一种用于多载波水声通信系统的频域均衡算法

自适应均衡器是水声通信克服信道多径衰退、消除码间干扰(ISI)的主要手段。为了在不减少数据传输速率的情况下,有效提高系统的抗多径能力,提出了一种用于水声多载波通信系统的多通道频域自适应均衡算法。利用频域LMS算法,按照最小化频域均方误差的准则调节均衡器,从而获得最优的频域权系数。该算法一方面解决了在频域求得估计误差的问题,另一方面,和采用信道编码的方式相比,在不降低数据传输速率的情况下,有效提高了系统的性能,通过仿真试验和湖试对其性能进行了验证。

Frequency-domain equalization for multi-carrier underwater acoustic communication

Acoustic correlation log (ACL) is potentially a suitable speed log for use in deep oceans. Correlation of seafloor reverberation signals between different hydrophones in a receiving array is used for velocity measurement. Correlation is determined by the position difference between hydrophones and the delay in reception between two successive sweeps. The sonar equations and the Kirchhoff approximate scattering model are used. Seafloor reverberation simulation based on the network model is presented. Based on the field investigation and research findings reported in the literature, a case of planar array is analyzed from 1D to 3D velocity. Sufficient conditions are obtained for keeping the normalized space-time correlation function of reverberation close to 1. Simulation shows feasibility of this method.