Waveform Design for UWB Communications Based on Time-frequency Analyses

Coexistence and compatibility of spectrum are important aspects needed to be considered in impulse radio ultra-wideband(IR-UWB) communications.The proper waveforms of signal can decrease the influence of interference between the IR-UWB and existing systems,and improve the efficiency of spectrum resources. In this paper,based on time-frequency analyses,a novel method to design the waveforms of IR-UWB signals is proposed.The constructed waveforms are with raised cosine roll-off frequency spectrum and less time duration.Furthermore,series of time domain waveforms with orthogonal properties constructed by this method can be adopted at high-level modulated UWB systems.