改进的OFDM/OQAM预编码信道估计方法

摘要

To acquire a better performance,the channel state estimation at the receiver in orthogonal fre-quency division multiplexing(OFDM)with offset quadrature amplitude modulation(OQAM)system is an im-portant link.For the channel estimation of scattered pilot-based OFDM/OQAM systems,this paper analyzes the precoding channel estimation method,and points out the high computation complexity of this method.To solve this problem,this paper proposes an improved precoding channel estimation method,w hich reduces com-plexity by using two precoding matrices,reduces the code number of the data symbol and the dimension of the precoding matrix,and decreases the computation complexity efficiently.The simulation result shows that under the same channel state the proposed method can obtain a similar channel estimation accuracy with the precoding method,and reduce the computation complexity of the system at the same time.%基于偏移正交幅度调制(offset quadrature amplitude modulation,OQAM)的正交频分复用(orthogo-nal frequency division multiplexing,OFDM)系统为获得良好的系统性能,系统在接收端的信道估计是重要一环.针对离散导频OFDM/OQAM 系统的信道估计问题,分析了该系统典型的预编码方法,指出了其计算复杂度大的问题.在此基础上,提出了一种改进的预编码方法.该方法采用两个预编码矩阵,减少了每次编码的时频格点数目.该方法减小了预编码矩阵的维数,进而显著降低了系统信道估计的计算复杂度.仿真结果表明,在相同的信道条件下,该方法能够保证与预编码方法相近的信道估计精度,同时有效降低系统计算复杂度.