【摘要】 水声信道是较复杂的数据通信环境。本文设计了3种高速水声通信的系统结构,并通过系统的、全面的仿真比较了他们的性能。建立了包括时变衰落、多途和加性干扰的水声信道模型。3种方案都采用相位相干的QPSK调制技术,接收端采用空时联合的自适应均衡(内置DPLL)接收;前向纠错编码译码器分别采用3种方案:卷积码,串行级联码(卷积码+RS码),并行级联卷积码(Turbo码)。通过仿真研究了不同数目水声接收机的接收分集下的系统性能,研究了3种编码方案下的系统性能。更多还原

【Abstract】 The UWA (Underwater Acoustic) channel is probably one of the most complicated environments for data communication. Three structures of high speed UWA communication systems are designed. And performance is compared through the systemic simulations. A UWA channel model including the time-varying fading, multipath and additive noise is built. All of the three schemes use the phase-coherent QPSK modulation techniques. Spatio-temporal processing combined space diversity and adaptive equalizer (with DPLL embedded) is used in the receiver. There are three forward error correct coding schemes: convolutional codes, serial concatenated code (convolutional code + RS code), parallel concatenated code (Turbo code). The performance of the systems using the different number of the water acoustic receivers to achieve diversity is studied. And the performance of the systems utilizing three coding schemes is studied.更多还原