一种改进的MIMO OFDM系统导频设计方案
doi: 10.3724/SP.J.1146.2007.01995
An Improved Approach of Pilot Design for MIMO OFDM Systems
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摘要: 对于采用虚拟子载波的多输入多输出(MIMO)正交频分复用(OFDM)系统，传统最优的均匀分布导频序列在某些情况下是不可用的。为了获得此时的最优导频序列，该文基于最小化最小二乘(LS)信道估计均方误差(MSE)的准则提出了一种改进的导频设计方案。该方案能够快速有效地找到最优导频序列，或在最优导频序列不存在的情况下给出次优的导频序列。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
Abstract: For Multi-Input Multi-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems with virtual subcarriers, conventional equispaced pilot tones are no longer applicable in some situations. To obtain the optimal pilot sequence in such cases, this paper proposes an improved pilot-design approach based on the criterion of minimum Mean-Square-Error (MSE) of the Least Squares (LS) channel estimate. The proposed approach can quickly and efficiently find the optimal pilot sequence, or suboptimal pilot sequences when the optimal ones do not exist. The simulation results demonstrate the effectiveness of the proposed approach. -
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