Power allocation schemes in OFDM-based femtocell networks

NCUIR > College of Electrical Engineering & Computer Science > Department of Communication Engineering > journal & Dissertation > Item 987654321/106064

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/106064

Title:	Power allocation schemes in OFDM-based femtocell networks
Authors:	陳永芳;Pao, Wei-Chen;Chen, Yung-Fang;Chan, Chia-Yen
Contributors:	資訊電機學院通訊工程學系
Keywords:	Algorithmics. Computability. Computer arithmetics;Allocations;Applied sciences;Cellular communication;Communications Engineering;Computer Communication Networks;Computer science;control theory;systems;Computer simulation;Engineering;Exact sciences and technology;Networks;Optimization;Orthogonal Frequency Division Multiplexing;Radiocommunications;Searching;Signal,Image and Speech Processing;Subcarriers;Telecommunications;Telecommunications and information theory;Theoretical computing
Date:	2013-04-01
Issue Date:	2026-04-23 13:07:02 (UTC+8)
Publisher:	Springer Netherlands;Boston: Springer US
Abstract:	摘要： Orthogonal frequency division multiplex-based femtocell networks in downlink with two-tier interference are considered in this paper. In order to satisfy the quality of service of macrocell users, a capacity maximization problem with the total and the upper power constraints by allocating power to subcarriers for a user in femtocell systems becomes important. In this paper, the optimal power allocation is derived by using the Lagrangian technique. Based on the analysis of the Karush-Kuhn-Tucker conditions, subcarriers can be classified into two sets with different power allocation strategies according to the upper power constraint. One set of subcarriers is allocated with upper power, and the other set of subcarriers is processed by using the waterfilling approach. A direct linear search scheme is presented to achieve the optimal performance by finding the threshold over the channel states of all subcarriers to determine the two sets. In order to reduce the computational load, a reduced complexity scheme is designed for the optimal solution by utilizing the relationship of the allocated power in the two sets of subcarriers. Unlike the schemes in iterative manners, a fast power allocation scheme with a near-optimal performance is also developed. Simulation results reveal that the proposed schemes outperform the existing scheme. The efficacy of the proposed schemes is demonstrated in the simulations. 其他題名： Wireless Pers Commun 出版者： Boston: Springer US 出版日期： 2013-04-01 出處： Wireless personal communications, 2013-04, Vol.69 (4), p.1165-1182 版權： Springer Science+Business Media, LLC. 2012 版權： 2014 INIST-CNRS 識別號： ISSN: 0929-6212 識別號： EISSN: 1572-834X 識別號： DOI: 10.1007/s11277-012-0626-2
Appears in Collections:	[Department of Communication Engineering] journal & Dissertation

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