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研究了正交频分复用(OFDM,orthogonal frequency division multiplexing)系统中基于变换域补零的插值方法,深入分析了基于离散余弦变换(DCT)的插值法,利用DCT的能量压缩特性,能有效消除传统基于离散傅里叶变换(DFT,Discrete Fourier Transform)估计算法在信道延时不是采样周期整数倍时产生的频谱能量泄露的问题。针对如何降低导频信道响应估计值中的噪声分量,提出了一种改进的方法,设计了一种适用于DCT变换域的滤波器,通过仿真系统参数变化对改进算法性能的影响,分析和验证了改进算法的有效性。
The interpolation method based on transform domain zero compensation in orthogonal frequency division multiplexing (OFDM) system is studied. The interpolation method based on discrete cosine transform (DCT) is deeply analyzed, and the energy compression characteristic of DCT is effective The traditional problem of spectral energy leakage generated when the channel delay is not an integral multiple of the sampling period is eliminated based on the traditional discrete Fourier transform (DFT) estimation algorithm. Aiming at how to reduce the noise component of pilot channel response estimation, an improved method is proposed. A filter suitable for DCT domain is designed. By analyzing the influence of system parameter changes on the performance of the improved algorithm, the analysis and verification To improve the effectiveness of the algorithm.