| 信道反馈延迟时MIMO中继系统的线性预编码算法 |
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| 引用本文： | 苏君煦,陈小敏,朱益民,朱秋明.信道反馈延迟时MIMO中继系统的线性预编码算法[J].电波科学学报,2016,31(3):462-467. |
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| 作者姓名： | 苏君煦 陈小敏 朱益民 朱秋明 |
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| 作者单位： | 1.南京航空航天大学电子信息工程学院, 南京 210016 |
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| 基金项目： | 中央高校基本科研业务费专项资金(NS2016044 |
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| 摘 要： | 针对采用放大转发(Amplify and Forward, AF)中继技术的多入多出(Multiple Input Multiple Output, MIMO)系统, 考虑信道估计误差及反馈存在延迟的情况, 提出一种基于最小均方误差(Minimum Mean Squared Error, MMSE)准则的预编码设计方案.假设基站-中继端及中继端-终端的信道均存在估计误差与反馈延迟, 在基站和中继端功率都受限条件下, 以MMSE为准则, 推导得到了基站预编码矩阵、中继转发矩阵和终端解码矩阵的闭式解.数值仿真结果表明, 该方案所提出的预编码算法能有效地改善系统的误比特率与均方误差.
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| 关 键 词： | MIMO中继 反馈延迟 预编码 误比特率 均方误差 |
| 收稿时间： | 2015-07-17 |
Linear precoding scheme for MIMO relay system with channel feedback delay |
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| Affiliation: | 1.College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China2.Jiangsu Key Laboratory of Internet of Things and Control Technologies, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | A linear pre-coding scheme is proposed for the amplify-and-forward(AF) multiple-input multiple-output (MIMO) relay system with channel estimation errors and feedback delay based on the minimum mean squared error (MMSE) criterion. In the proposed scheme, the channel feedback delay and the channel estimation errors are considered in the source-relay link and the relay-destination link, then the closed form of the optimal source precoding matrix, the relay precoding matrix and the decoder matrix are deduced with the maximum power constraint at the source station and the relay station based on the MMSE criterion. Numerical simulation results show that the proposed pre-coding scheme can effectively improve the performance of bit error rate (BER) and mean square error (MSE). |
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| Keywords: | MIMO relay feedback delay precoding BER MSE |
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