针对最新的基于特征值确定门限的检测方法,引入多认知用户MIMO环境,提出了基于特征值确定门限的协作MIMO频谱感知,充分利用了MIMO技术的优点来提高感知性能,利用随机矩阵理论推导出决策门限的准确表达式,改进了传统基于特征值算法需要大量协作用户的缺点。理论分析和仿真结果均表明,新的决策规则不仅减少了计算复杂性,整体性能也优于同类算法和典型的能量检测算法。
To improve the effectiveness of eigenvalue-based detection in cognitive radio, the multi-cognitive-user MIMO circumstance is introduced, and a new exact threshold for frequency band sensing is proposed based on random matrix theory. The advantages of MIMO technology is used to improve detection performance. Both theoretical analysis and the simulation results show that the new algorithm outperforms similar algorithms and classical energy detection techniques.