Channels for delivery of spectra sensing results on dual-stage cognitive radio networks

Spectrum sensing is the most important function for cognitive radio networks. Since the probabilities of detecting primary users by secondary users can deteriorate under the influence of noise, interference, Rayleigh fading, it is necessary to choose the most suitable network architecture to improve the characteristics in both the delivery channels and in the sounding channels. This article discusses the task of sensing a licensed frequency band in order to detect the primary user of a cognitive radio network with a two-tier network architecture, on the first, lowest tier, secondary users are concentrated in separate small parts of the network coverage area (clusters) located at considerable distances from the center of the fusion of local sounding results individual secondary users. These local results are relayed by the base stations of the clusters to the merger center.