Design of Blind Mobile Receiver in UWB Communication System Empolying Time-Hopping PAM Modulation

Ultra wideband (UWB) impulse radio technology has recently spurred great interest for the applications in short range high-speed wireless multiple access system. Among the various modulation and multiple access schemes, this paper deals with time-hopping (TH) antipodal pulse amplitude modulation (PAM) operating in the presence of multipath fading downlink channel. We develop two types of low-complexity mobile station (MS) receivers. One is based on the RAKE reception scheme and the other is designed to meet the minimum output energy (MOE) criterion. However, since accurate channel information is crucial for reliable operation, thereby we propose a subspace-based blind channel estimator. Simulation results show that the MOE receiver outperforms the RAKE receiver in multiuser environment. Moreover, both the channel estimation algorithm and the MOE reception schemes are shown to be near-far resistant