一种改进的MIMO-OFDM系统Steiner估计算法

鉴于MIMO-OFDM（多输入多输出-正交频分复用）系统中时域信道方法的灵活性和低带宽开销的特点,本文采用Steiner训练符号设计方法设计MIMO-OFDM系统中的时域训练符号,给出传统CDMA系统的Steiner信道估计器在MIMO-OFDM系统中的实现过程,解决了MIMO-OFDM时域信道估计矩阵求逆的问题,降低了时域信道估计的实现复杂度。并进一步提出了采用接收天线DOA（波达方向）改进的Steiner信道估计方法,提高了信道估计的精度,获得了一定程度的性能增益,增强了时域信道估计方案的实际可行性。

An Improved Steiner Estimation Method for MIMO-OFDM System

As for the flexibility and low bandwidth overheads of time domain channel estimation schemes for MIMO-OFDM system,the training sequence for time domain channel estimation is designed according to the Steiner approach in multi-user CDMA uplink system. Thus,the Steiner channel estimation method can be utilized in MIMO-OFDM system to avoid the matrix inversion problem. Furthermore,the approach can reduce the computation complexity of the classical time approach. In this paper,we further propose one novel approach to improve the classical Steiner estimator＇s performance by the DOA（direction of arrival） of the receiving signal at all receiver antennas. Thus,the channel estimation accuracy of the improved Steiner estimator by DOA is comparable to that of frequency domain channel estimation schemes in MIMO-OFDM system,with low channel overheads.