水声通信变步长自适应多普勒补偿

针对水声通信中信号收发双方相对运动引起的多普勒效应，对于QPSK调制信号在自适应多普勒补偿的基础上提出一种变步长自适应多普勒补偿算法。该算法根据接收信号的均衡误差和相位估计，调节多普勒跟踪步长，估计出多普勒效应，通过线性插值法对接收信号进行多普勒补偿。通过计算机仿真，将其与恒定多普勒跟踪步长的自适应多普勒补偿方法进行了性能对比，结果显示该方法能够较好估计出多普勒效应，提高了接收性能。

Variable step-size adaptive Doppler compensation for acoustic communication

Aimed at the Doppler effect which is caused by relative move of the transmitter and the receiver in acoustic communication, a variable step-size adaptive Doppler compensation algorithm for QPSK modulation signals was proposed, which was based on the algorithm of adaptive Doppler compensation. Through the equalization error and phase estimation of the receiving signals, the algorithm can adjust Doppler tracking step-size, estimate Doppler effect and compensate Doppler effect with linear interpolation. The stimulation proved that the algorithm can estimate Doppler effect better than constant step-size adaptive Doppler compensation ones and improve the receiving performance.