TAILIEUCHUNG - Báo cáo sinh học: " Research Article Fast Multi-Symbol Based Iterative Detectors for UWB Communications"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Fast Multi-Symbol Based Iterative Detectors for UWB Communications | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 903161 10 pages doi 2010 903161 Research Article Fast Multi-Symbol Based Iterative Detectors for UWB Communications Qi Zhou 1 Xiaoli Ma 1 and Vincenzo Lottici2 1 School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 USA 2 Department of Information Engineering University of Pisa 56122 Pisa Italy Correspondence should be addressed to Qi Zhou qzhou32@ Received 1 November 2009 Accepted 20 May 2010 Academic Editor Tim Davidson Copyright 2010 Qi Zhou et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Ultra-wideband UWB impulse radios have shown great potential in wireless local area networks for localization coexistence with other services and low probability of interception and detection. However low transmission power and high multipath effect make the detection of UWB signals challenging. Recently multi-symbol based detection has caught attention for UWB communications because it provides good performance and does not require explicit channel estimation. Most of the existing multi-symbol based methods incur a higher computational cost than can be afforded in the envisioned UWB systems. In this paper we propose an iterative multi-symbol based method that has low complexity and provides near optimal performance. Our method uses only one initial symbol to start and applies a decision directed approach to iteratively update a filter template and information symbols. Simulations show that our method converges in only a few iterations less than 5 and that when the number of symbols increases the performance of our method approaches that of the ideal Rake receiver. 1. Introduction Ultra-wideband UWB impulse radio IR transmits ultrashort pulses at low .

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