| 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].桂林电子科技大学学报,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;桂林航天工业高等专科学校,电子工程系,广西,桂林,541004
2. 天津大学,电子信息工程学院,天津,300017 |
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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 |
| 修稿时间： | 2005年11月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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| 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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| Keywords: | multi-user Orthogonal Frequency Division Multiplexing(OFDM) self-adaptive combined modulation bit allocation |
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