Abstract:
The recent rapid growth in technology and the successful commercial deployment of wireless communications are significantly affecting our daily lives. As the demand for higher capacity, faster service, and more secure wireless connections increases, new enhanced technologies have to find their place in the overcrowded and scarce radio frequency (RF) spectrum. Two technologies are considered for solving these problems: Cognitive radio (CR) system and Ultra-wideband (UWB) system One of the main concepts of the CR is that the targeted frequency spectrum is scanned periodically in order to check its availability for opportunistic usage. Since at different times and locations the available bands can be changed, CR is expected to have a high flexibility in determining the spectrum it occupies. This requires the CR to be capable of modifying its transmitted pulse in such a way that the spectrum of the pulse fits into the available bands. On the other hand, Ultra-wideband (UWB) technology offers a promising solution to the radio frequency spectrum drought by allowing new services to coexist with current radio systems with minimal or no interference. From the advantage of two systems, in 2006, the new technology that combines two systems together and called is Ultra-wideband cognitive radio (UWB-CR). Therefore, in this paper, we consider our system under UWB-CR system. In this paper, we propose a novel pulse shape design for UWB-CR system. The proposed pulse has the power spectral density (PSD) complied with the Federal Communications Commission (FCC) spectral mask and this pulse also resists to timing jitter effect. Moreover, our pulse can reduce the TOA estimation error. The accuracy of TOA estimation is evaluated by root mean square error (RMSE).