针对认知无线电系统中正交频分复用( OFDM )信号参数估计这一重要问题, 利用OFDM 信号的循环谱实现了符号周期的盲估计。-For cognitive radio systems, orthogonal frequency division multiplexing (OFDM) signal parameter estimation of this important issue, the cyclic spectrum of the OFDM signal to achieve the

多普勒功率谱在多普勒频域估计方法起到关键性作用。结合实际铁路场景,分析了各个场景信道特征和场景对应的多普勒功率谱。 -Doppler power spectrum in doppler frequency domain estimation methods play a key role.In this paper, the actual railway scenes, each channel characteristics and scene corresponding doppler

分析了该信号的时域、频域、倒谱，循环谱等,包括广义互相关函数GCC时延估计，这个有中文注释，看得明白。( Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc. Including the generalized cross-correlation function GCC time delay estimation, The Chinese have a comment, und