基于DFT判决门限的OFDM信道估计算法

摘要

在正交频分复用系统中,为了提高信道估计算法的准确度和降低复杂度,首先对传统的离散傅里叶变换(DFT)信道估计算法进行了改进,通过引入判决门限,进一步消除信道噪声的影响,提高系统性能；然后与LS估计、SVD估计和DFT估计进行对比分析；最后通过Matlab软件进行仿真分析,结果表明了改进算法在基本不增加复杂度的前提下,提高了信道估计的准确度,进而提高整个系统的性能.%In Orthogonal Frequency Division Multiplexing (OFDM) systems, the key point is to improve accuracy and reduce complexity of channel estimation algorithm. First, the traditional Discrete Fourier Transform (DFT) channel estimation algorithm was improved. Furthermore, the impact of channel noise was eliminated through the introduction of the decision threshold, and system performance improved, then the improved channel estimation was compared with LS, SVD and DFT estimation. Finally, the Matlab simulation results show that the proposed algorithm can improve the accuracy of channel estimation without increasing the complexity, and then improve the performance of the whole system.Orthogonal Frequency Division Multiplexing (OFDM); Peak-to-Average Power Ratio (PAPR); Partial Transmit Sequence (PTS); m-sequence; pilot