| OFDM系统自适应比特加载算法 |
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| 引用本文： | 龚汉东,叶梧,冯穗力,柯峰.OFDM系统自适应比特加载算法[J].华南理工大学学报(自然科学版),2006,34(1):1-5. |
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| 作者姓名： | 龚汉东 叶梧 冯穗力 柯峰 |
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| 作者单位： | 华南理工大学,电子与信息学院,广东,广州,510640 |
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| 摘 要： | 在正交频分复用（OFDM）系统中应用自适应技术能有效地提高系统性能．文中针对固定数据速率及子信道比特率受限的情况，研究了使系统发射功率最小化的自适应比特加载问题．首先对无限小信息粒度的最优化问题进行分析，确定最小功率的下界．在此基础上再对整数比特（有限信息粒度）的最优化问题进行求解，由此得到了一种快速的整数比特加载算法．仿真结果证明，该算法是一种运算速度快的最优比特加载算法．
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| 关 键 词： | 正交频分复用 自适应算法 优化 比特加载 |
| 文章编号： | 1000-565X（2006）01-0001-05 |
| 收稿时间： | 2005-06-09 |
| 修稿时间： | 2005年6月9日 |
Adaptive Bit-Loading Algorithm in OFDM System |
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| Gong Han-dong,Ye Wu,Feng Sui-li,Ke Feng.Adaptive Bit-Loading Algorithm in OFDM System[J].Journal of South China University of Technology(Natural Science Edition),2006,34(1):1-5. |
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| Authors: | Gong Han-dong Ye Wu Feng Sui-li Ke Feng |
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| Institution: | College of Electronic and Information Engineering, South China Univ. of Tech. , Guangzhou 510640, Guangdong, China |
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| Abstract: | The application of adaptive technique to OFDM(Orthogond Freguency Division Multiplexing) systems can effectively improve the system performance.In this paper,an adaptive bit-loading algorithm to minimize the transmission power is investigated for the case of fixed data rate and restricted subcarrier bit rate.During the investigation,the optimization of infinitesimal information granularity is first solved to determine the low bound of the minimal power,and then the optimization of integer bit(finite information granularity) is solved,resulting in a fast integer bit-loading algorithm.Simulation results indicate that the proposed algorithm is an optimal bit-loading algorithm with high operating speed. |
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| Keywords: | Orthogond Freguency Division Multiplexing adaptive algorithm optimization bit loading |
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