【作者】 朱昂昂； 高翔；

【Author】 ZHU Ang-ang;GAO Xiang;Southeast University;

【机构】 东南大学信息科学与工程学院；

【摘要】 分组扩频OFDM是远程水声通信中一种新的传输方案,为抑制分组扩频OFDM通信时水声中存在的线性调频信号,在假设信号与线性调频信号同步发出的前提下,本文提出了一种线性调频信号的估计和抑制方法。首先采用一种新颖的修正离散Chirp-Fourier变换对分组扩频OFDM中线性调频信号的中心频率和调频率进行估计,其次通过对信号时频分布图的处理估计出线性调频信号的持续时间,由此估计出线性调频信号从而将其抑制。仿真验证了本文方法的正确性。更多还原

【Abstract】 Grouping Spreading OFDM is a new transmission scheme in underwater acoustic communication.To suppress the LFM which insist in underwater environment in this system,a method was proposed in the premise that the interference signal(LFM) was emitted the same time with signal.Firstly,A New method of Discrete Chirp-Fourier Transform was used to estimate the center frequency and frequency modulation rate of LFM.Secondly,duration of LFM could be estimated by analysis on Time-frequency distribution.Simulation verify the correctness of this method.更多还原