A CUWB pulse design method based on CSS

To cope with the interference between UWB system and traditional narrow band wireless systems, CR (Cognitive Ratio) technology is introduced into UWB. The CUWB (Cognitive UWB) system realized by IR needs to generate sending pulse waveform whose spectrum can be adapted to the changing spectrum environment. In this paper, a CUWB pulse design method based on CSS is presented. The pulses designed by this method satisfy the requirements of FCC transmission mask, have low side lobe, and when the environment change is detected by spectrum sensing, they can be adapted to reach desired spectrum requirements by adjusting combined chirp and subband parameters. The method is realized easier, have lower computational complexity, and also can obtain multiple quasi-orthogonal pulse waveforms which can be used for shape modulation and multiple access.