tailieunhanh - Báo cáo hóa học: " Interference Mitigation for Coexistence of Heterogeneous Ultra-Wideband Systems"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Interference Mitigation for Coexistence of Heterogeneous Ultra-Wideband Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 40380 Pages 1-13 DOI WCN 2006 40380 Interference Mitigation for Coexistence of Heterogeneous Ultra-Wideband Systems Yongjing Zhang 1 Haitao Wu 2 Qian Zhang 3 and Ping Zhang1 1 Beijing University of Posts and Telecommunications China 2 Microsoft Research Asia Beijing China 3 Hong Kong University of Science and Technology Hong Kong Received 29 August 2005 Revised 9 January 2006 Accepted 3 April 2006 Two ultra-wideband UWB specifications that is direct-sequence DS UWB and multiband-orthogonal frequency division multiplexing MB-OFDM UWB have been proposed as the candidates of the IEEE competing for the standard of high-speed wireless personal area networks WPAN . Due to the withdrawal of the standardization process the two heterogeneous UWB technologies will coexist in the future commercial market. In this paper we investigate the mutual interference of such coexistence scenarios by physical layer Monte Carlo simulations. The results reveal that the coexistence severely degrades the performance of both UWB systems. Moreover such interference is asymmetric due to the heterogeneity of the two systems. Therefore we propose the goodput-oriented utility-based transmit power control GUTPC algorithm for interference mitigation. The feasible condition and the convergence property of GUTPC are investigated and the choice of the coefficients is discussed for fairness and efficiency. Numerical results demonstrate that GUTPC improves the goodput of the coexisting systems effectively and fairly with saved power. Copyright 2006 Yongjing Zhang 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. 1. INTRODUCTION In recent years two novel ultra-wideband UWB technologies that is .

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