| 低复杂度的MIMO-OFDM系统自适应调制方案 |
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| 引用本文： | 王昕,滕建辅.低复杂度的MIMO-OFDM系统自适应调制方案[J].天津大学学报(自然科学与工程技术版),2005,38(10):909-912. |
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| 作者姓名： | 王昕 滕建辅 |
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| 作者单位： | 天津大学电子信息工程学院，天津大学电子信息工程学院 天津 300072，天津 300072 |
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| 基金项目： | 天津大学电子信息工程学院科研基金资助项目. |
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| 摘 要： | 以最小化发射总功率为目标,提出了一种低复杂度的MIMO-OFDM无线通信系统的自适应调制方案.在发射端,基于已知信道状态信息,应用奇异值分解将空分复用信道转化为并行的子信道,并将表征信道增益的信道矩阵特征值用于子信道自适应调制优化设计中.针对MQAM调制,采用变步长的贪婪算法得到优化的子信道比特加载及功率分配方案.仿真结果表明,所提出的简化算法与一种近似最优的自适应调制算法性能接近,但复杂度降低了30%以上.
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| 关 键 词： | 多收发天线 正交频分复用 自适应调制 无线通信 |
| 文章编号： | 0493-2137（2005）10-0909-04 |
| 收稿时间： | 2004-05-11 |
| 修稿时间： | 2004-11-19 |
Adaptive Modulation Scheme with Low Complexity for MIMO-OFDM Systems |
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| WANG Xin, TENG Jian-fu.Adaptive Modulation Scheme with Low Complexity for MIMO-OFDM Systems[J].Journal of Tianjin University(Science and Technology),2005,38(10):909-912. |
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| Authors: | WANG Xin TENG Jian-fu |
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| Institution: | School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | A low complexity adaptive modulation scheme was proposed in order to minimize the total transmission power of the transmitter in MIMO-OFDM wireless communication systems. At the transmitter end, singular value decomposition (SVD) method was utilized to transform the spatial multiplexing channel into parallel subchannels based on the known channel state information. The eigenvalues of channel matrix representing the subchannel gains were employed in the optimization design of sub-channel's adaptive modulation scheme. For MQAM modulation, the optimized bit loading and power allocation were derived from a various-step greedy algorithm. The simulation results show that ihe presented scheme has a performance close to the sub-optimal algorithm, saving computation complexity by 30% and more. |
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| Keywords: | multiple input multiple output orthogonal frequency division multiplexing adaptive modulation wireless communication |
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