Constellation-constrained capacities for parametric underwater communication
Constellation-constrained capacities for parametric underwater communication
复制标题
参数化水下通信的星座受限容量
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
T. Weber
中科院分区：
文献类型：
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作者：
K. Wiedmann;T. Weber
本文分析了采用鲁棒正交调幅调制的参数化水下通信系统的星座约束能力。参数化水下通信（PUC）系统利用水下信道中的非线性效应进行数据传输。为了从信息论的角度进行性能分析，在物理建模的基础上建立了PUC的非线性信道模型。在此基础上，讨论了鲁棒调制，并推导了时间离散等效低通信道模型。在此基础上，引入了合适的星座，并确定了相应的可实现传输速率。为了评估整体性能损失，对系统可达到的最大传输速率（即所考虑的等效低通信道的信道容量）进行了数值计算。为此，将非线性信道转换为具有自适应约束的线性信道。这些结果从信息论的角度对PUC系统的性能提供了有价值的见解，并为系统设计提供了支持。
In this paper, constellations-constrained capacities of a parametric underwater communication system, which employs robust modulation for quadrature-amplitude-modulation, are analysed. A parametric underwater communication (PUC) system uses nonlinear effects in the underwater channel for data transmission. For performance analysis from the information theoretical point of view, a nonlinear channel model for PUC is derived from the physical modelling. On this basis, robust modulation is discussed and a time-discrete equivalent lowpass channel model is derived. According to this, appropriate constellations are introduced and the corresponding achievable transmission rates are determined. To evaluate the overall performance loss, the maximum achievable transmission rate of the system, which is the channel capacity of the considered equivalent lowpass channel, is calculated numerically. For this purpose, the nonlinear channel is transformed to a linear channel with adapted constraints. The results give valuable insights in the performance of a PUC system from the information theoretical point of view and support the system design.