重大意义。
(Allocation of resources is one of the core issue of the MIMO cognitive radio. MIMO cognitive radio system and the single antenna system, expansion of the null frequency of multi-dimensional information, the information provided by the utilization system of resource allocation can improve system performance. )