Spectrum sensing using collaborative beamforming for Ad Hoc cognitive radio networks

Spectrum sensing is one of the most important technologies for cognitive radio. In order to decrease the effect of low SNR, and increase the reliability spectrum sensing performance, we propose a novel spectrum sensing approach, which collects the distributed collaborative beamforming signals as the test statistic to input the energy detector. In particular, the collaborative beamforming method can enhance the received SNR in the desired direction of mainbeam, and reduce the input noise power. The distributed second users construct Ad Hoc network by self-organized form, making use of collaborative beamforming scan space signal, and can provide the general direction information for potential primary user. The numerical simulation results show that the potential improvement in primary user detection performance.