A novel blind multi-antenna spectrum sensing scheme based on phase difference in frequency domain

In this paper, a novel multi-antenna spectrum sensing scheme utilizing phase difference between antennas in frequency domain is proposed. Different from other multi-antenna spectrum sensing schemes just combining signal information from every antenna, the proposed scheme attempts to make use of the information between different antennas with the help of multi-antenna technology. As no prior information of signals is required, the proposed scheme can be seen as a kind of blind sensing (BS) schemes. Its theoretical analysis as well as practical implementation is designed based on the least squares(LS) estimation. The simulation results suggest that the proposed scheme is capable of achieving a better performance even under the condition of moderately low signal-to-noise ratio (SNR) and small number of symbols.