Modified Chirp Waveforms for Cognitive Ultra Wideband Radio - Work in Progress

Cognitive Radio (CR) is an intelligent wireless communication system which is aware of its environment and can adjust its spectrum to utilize the frequency holes in the wireless environment. By this way, a highly efficient utilization of the radio resource can be achieved. We propose a novel CR modulation method that is based on the Ultra-wideband (UWB) chirp waveform in this paper. Only time domain processing is required to utilize the free radio resources named by spectrum hole in the proposed system. Due to the avoidance of the frequency domain processing, system complexity and power consumption can be reduced by the proposed scheme. We discuss the design method of the proposed scheme and compare it with traditional CR schemes. In addition, we give out the system performance of the proposed scheme based on some interference scenarios by simulation. The simulation results express that the proposed scheme can utilize the spectrum hole efficiently.