| 多载波系统中低复杂度的改进比特和功率分配算法 |
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| 引用本文： | 许威,赵春明.多载波系统中低复杂度的改进比特和功率分配算法[J].东南大学学报,2007,23(1):12-15. |
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| 作者姓名： | 许威 赵春明 |
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| 作者单位： | 东南大学移动通信国家重点实验室 南京210096 |
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| 基金项目： | The National High Technology Research and Development Program of China （863 Program） （No. 2006AA01 Z263）, the National Natural Science Foundation of China （ No. 60496311 ）. |
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| 摘 要： | 基于迭代的比特和功率分配机制,提出了一种低复杂度的比特和功率分配算法.与传统的迭代分配算法不同,该算法在每次迭代中只需要比较几个特定的子载波.该方法在保持传统迭代算法性能的前提下极大地减小了迭代分配算法的复杂度.此外,通过选择等功率分配方案作为初始方案加快了算法的收敛速度,进一步降低了算法复杂度.仿真结果表明,提出的改进算法在基本不牺牲系统性能的前提下有效地降低了算法复杂度.
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| 关 键 词： | 多载波调制 分配算法 比特分配 算法复杂度 |
| 文章编号： | 24268009 |
| 修稿时间： | 09 20 2006 12:00AM |
Improved reduced-complexity bit and power allocation algorithms for multicarrier systems |
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| Xu Wei,Zhao Chunming.Improved reduced-complexity bit and power allocation algorithms for multicarrier systems[J].Journal of Southeast University(English Edition),2007,23(1):12-15. |
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| Authors: | Xu Wei Zhao Chunming |
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| Institution: | National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China |
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| Abstract: | Based on the iterative bit-filling procedure,a computationally efficient bit and power allocation algorithm is presented.The algorithm improves the conventional bit-filling algorithms by maintaining only a subset of subcarriers for computation in each iteration,which reduces the complexity without any performance degradation.Moreover,a modified algorithm with even lower complexity is developed,and equal power allocation is introduced as an initial allocation to accelerate its convergence.Simulation results show that the modified algorithm achieves a considerable complexity reduction while causing only a minor drop in performance. |
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| Keywords: | multicarrier modulation allocation algorithm bit loading computational complexity |
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