MIMO NC-OFDM系统的半盲信道估计算法研究

Study of Semi-blind Channel Estimation in MIMO NC-OFDM Systems

提出了一种基于零空间的多输入多输出不连续正交频分复用(MIMO NC-OFDM)系统的半盲信道估计的新方法。该方法利用线性预测得到信道矩阵的零空间作为LS算法的盲约束,对MIMO NC-OFDM时域信道脉冲响应进行估计。通过大量仿真表明,与传统的最小二乘算法比较,该方法可以在使用较少导频的条件下获得很好的信道估计性能,从而可以提高系统频谱有效性。

A new method of MIMO NCOFDM semiblind channel estimation based on null space is proposed. Using the null space of channel matrix obtained by linear prediction as the blind constraint of LS algorithm, the scheme estimates the timedomain impulse response of MIMO NCOFDM channels. Simulations have shown that, compared to the traditional LS algorithm, the proposed method can achieve good channel estimation performance with fewer pilots and the system spectral efficiency can be enhanced thereby.