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叠加导频信道估计方法是将导频与信息数据直接叠加,不占用专门的频谱和时隙,估计算法灵活多样,能解决导频信道估计系统中频谱利用率低和盲估计中不能实时估计的问题。介绍了叠加导频的MIMO-OFDM系统,采用正交多相序列作为叠加导频,利用导频符号的自相关及导频和接收信号的互相关,提出了一种选择性叠加导频信道估计信道的算法。最后,通过理论分析和计算机仿真,表明该方法在快衰落环境中有良好的性能。
The superposition pilot channel estimation method directly superposes the pilot and information data without occupying special frequency spectrum and time slot. The estimation algorithm is flexible and diverse and can solve the problem of low spectrum utilization rate in the pilot channel estimation system and the failure of real-time estimation in the blind estimation problem. The MIMO-OFDM system with superposition of pilots is introduced. Orthogonal polyphase sequences are used as superposition pilot. Based on the autocorrelation of pilot symbols and the cross-correlation between pilot and received signals, a selective superimposed pilot channel estimation Channel algorithm. Finally, theoretical analysis and computer simulation show that this method has good performance in fast fading environment.