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数据的高速传输以及终端的高速移动,导致无线通信信道具有时间选择性与频率选择性两个特征.对MIMO-OFDM系统中基于导频的时间-频率双选择性衰落信道的信道估计问题进行了研究.首先,利用复指数基扩展信道模型来表示一个OFDM符号周期内双选择性衰落信道的变化;然后基于该复指数基扩展信道模型,提出了一种有效的MIMO-OFDM双选择性衰落信道的估计方法;最后在该估计算法的基础上,基于信道估计均方误差最小准则,对导频及其参数进行了优化设计,主要包括导频的个数、导频的插入位置以及导频的表达形式等.实验结果表明本文的算法在时间-频率双选择性衰落信道下具有很好的性能,并与理论分析结果相吻合.
The high-speed data transmission and the high-speed mobile terminal make the wireless communication channel have the characteristics of time selectivity and frequency selectivity.The channel estimation of pilot-based time-frequency dual-selective fading channel in MIMO-OFDM system Research.Firstly, the exponential base extension channel model is used to represent the change of dual selective fading channel in one OFDM symbol period. Then based on the exponential base extension channel model, an effective MIMO-OFDM dual selective fading channel Finally, based on this estimation algorithm, the pilot and its parameters are optimized based on the minimum criterion of mean square error of channel estimation, including the number of pilots, the insertion position of pilots and the pilot Etc. The experimental results show that the proposed algorithm has good performance under the time-frequency dual-selective fading channel and is in good agreement with the theoretical analysis.