Sun, 06 Jul 2008 11:07:09 BST CiteULike: dcastros Yin http://www.citeulike.org/user/dcastro/author/Yin CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2813856 <i>Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, Vol. 1 (2000), pp. 103-107 vol.1.</i><br /><br />In this paper we present a novel loading algorithm for OFDM-based multiuser communication system to maximize the total system throughput while satisfying the total power and users' rate constraints. The new scheme determines the subcarrier, bit, and power allocation by decoupling an NP-hard combinatorial problem into two steps: (1) resource allocation (how much power and how many subcarriers for each user) based on users' average channel gains and their rate requirements; and (2) subcarrier assignment and bit loading based on users' channel profiles across all subcarriers. Compared to existing iterative methods, the two-step approach offers comparable capacity gain with much lower complexity An efficient multiuser loading algorithm for OFDM-based broadband wireless systems H Yin H Liu doi:10.1109/GLOCOM.2000.891705 Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE, Vol. 1 (2000), pp. 103-107 vol.1. 2008-05-19T18:32:45-00:00 2000 Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE 1 103 107 vol.1 allocation broadband ofdm power wireless http://www.citeulike.org/user/dcastro/article/1870048 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 54, No. 7. (2006), pp. 2902-2909.</i><br /><br />Microwave components with nonlinear phase responses are developed using a simplified composite right/left-handed (CRLH) transmission-line (TL) structure without the series capacitance or the shunt inductance. Using such a simplified CRLH structure, arbitrarily dual-band microstrip components have been realized in compact sizes such as a quarter-wavelength short-circuited stub and dual- band branch-line couplers. Simulation and measurement results are given to demonstrate the efficiency and good performance of the proposed components. For the quarter- wavelength short-circuited stub based on the simplified CRLH-TL structure without the series capacitance, it has been shown that the insertion loss is less than -0.1dB. For the arbitrarily dual-band branch-line coupler, experiment results exhibit that S/sub 21/ and S/sub 31/ are larger than -3.6dB, the isolations are smaller than -30dB, the return losses are smaller than -20dB, and the phase differences are within 90/spl deg//spl plusmn/1.8/spl deg/. Arbitrarily dual-band components using simplified structures of conventional CRLH TLs Xian Lin Ruo Liu Xin Yang Ji Chen Xiao Yin Qiang Cheng Tie Cui Microwave Theory and Techniques, IEEE Transactions on, Vol. 54, No. 7. (2006), pp. 2902-2909. 2007-11-05T20:33:09-00:00 2006 Microwave Theory and Techniques, IEEE Transactions on 54 7 2902 2909 component crlh dual-band structure http://www.citeulike.org/user/dcastro/article/1856858 <i>Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 1 (2005), 4 pp..</i><br /><br />In this paper, new structures with nonlinear phase responses are proposed based on the composite right /left-handed (CRLH) transmission lines. Using such improved CRLH structure, arbitrary dual-band microstrip components have been realized, such as a quarter-wavelength open/short-circuited stub, and a dual-band branch-line coupler, etc. This has been demonstrated by both simulated and measured results. Compared to the conventional CRLH structures, the novel components are more compact and are easier to be realized. Realization of arbitrary dual-band components using an improved CRLH transmission-line model Xian Lin Ruo Liu Xin Yang Ji Chen Xiao Yin Qiang Cheng Tie Cui Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings, Vol. 1 (2005), 4 pp.. 2007-11-02T17:41:40-00:00 2005 Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings 1 4 pp. component crlh dual-band model