【摘要】 水声信道是最为复杂的数据通信环境之一,而具有重要军用和商用价值的浅海水声信道,其多径与频散效应更为严重。在浅海水声数字通信中,普遍存在着码间干扰和码内干扰效应,严重影响了水下通信的速度和质量。在判决反馈结构的基础上,采用分数的方法,提出了一种适用于浅海水声信道的自适应均衡算法,并通过计算机仿真实验与整数方法进行了性能对比。传输信号采用正交相移键控调制方式,以有效利用有限通信带宽。仿真结果表明,该算法获得了较快的收敛速度和较小的稳态误差,提高了水声通信的有效性及可靠性,因而具有良好的工程应用价值。更多还原

【Abstract】 An underwater acoustic channel is a complicated medium for data communications,especially in shallow coastal regions,which is important in military and commercial applications.Signals sent through a shallow water channel are often corrupted by inter-symbol interference(ISI) and intra-symbol interference,seriously affecting the underwater acoustic communication quality.We propose an adaptive equalization algorithm based on the decision feedback structure,and using a fractional sampling method.The performance is compared with the baud-spaced adaptive equaliz-ation in computer simulations.Quadrature phase shift keying(QPSK) signaling is employed to make efficient use of the available bandwidth.Mont Carlo simulations are performed,showing that the proposed algorithm with high convergence rate and low steady state error results in improved communication effectiveness and reliability.更多还原