【摘要】 为了解决快衰落条件下多输入多输出(MIMO)正交频分复用(OFDM)系统的信道估计问题,根据MIMOOFDM的时变信号模型,提出了一种基于内插和导频辅助的快衰弱信道估计方法,讨论了进行有效信道估计的必要条件,得到了对导频矩阵的要求.本算法不约束信道为静态或准静态,能够有效地估计出在一个OFDM符号持续时间中发生变化的信道参数,并且具有良好的均方误差性能.计算机仿真表明了这一信道估计方法的有效性.更多还原

【Abstract】 An interpolation and pilot based scheme was proposed for channel estimation over fast fading channels for multiple-input-multiple-output(MIMO) orthogonal frequency division multiplexing(OFDM).Interpolation was introduced to decrease the number of time-varying channel parameters need to estimate.Then the interpolation result was applied to MIMO OFDM and the least square estimation expression was derived.The estimation reliability and the pilot matrix design were discussed.The method is not restricted to static or quasi-static channels,and can estimate the channel parameters varying in one OFDM symbol and achieve low mean square error.Simulation showed the effectiveness of the proposed method.更多还原