Author(s): Shuya Dong, Xiaoqin Wu, Yong Bai
Abstract: Wideband spectrum sensing capability can be enabled in GNU Radio, which is an open source software radio platform. In order to improve the detection performance of GNU Radio in practice, we studied its approach of wideband spectrum sensing, i.e., multistep frequency-domain energy detection. We first gave a detailed analysis of the functions and implementation details in its wideband spectrum sensing procedure. Then, we simulated the whole procedure of the wideband spectrum sensing by using MATLAB. With the simulation results, we discussed the factors influencing the decision threshold of energy detection and proposed a method to determine the decision threshold for each step in the multistep detection. The results presented in this paper can be used for setting parameters of GNU Radio to achieve more precise spectrum sensing.