正交分頻多工存取系統下的資源分配之研究

A Study on Resource Allocation in OFDMA Systems

黃亮穎(Liang-Ying Huang)

指導教授 ： 張進福

國立暨南國際大學/科技學院/通訊工程研究所/碩士(2009年)

摘要

在OFDMA系統下的資源分配中，子通道與功率根據通道的條件進行分配，達到最大資料率，因此如何有效的資源分配達到系統最大總和容量且公平性的分配在使用者之間是本論文主要的目的。本論文主要著重於OFDMA系統的子通道與功率分配之研究，從改良式次佳化子通道分配演算法( Suboptimal Subcarrier Allocation )與低複雜度的疊代功率分配演算法( Iterative Power Allocation，IPA )兩種分配方法，目的是提升系統總和容量與降低最佳化功率分配計算複雜度且達到差不多的效能。最後，更提出一種新的公平性指標演算法( Fairness Index Algorithm，FIA )利用放寬使用者之間的公平性指標臨界值，可以有效的提升系統總和容量。最後由模擬結果顯示本論文提出的方法比文獻[11]更可有效提升系統總和容量與降低複雜度。

關鍵字

正交分頻多工存取 ； 次佳化子通道 ； 低複雜功率分配 ； 公平性指標

並列摘要

In OFDMA resource allocation, to achieve the maximum data rate, subchannel and the responding transmitted power are allocated according to the channel condition. Therefore, how to design a resource allocation algorithm that helps the OFDMA system to achieve the higher sum capacity and fairness among the users becomes the main purpose of this thesis. In this thesis, OFDMA subchannel and power allocation are discussed and proposes two methods modified suboptimal subcarrier allocation algorithm and low complexity iterative power allocation (IPA) algorithm which have been proved to achieve the same performance. Finally, we also propose a fairness index algorithm, using releases fairness deviation among users to achieve the high sum capacity. Simulation results show that the proposed algorithms achieve higher sum capacity than [11] with lower complexity.

並列關鍵字

OFDMA ； Suboptimal Subcarrier ； Low complexity Power ； Fairness Index

參考文獻

[1] H. Sampath, S. Talwar, J. Tellado, V. Erceg and

A. Paulraj, “A fourth-generation MIMO-OFDM

broadband wireless system: design, performance and

field trial results ,” IEEE Communications

Magazine, vol. 40, no. 9, pp. 143–149, Sep.