| 多用户OFDM系统子载波比特分配算法 |
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| 引用本文： | 杨睿哲,袁超伟,丁义,杨奎.多用户OFDM系统子载波比特分配算法[J].北京邮电大学学报,2008,31(4):112-116. |
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| 作者姓名： | 杨睿哲 袁超伟 丁义 杨奎 |
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| 作者单位： | 北京邮电大学通信网络综合技术研究所,北京,100876;德州学院计算机科学与技术系,德州,253023;中国网通北京分公司,北京,100032 |
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| 摘 要： | 针对多用户正交频分复用技术（OFDM）系统功率优化问题，提出一种高效的子载波、比特分配算法。该算法基于最小化-最大者(Min-Max)的原则逐个分配子载波使用户功率递减，采用注水原理分配比特使用户功率最小化，最后使用贪婪算法将分配比特取整，以实现系统功率最小化的目标。理论分析和仿真结果表明，提出的算法有效降低系统发射功率，同时降低了运算的复杂度。
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| 关 键 词： | 多用户正交频分复用 子载波、比特分配 最小化-最大者 |
| 收稿时间： | 2007-12-13 |
Subcarrier-Bit Allocation Algorithm in Multiuser OFDM System |
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| YANG Rui-zhe,YUAN Chao-wei,DING Yi,YANG Kui.Subcarrier-Bit Allocation Algorithm in Multiuser OFDM System[J].Journal of Beijing University of Posts and Telecommunications,2008,31(4):112-116. |
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| Authors: | YANG Rui-zhe YUAN Chao-wei DING Yi YANG Kui |
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| Affiliation: | 1. Institute of Communication Network Integrated Technology, Beijing University of Posts and Telecommunications, Beijing 100876，China; 2. Department of Computer Science and Technology, Dezhou University, Dezhou 253023，China; 3. Beijing Branch, China Netcom, Beijing 100032，China |
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| Abstract: | A scheme of subcarrier-bit allocation is proposed for the power optimization in multiuser orthogonal frequency division multiplexing（OFDM） system. The scheme allocates the subcarriers to reduce the power of users with the principle of Min-Max, allocates the bit by water-filling to minimize the power of users. Finally the bit is rounded by greedy algorithm to obtain the minimized total transmit power of the system. Theoretical analysis and simulation results show that the performance is improved but with low complexity. |
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| Keywords: | multiuser orthogonal frequency division multiplexing subcarrier-bit allocation min-max |
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