This paper describes the configuration of a typical time-hopping

pulse position modulated(TH-PPM) signal for ultrawide-band(UWB) systems and the time-domain properties of the Gaussian pulse and its autocorrelation function are derived.An antenna array model for UWB communication systems is introduced and the peak-amplitude pattern is defined and simulated.Simulative results indicate that the beam width grows narrower when the array number gets large.It also provides a rapid bi-searching beamforming algorithm.Simulations show that the convergent steps of the algorithm are between one and fifteen.The algorithm could electronically steer the beam axis to the direction of the source signal and the optimum signal reception is achieved.