| 信道估计误差下多用户MIMO／OFDM下行系统自适应传输 |
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| 引用本文： | 韩锋,刘应状,朱光喜,卢小峰. 信道估计误差下多用户MIMO／OFDM下行系统自适应传输[J]. 计算机科学, 2007, 34(10): 52-55 |
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| 作者姓名： | 韩锋 刘应状 朱光喜 卢小峰 |
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| 作者单位： | 华中科技大学电信系,武汉,430074 |
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| 基金项目： | 国家自然科学基金 , 国家高技术研究发展计划(863计划) |
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| 摘 要： | 以系统总速率最大化为目标，提出在非理想信道信息情形下基于空分复用的多用户MIMO／OFDM下行系统的自适应资源分配方案，并满足用户的QoS要求。该方案首先根据用户信道估计误差模型和用户QoS对用户进行子载波分配，然后在各个子载波上进行功率和比特分配。仿真结果表明，该方案相对静态分配方案可获得更大的总速率，而且对信道估计错误更加强健，可应用到信道信息不确定的实际系统中。
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| 关 键 词： | 多天线多载波 信道估计误差 自适应资源分配 |
Adaptive Resource Allocation Scheme for Multiuser MIMO/OFDM Downlink with Channel Estimation Error |
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| HAN Feng,LIU Ying-Zhuang,ZHU Guang-Xi,LU Xiao-Feng. Adaptive Resource Allocation Scheme for Multiuser MIMO/OFDM Downlink with Channel Estimation Error[J]. Computer Science, 2007, 34(10): 52-55 |
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| Authors: | HAN Feng LIU Ying-Zhuang ZHU Guang-Xi LU Xiao-Feng |
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| Affiliation: | Department Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 |
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| Abstract: | In this paper,we propose an adaptive resource allocation scheme for spatial multiplexing based multi-user MIMO/OFDM downlink system under imperfect channel information to maximize the system sum-rate and satisfy user's QoS parameters.Specially,sub-carriers are first allocated according to user's channel estimation error model and QoS pa- rameters.Then power and bit allocation is carried out on each sub-carrier accordingly.Simulation results show that the proposed adaptive scheme could achieve more system sum-rate than the fixed scheme.And it is more robust to channel error and more practical in realistic wireless communication systems with channel uncertainties. |
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| Keywords: | MIMO/OFDM channel estimation error adaptive resource allocation |
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