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標題: | 正交分頻多工資源分配之遞迴式演算法 Iterative Resource Allocation Algorithms for OFDM |
作者: | Yu-Ruei Lin 林鈺睿 |
指導教授: | 葉丙成 |
關鍵字: | 多頻正交分工,失效機率,功率非配,位元分配,傳輸率, OFDM,outage probability,power allocation,bit allocation,Throughput, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 在本論文當中,我們考慮多頻正交分工系統在瑞雷衰減環境中的無線資源分配。由於多頻正交系統的頻率偏移之故,各子載波並非完全正交。因此子載波間會互相干擾。本論文首先推導出子載波在頻率偏移與瑞雷衰減效應下的訊擾比及失效機率,進而得到多頻正交分工系統的整體傳輸率。本論文考慮三種提升系統整體傳輸率之無線資源分配問題:傳輸功率分配、傳輸位元分配、傳輸功率暨位元分配。在功率分配問題上,我們採用幾何規劃的技巧以得到最佳化傳輸功率分配。在另一方面針對傳輸位元分配及傳輸功率暨位元分配的問題,我們則是提出了遞迴式以得到此類資源分配問題的近最佳化解。 In this thesis, we consider the resource allocation for OFDM system with frequency offset under Rayleigh fading. The signal-to-interference ratio (SIR) and the resulting outage probability of each carrier is derived for the OFDM system. With the outage probability expression, the overall throughput of the OFDM system is obtained as well. Three different resource allocation problem: power allocation, bit allocation, and joint power-bit allocation, are explored to maximize the overall throughput for the OFDM system. For power allocation problem, the optimal power allocation is obtained by applying geometric programming technique. On the other hand, due to the difficulty of integer programming, iterative algorithms are proposed to find near optimal bit allocation and joint power-bit allocation for the OFDM system respectively. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24749 |
全文授權: | 未授權 |
顯示於系所單位: | 電信工程學研究所 |
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