A simulation tool for high data-rate acoustic communication in a shallow-water, time-varying channel
A simulation tool for high data-rate acoustic communication in a shallow-water, time-varying channel
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DOI：
10.1109/48.486789
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发表时间：
1996-04
影响因子：
4.1
通讯作者：
C. Bjerrum-Niese;L. Bjørnø;M. Pinto;B. Quellec
中科院分区：
文献类型：
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作者：
C. Bjerrum-Niese;L. Bjørnø;M. Pinto;B. Quellec
本文讨论了一种模拟浅水中高数据速率声通信的仿真工具的开发。该仿真工具能够生成在换能器阵列接收到的信号经过浅水通信信道传输后的合成时间序列。该仿真工具适用于测试用于消息恢复的高级信号处理技术。基于声通道的物理特性，建立了一个通道模型。特别强调了时变多径效应引起的信号传输波动。在较短的范围内，时间变化主要是来自移动海面的声散射。因此，通道模型产生的相干函数可以解释为表面散射声程的时变反射系数。一个静态的、与距离无关的射线模型识别重要的多路径，并用时变反射系数调制表面路径。讨论了通道模型的优点和局限性，并强调了克服这些局限性所必需的假设。基于这些假设，我们开发并实现了一种算法来模拟二进制信息在由换能器传输、在信道中失真并最终被换能器阵列接收时如何被调制。
The paper discusses the development of a simulation tool to model high data-rate acoustic communication in shallow water. The simulation tool is able to generate synthetic time series of signals received at a transducer array after transmission across a shallow-water communication channel. The simulation tool is suitable for testing advanced signal processing techniques for message recovery. A channel model has been developed based on the physical aspects of the acoustic channel. Special emphasis has been given to fluctuations of the signal transmission caused by time-varying multipath effects. At shorter ranges, the temporal variations are dominated by acoustic scattering from the moving sea surface. Therefore, the channel model produces a coherence function which may be interpreted as a time-varying reflection coefficient for the surface scattered acoustical path. A static, range-independent ray model identifies the significant multipaths, and the surface path is modulated with the time-varying reflection coefficient. The advantages and limitations of the channel model are discussed and assumptions necessary to overcome the limitations are emphasised. Based on the assumptions, an algorithm has been developed and implemented to model how a binary message will be modulated when transmitted by a transducer, is distorted in the channel and finally is received by a transducer array.