Performance of coherent direct sequence ultra wideband 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 iterative channel estimation and coherent detection to the DS UWB system. The purposes of this application are to provide resistance to intersymbol interference and multiple access interference, which severely affect the DS UWB system performance, and to increase the number of users sharing the UWB system. The iterative channel estimation and detection use interference cancellation algorithms subtracting the interference to achieve significant capacity gains with the lower BER and reduced transmit power required by the FCC. The DS UWB system performance is evaluated by analysis and simulations. The purpose of this study is to create a framework for designing a robust, ultra high data rate and reliable UWB system.