| 多用户OFDM自适应组合调制及比特分配算法的实现 |
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| 引用本文： | 李精华,侯春萍,孙山林.多用户OFDM自适应组合调制及比特分配算法的实现[J].桂林电子工业学院学报,2006,26(1):20-23. |
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| 作者姓名： | 李精华 侯春萍 孙山林 |
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| 作者单位： | [1]天津大学电子信息工程学院,天津300017 [2]桂林航天工业高等专科学校电子工程系,广西桂林541004 |
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| 基金项目： | 国家自然科学基金项目（60172068） |
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| 摘 要： | 将自适应技术应用于多用户正交频分复用系统，能够提高频谱利用率，降低系统发射功率，从而使系统的整体性能达到最优；针对多用户OFDM系统，将其信道分配和比特分配相结合，提出了更优的多用户OFDM自适应组合调制比特分配算法（MCABA）。根据信道特性的瞬时估计值，自适应地为各用户分配子信道和比特，在给定误码率的条件下使总的发送功率最小，仿真结果表明，该算法计算简单，优化效率高，可以达到接近理论上的最优水平。
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| 关 键 词： | 多用户 正交频分复用 自适应组合调制 比特分配 |
| 文章编号： | 1001-7437（2006）01-0020-04 |
| 收稿时间： | 2005-11-15 |
Algorithm Implementation of Self-Adaptive Combined Modulation and Bit Allocation in Multi-user OFDM System |
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| LI Jing-hua, HOU Chun-ping, SUN Shan-lin.Algorithm Implementation of Self-Adaptive Combined Modulation and Bit Allocation in Multi-user OFDM System[J].Journal of Guilin Institute of Electronic Technology,2006,26(1):20-23. |
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| Authors: | LI Jing-hua HOU Chun-ping SUN Shan-lin |
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| Affiliation: | 1. School of Electronic Information and Engineering, Tianjin University, Tianjin 300017, China; 2. Dept. of Electronic Engineering, Guilin College of Aerospace Technology, Guilin 541004,China |
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| Abstract: | The application of adaptive technology to the multi-user OFDM system can increase the spectrum usage, reduce the transmission power of the system and optimize the system performance. In this paper we propose a novel multi-user combined-modulation algorithm of adaptive OFDM, which combines the wireless channel and bit allocations. According to the estimation of instantaneous channel characteristics, the adaptive allocation algorithm can assign the sub-channels and bits for each user in the system to minimize the total transmission power with a given bit error rate. Simulated results show that the proposed algorithm is as simple in calculation, high in efficiency and optimal in theory as the optimal scheme. |
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