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中文摘要：
基于双衰信道的频域响应,提出了一类双衰信道下多天线正交频分复用（MIMO-OFDM）系统的最优化频域导频设计方案. 推导了相应的模型,给出了基于导频的最大似然信道估计器的均方误差下界,并以此下界为标准,设计了多天线正交频分复用系统的最优导频. 仿真表明,基于设计最优导频的信道估计器可以在低复杂度下取得接近理论界的性能,但是复杂度增加.
英文摘要：
A class of optimum pilot in frequency domain for multi-input multi-output orthogonal frequency division multiplexing system （MIMO-OFDM） in doubly selective channels is designed based on the frequency domain response of the channel. The model of the MIMO-OFDM system in doubly-selective channels is derived and a lower bound of mean squared error （MSE） of the channel estimator using frequency domain pilot is presented. And by using this bound, the optimum pilot of MIMOOFDM system is designed, Simulations showed that the channel estimator based on the proposed pilot can approach the theoretical bound at a low computational complexity, but it become more complex.
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