| 一种改进的OFDM自适应功率分配算法 |
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| 引用本文： | 郑培超,宋瀚涛,徐晓梅. 一种改进的OFDM自适应功率分配算法[J]. 计算机工程, 2008, 34(1): 37-39 |
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| 作者姓名： | 郑培超 宋瀚涛 徐晓梅 |
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| 作者单位： | 北京理工大学计算机科学技术学院,北京,100081 |
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| 摘 要： | 注水分配算法是实现正交频分复用(OFDM)系统中功率和误比特率受限条件下总比特速率最大化的最优算法，在估计目标值时，常使用基于拉格朗日乘子法的二分算法。针对迭代过程中估计值偏离目标值时收敛较慢的情况，提出混合二分算法。仿真结果证明，该算法比二分算法具有更快的收敛速度。
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| 关 键 词： | 正交频分复用 注水分配 自适应调制 功率分配 |
| 文章编号： | 1000-3428（2008）01-0037-03 |
| 收稿时间： | 2007-01-17 |
| 修稿时间： | 2007-01-17 |
Improved Power Allocation Algorithm for OFDM Systems |
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| ZHENG Pei-chao,SONG Han-tao,XU Xiao-mei. Improved Power Allocation Algorithm for OFDM Systems[J]. Computer Engineering, 2008, 34(1): 37-39 |
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| Authors: | ZHENG Pei-chao SONG Han-tao XU Xiao-mei |
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| Affiliation: | (School of Computer Science and Technology, Beijing Institute of Technology, Beijing 100081) |
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| Abstract: | Water-filling distribution algorithm is the optimal algorithm for OFDM systems to maximize the overall bit rate under overall power and bit error rate constraints. Dichotomy combined Lagrange-multiplier method is used to estimate the tar aet value. The algorithm has slow convergence when the estimated value is far from the target. This paper presents a mixed dichotomy to solve the problem. Simulation resuhs show that the proposed algorithm has faster convergence than dichotomy. |
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| Keywords: | OFDM water-filling distribution adaptive modulation power allocation |
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