| 基于非均匀分布的MIMO OFDM系统最优导频序列设计 |
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| 引用本文： | 胡蝶, 何良华, 杨绿溪. 基于非均匀分布的MIMO OFDM系统最优导频序列设计[J]. 电子与信息学报, 2007, 29(3): 635-638. doi: 10.3724/SP.J.1146.2005.00685 |
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| 作者姓名： | 胡蝶 何良华 杨绿溪 |
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| 作者单位： | 东南大学无线电工程系,南京,210096;同济大学电子与信息工程学院,上海,200092 |
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| 摘 要： | 在OFDM系统中，为了避免发送端低通滤波器的影响，一些处在所分配带宽边缘的子载波是不用来进行数据传输的，这些子载波通常被称为虚拟子载波。由于虚拟子载波的存在，某些情况下传统最优的均匀分布导频序列是不可用的，该文基于使多输入多输出(MIMO)OFDM系统中最小二乘信道估计的均方误差达到最小的准则，推导了非均匀分布最优导频序列。可以证明，此时的最优导频序列必须通过求解一约束不等式组来得到。仿真结果显示了所提方法的有效性。
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| 关 键 词： | 信道估计 MIMO OFDM 导频序列 |
| 文章编号： | 1009-5896（2007）03-0635-04 |
| 收稿时间： | 2005-06-13 |
| 修稿时间： | 2006-01-03 |
Optimal Pilot Sequence Design Based on Nonuniform Placement for MIMO OFDM Systems |
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| Hu Die, He Liang-hua, Yang Lü-xi. Optimal Pilot Sequence Design Based on Nonuniform Placement for MIMO OFDM Systems[J]. Journal of Electronics & Information Technology, 2007, 29(3): 635-638. doi: 10.3724/SP.J.1146.2005.00685 |
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| Authors: | Hu Die He Liang-hua Yang Lü-xi |
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| Affiliation: | Department of Radio Engineering, Southeast University, Nanjing 210096, China;School of Electronics and Information Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | In Orthogonal Frequency Division Multiplexing (OFDM) systems, to avoid influence of the low-pass filter on the transmitter side, some subcarriers on both edges of the allocated bandwidth are not used for transmission. These subcarriers are usually called virtual subcarriers which cause approach of conventional uniformly placed pilot tones inapplicable in some situations. Therefore, in this letter, based on nonuniform pilot tone placement, the optimal pilot sequences are derived, which can achieve the minimum mean square error of the least squares estimate for Multiple-Input Multiple-Output (MIMO) OFDM systems. Simulation results demonstrate the effectiveness of the proposed approach. |
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| Keywords: | Channel estimation MIMO OFDM Pilot sequence |
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