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中文摘要：
提出了一种全新的多入多出正交频分复用（MIMO—OFDM）信道估计和导频设计方案．当信道近似不变的OFDM数目与发射天线数目相同时，从理论上推导出基于重叠导频和正交导频结构的统一频域信道估计解和时域信道估计解．该算法大大降低了最优导频信号存在的条件，且具有非常低的复杂度和灵活的天线配置，导频信号能简单地通过从空间维的恒幅度构造就可以达到系统的MIMO-OFDM的均方误差（MSE）最优性能．该算法在发射天线数目为2、3和4时具有相当大的实用价值．仿真结果证明了本文算法的正确性以及导频设计的合理性．
英文摘要：
A novel channel estimation and pilot structure are proposed for multi-input multi-output orthogonal frequency division multiplex （MIMO-OFDM） structure. When the number of OFDM symbols, whose channels keep invariant, equals the number of transmit antennas, the frequency and time domain channel estimation solutions based on superposition-pilot and orthogonal-pilot structure are deduced theoretically. The algorithm loosens greatly the condition for optimal pilot signals and has very low complexity and flexible antenna structure, where the design of pilot signals can be easily implemented to obtain the optimal mean square error （MSE） performance. The algorithm has a very big practical value when the number of transmit antennas is 2, 3 and 4. Simulation results verified the validity of channel estimation algorithm and pilot structure.
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