关键词: 正交频分复用, 信道估计, 离散傅里叶变换, 判决门限, 误码率

Abstract: 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.

Key words: Orthogonal Frequency Division Multiplexing(OFDM) , channel estimation , Discrete Fourier Transform(DFT) , decision threshold , Bit Error Ratio(BER)