基于频域相位差信息的多天线频谱检测方法研究

Method for Multi-Antenna Spectrum Sensing Utilizing Phase Difference in Frequency Domain Between Received Signals

目前多天线频谱检测主要通过对信号能量、循环平稳性等信息进行统计判决实现。针对这一问题,考虑多天线的接收环境,提出一种利用接收信号间频域相位差信息进行频谱检测的算法,并将最小二乘估计应用到实际的频谱检测过程。理论分析与仿真结果表明,在接收环境较差时,本算法依然可以保持较好的频谱检测性能。

In this paper, a multi-antenna spectrum sensing method utilizing phase diff^rence in fre- quency domain between received signals is proposed. Different from most of the other multi-antenna spectrum sensing methods which mainly refer to signal features such as signal energy and cyclosta- tionary, the method proposed attempts to use the phase differences in frequency domain between re- ceived signals resulted from the use of multi-antenna. Theoretical analysis of the proposed method as well as the practical implementation is based on the least squares estimation （LSE）. Simulation re- sults suggest that the proposed method is capable of achieving a good spectrum sensing performance, even in the presence of moderately low SNR and small number of symbols.