Direct Sequence UWB Receiver with Iterative Channel Estimation and Detection

Direct Sequence Ultra Wideband (DS UWB) technology is becoming high potential candidate for the new generation of wireless short range communications. This technique uses very short baseband pulses spreading over several GHz bandwidth and offers great flexibility and promising field for future high data rate wireless access. In this paper we propose the application of the iterative channel estimation and detection schemes to the DS UWB system. The signals in the investigated DS UWB system can be synchronous, or asynchronous, and are transmitted from different users in ultra high data rate ad hoc network. The purposes of this application are to provide the resistance to inter-symbol interference and multiple access interference, which severely affect to the DS UWB system performance, and to increase the number of users sharing UWB system. The iterative channel estimation and detection use the interference cancellation algorithms subtracting the interferences to achieve a significant capacity gains with lower BER and reduce transmit power required by FCC. The DS UWB system performance will be evaluated by mathematical analysis and numeric simulations. The purpose of this study is to create the framework for designing a robust, ultra high data rate and reliable UWB system