Spectrum Sensing for Cognitive Ultra-wideband Based on Fractal Dimensions

Band the merits of cognitive ultra-wideband (CUWB) and fractal dimensions together, this paper presented a spectrum sensing method employing the difference of fractal box dimension and information dimension between noise and primary signals through taking double threshold strategy. For the purpose of meeting the need of spectrum sensing in CUWB, this method selects information dimension as the recognition characteristic parameter to recognize signal modulation mode. Simulation results show that the spectrum sensing method based on fractal dimensions is not sensitive to the noise and has a good sensing performance with low computational complexity, and it is able to realize modulation recognition effectively, as a whole, the method is fit for CUWB system.