盲均衡技术在水声信道高速率数据传输中的应用

【作者】 石杰；

【导师】 王英民；

【作者基本信息】 西北工业大学 ， 水声工程， 2002， 硕士

【摘要】 在水声数字通信系统中，声波传播的多途效应会引起严重的码间干扰，使水下数据传输的可靠性和数据传输速率都大大的降低。为解决此问题，一个有效的方法是在接收端采用信道均衡技术。但是由于水声信道的随机时变性，传统的均衡技术需要周期性的发送收端已知的训练码来跟踪信道的变化，这样做虽然提高了数据传输的可靠性，但是系统的重复训练大大的降低了通信效率，在水声信道高速率数据传输中并不适用。针对传统的信道均衡技术的缺陷，本论文研究了不需要训练码就能直接进行信道均衡的盲均衡技术。 本论文对几种应用比较广泛的盲均衡算法进行了研究，对它们的原理和结构进行了描述，并且分别对其在特定的水声信道中的性能进行了理论仿真，得到了满意的结果，并且对这几种算法进行了比较。更多还原

【Abstract】 In the field of underwater acoustic communications, the intersymbol interference caused by multipath effects will make the reliability and the rate of the propagation of underwater acoustic signals. To settle this problem, an effective way is adopting an equalizer at the receiver. But the traditional adaptive equalizers need periodically retrained, because the underwater acoustic channel is a stochastic time-varying channel. Although the traditional adaptive equalizer increase the reliability of the propagation, the rate of it is decreased. So they are not very applicable in the field of the propagation of high rate signals through an underwater acoustic channel. To overcome the defect of the adaptive equalizers, this thesis deal with the technique of the blind equalization that need not the training period.This thesis investigates a few of blind equalization algorithms that are broadly used. These equalizers’ structures and principles are introduced in detail. The convergence properties of these equalizers applying in certain underwater acoustic channels are analyzed mathematically by computer simulations. The computer simulations provide satisfactional results.更多还原