对于频率为fs的正弦序列,它的频谱应该只是在fs处有离散谱。但是,在利用DFT求它的频谱做了截短,结果使信号的频谱不只是在fs处有离散谱,而是在以fs为中心的频带范围内都有谱线出现,它们可以理解为是从fs频率上“泄露”出去的,这种现象称 为频谱“泄露”。
...频谱泄露;负频率[gap=1274]Key words: phase difference; discrete time Fourier transform; cosine window; spectral leakage; negative frequency...
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Based on analysis of channel estimation algorithm using traditional DFT transform domain, new channel estimation is proposed based on windowed DCT-IV transform Windowed. Sinusoidal is used to inhibit spectrum leakage of channel impulse response.
论文离散傅立叶变换(DFT)的信道估计算法的基础上,提出一种基于导频的加窗型第四类离散余弦变换(DCT-Ⅳ)的信道估计算法,该算法使用正弦加窗抑制信道冲激响应的频谱泄露。
参考来源 - 基于导频的OFDM系统的信道估计算法研究·2,447,543篇论文数据,部分数据来源于NoteExpress
在运用FFT分析谐波和间谐波时,FFT算法存在频谱泄露的现象。
When we use FFT to analysis harmonics and interharmonics, the interharmonics component will result in a phenomenon of frequency spectrum leakage.
与FFT和幅值检测法相比,该方法能消除fft算法的频谱泄露,提高了谐波检测的精度,且适用于含有非整数次谐波的信号。
Comparing with the FFT and the amplitude measure arithmetic, the novel method can avoid the spectrum leakage and fence effect in ideal extent and improve the precision of harmonics measurement.
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