【摘要】 在水声通信中,发射与接收端相对运动引起的多普勒频移会严重恶化OFDM系统传输效果。因此多普勒频移估计是水声通信的关键技术之一。本文采用的最大Dopp ler频移估计算法,是利用信道功率谱的分布对接收的导频信号进行频域差分检测来进行估计。这种方法复杂度低,精度较高,无需获得正确的信道时域冲击响应信息,也无需再对信号进行自相关运算,而且特别适用于低信噪比的水声通信系统。更多还原

【Abstract】 In underwater acoustic communication,the relactively movement of transmitter and receiver brings severely deteriorated.So Doppler estimation is the one of the key technique in underwater communication.In this paper,the maximal Doppler estimation is to analyze received pilot signal in frequency domain by the distribution of channel’s power spectum,which is suitable for underwater communication system that is in low SNR.更多还原