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Receiver Techniques for Ultra-wide-band Multiuser Systems over Fading Multipath Channels  

Zhou, Xiaobo (Dept. of Electrical Engineering, Texas A&M University)
Wang, Xiaodong (Department of Electrical Engineering, Columbia University)
Publication Information
Journal of Communications and Networks / v.5, no.2, 2003 , pp. 167-173 More about this Journal
Abstract
We treat the problem of channel estimation and interference cancellation in multiuser ultra-wide-band (UWB) communication systems over multipath fading channels. The UWB system under consideration employs a random time-hopping impulse radio format. We develop a channel estimation method based on linear weighted algorithm. An iterative channel estimation and interference cancellation scheme is proposed to successively improve the receiver performance. We also consider systems employing multiple transmit and/or receive antennas. For systems with multiple receive antennas, we develop a diversity receiver for the wellseparated antennas. For systems with multiple transmit antennas, we propose to make use of Alamouti’s space-time transmission scheme, and develop the corresponding channel estimation and interference cancellation receiver techniques. Simulation results are provided to demonstrate the performance of various UWB receiver techniques developed in this paper.
Keywords
Ultra-wide-band communication system; multipath fading; pilot-aided channel estimation; channel re-estimation; interference cancellation; space-time coding; diversity;
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