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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/45936


    Title: 多使用者正交分頻多工行動通訊系統中基於頻譜效率分析之資源配置原理與相關傳收技術研究---子計畫三:多使用者正交分頻多工系統之資源配置問題研究;A Study of Resource Allocation for Multi-User OFDM Systems
    Authors: 陳永芳
    Contributors: 通訊工程系
    Keywords: 正交分頻多工;正交分頻多重接取;資源配置;位元配置;波束合成;多重輸入輸出;空間多工;功率控制;OFDM;OFDMA;resource allocation;bit loading;beamforming;MIMO;spatialmultiplexing;power control;電信工程
    Date: 2008-07-01
    Issue Date: 2010-12-28 15:53:50 (UTC+8)
    Publisher: 行政院國家科學委員會
    Abstract: 根據系統所需限制及使用者需求條件之下,本計畫將針對多使用者OFDM及OFDMA細胞架構下之資源配置研究。在OFDM系統,主要研究議題以功率配置與位元配置為主;在OFDMA 系統下加入子載波配置機制配合,以達到高容量與高頻譜效率之目標。此計畫也將進行多天線系統下之配置演算法設計。在第一年的研究內容中,我們首先致力於單天線傳輸模式之OFDM系統之功率與位元配置演算法研究,我們將考慮在多細胞而具有頻率複用造成互相干擾環境下,進行單天線適應性傳輸與配置演算法研究。我們將利用Lagrange方法推導出近似最佳化之配置模式。另一方面,以多天線傳輸模式而言,我們將延申先前單天線傳輸模式下之配置研究成果,在頻率複用造成之干擾通道下,設計多天線系統使用波束合成模式之資源配置演算法。在第二年的研究內容中,我們將研究OFDMA系統之資源配置研究,除功率與位元配置機置外,輔以動態子載波配置。我們將利用第一年成果調整使用於OFDMA系統上,發展出近似最佳化之演算法以解決最佳化所需高複雜度之問題。另一方面,在多天線MIMO 傳輸模式與配置演算法設計中,引人矚目為利用SVD於MIMO系統中。已有論文針對OFDMA 配合SVD MIMO進行配置演算法設計,然此法仍有不少缺失。我們將使用較佳之波束合成技術來做接收,並發展對應之子載波、功率及位元配置演算法,期使比現存方法能提供更佳效能或更低之運算複雜度。 In this project, we deal with the radio resource allocation algorithm designs for OFDM and OFDMA cellular systems under the system constraints and user requirement. We focus on the power and bit allocation for OFDM-based systems. The subcarrier allocation scheme for OFDMA-based systems is considered in addition. The goal of the project aims to achieve high capacity and high spectral efficiency. Besides, we also consider the algorithm design with the employment of multiple antennas. In the first year of the project, we first focus on the power and bit allocation for single antenna OFDM systems. The multi-cell operational environments are considered with the frequency reuse where the mutual interference is created. The Lagrange method is utilized to develop a suboptimal scheme. On the other hand, for the multiple antenna systems, we extend the research result to develop the allocation algorithm for the deployment of multiple antennas. In the second year of the project, we focus on the study of OFDMA radio resource allocation schemes. In addition to the power and bit allocation, we also consider the subcarrier allocation jointly. We are going to modify the scheme derived in the first year for OFDMA-based systems in order to develop a near optimal scheme, which would resolve the high computational complexity problem involved in the optimal solution. On the other hand, SVD-MIMO is a promising technique for MIMO systems. There exists a paper dealing the resource allocation problem for a SVD-MIMO OFDMA system. However, there are some problems in the proposed scheme. We are going to consider employing better beamforming scheme in the receiver and develop the associated subcarrier, power, and bit allocation algorithms. It would be expected to offer better performance or reduce computational complexity. 研究期間:9608 ~ 9707
    Relation: 財團法人國家實驗研究院科技政策研究與資訊中心
    Appears in Collections:[通訊工程學系] 研究計畫

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