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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: Research Article Downlink Resource Allocation for Autonomous Infrastructure-based Multihop Cellular Networks | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 727196 14 pages doi 10.1155 2009 727196 Research Article Downlink Resource Allocation for Autonomous Infrastructure-based Multihop Cellular Networks Mahdi Shabany1 and Elvino S. Sousa2 1 Department of Electrical Engineering Sharif University of Technology P.O. Box 11365-8639 Tehran Iran 2 Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto ON Canada M5S 3G4 Correspondence should be addressed to Mahdi Shabany mahdi@eecg.toronto.edu Received 18 July 2008 Revised 7 December 2008 Accepted 15 February 2009 Recommended by Joerg Kliewer Considering a multihop cellular system with one relay per sector an effective modeling for the joint base-station relay assignment rate allocation and routing scheme is proposed and formulated under a single problem for the downlink. This problem is then formulated as a multidimensional multichoice knapsack problem MMKP to maximize the total achieved throughput in the network. The well-known MMKP algorithm based on Lagrange multipliers is modified which results in a near-optimal solution with a linear complexity. The notion of the infeasibility factor is also introduced to adjust the transmit power of base stations and relays adaptively. To reduce the complexity and in order to analyze the underlying key factors in the system the framework is restricted to a two-base-station two-relay system. In fact the output of the proposed algorithm is the joint optimization of the routing path and base-station selection to achieve the maximum total throughput in the system which in conjunction with the proposed adaptive scheme leads to the implementation of the cell breathing via allocating the proper transmit power to the basestations and relays. Copyright 2009 M. Shabany and E. S. Sousa. This is an open access article distributed under the Creative Commons Attribution License which permits .
