idft meaning in English
经反傅立叶变化
离散反傅里叶变换
Examples
- To overcome the affection of ici and awgn on the ls estimate of the transfer function at pilot tones , the proposed bispectrum - based channel estimation algorithm employ the suppression of ici and awgn components in the received pilot signals by bispectrum and then the accuracy of the estimation is improved . with the channel estimation at pilot tones , an efficient interpolation is necessary . an improved interpolation method based on transform - domain filtering is proposed , which employs dft / idft and filtering in a transform domain so that the effect of noise on the equalization is significantly reduced
针对导频处信道传递函数的ls估计中存在载波间干扰和加性高斯白噪声的影响的这一问题，本文将传统的ls估计方法与双谱相结合提出了一种新型的基于导频双谱信道估计算法，它利用了双谱对高斯噪声的抑制作用来减小接收到的导频信号中的载波间干扰和加性高斯白噪声的影响，从而提高了导频子载波上信道估计的精度。 - Due to the multi - carrier transmission technology used in mc - cdma systems , almost all the previous synchronization algorithms in mc - cdma systems are derives from that in ofdm systems . they are suitable for ofdm systems , but they are not optimal for mc - cdma systems . the data symbols transmitted in mc - cdma systems have form of cdma signal , which is greatly different from normal binary signal
传统的各种mc - cdma同步算法主要还是借鉴了ofdm的同步算法，本文提出采用用户扩频码作idft后在fft之前作同步，充分利用了ofdm信号中所包含的mc - cdma信号形式，它与纯粹的ofdm传输的二进制数据不同，它与pn序列具有更好的相关性。 - As an implementing method of multi - carrier modulation ( mcm ) , discrete multi - tone ( dmt ) modulation uses inverse discrete fourier transform ( idft ) vector as its modulating vector , and discrete " fourier transibrm ( dft ) vector as its demodulating vector , and the process of modulating and demodulating can be realized by using their fast calculating method
作为多载波调制的一种实现形式，离散多音频( dmt )调制分别采用逆傅立叶变换矢量和傅立叶变换矢量作为调制矢量和解调矢量，从而调制和解调过程可以利用这两种变换的快速算法实现。