基于特殊训练序列的信道估计算法的研究

为降低MIMO—OFDM系统信道估计运算复杂度和提高估计精度，设计了一种特殊的训练序列，并给出了基于该训练序列的低复杂度算法，采用该方法避免了矩阵求逆运算，使运算大大简化，且在系统存在ISI时,采用本文给出的信道估计方法，信道的估计参数不会受到ISI的影响。仿真结果证明在存在ISI时，给出的信道估计与不存在ISI时性能相同，在高SNR时比传统方法其MSE高20dB。

Algorithm of channel estimation using special training sequence for MIMO-OFDM systems

This paper proposes two methods to improve the performance of the MIMO-OFDM systems in the presence of inter-symbol interference: special training sequence design and simplified channel estimation.The special training sequence has a desirable creast-factor both in time domain and frequency domain.By using this sequence no matrix inverse is required.The simulation results show that the proposed method outperforms the conventional method with respect to the mean square error of the estimated channel in the presence of ISI by more than 20 dB if the SNR is high.