Detecting UWB signals using cyclic features

Ultra wideband (UWB) signals facilitate efficient spectrum usage via coexistence with other narrowband signals. The detection of UWB signals under the coexistent narrowband signals is extremely important for UWB commercial and military purposes. Inherent cyclostationarity of the UWB signals provides unique features different from those of narrowband signals. In this paper, we investigate the cyclic features of a generalized UWB impulse radio (IR) signal. In order to detect UWB IRs under the existence of a narrowband signal (e.g. a GMSK signal), we explore both the nonconjugate and the conjugate cyclostationarity. A multi-cycle detector is proposed in time-domain making use of the conjugate cyclic autocorrelation to detect the UWB signal under the existence of the GMSK signal. The simulation results indicate the possibility to detect the UWB signal which is overwhelmed by the GMSK signal.