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提出了一种正交频分复用 (orthogonal frequencydivision multiplexing,OFDM)系统中的抗噪声信道估计算法 ,适用于块状、梳状、格形和菱形导频模式。该算法通过导频位置偏移量预校正、二维离散 Fourier变换 (DFT)和变换域滤波消除噪声的影响 ,利用变换域补零和二维反离散Fourier变换进行信道传输函数插值 ,并使用变形 cos窗抑制插值过程中的频谱扩散。仿真结果表明 :该算法的系统性能明显优于传统信道估计算法 ,采用该算法获得了约 2 d B的每 bit信噪比增益。该算法在宽带 OFDM系统中有应用潜力
An anti-noise channel estimation algorithm in orthogonal frequency division multiplexing (OFDM) system is proposed, which is suitable for block, comb, lattice and rhombic pilot patterns. The algorithm uses the pre-correction of pilot position offset, the two-dimensional discrete Fourier transform (DFT) and the transform domain filter to eliminate the influence of noise, and uses the transform domain zero-padding and two-dimensional inverse discrete Fourier transform for channel transfer function interpolation, The cos window suppresses spectral spread during interpolation. The simulation results show that the performance of this algorithm is obviously better than that of the traditional channel estimation algorithm, and the gain of every bit SNR of about 2 d B is obtained by this algorithm. The algorithm has potential applications in wideband OFDM systems