【作者】 殷敬伟；

【导师】 惠俊英；

【作者基本信息】 哈尔滨工程大学 ， 水声工程， 2006， 硕士

【摘要】 发展水声通信技术无论在军事领域还是在商业领域，都有着重大意义。实时、高速、稳健的点对点通信是构建水下信息网的基础。但水下声信道相对于无线电通信信道要复杂的多，其多途扩展引起的码间干扰是实现水声通信的一个重要障碍。基于此，本文研究了Pattern时延差编码(PDS)通信体制和时间反转镜(TRM)技术。 Pattern时延差编码通信体制属于脉位编码，信息调制在Pattern码出现在码元窗的时延差信息中，占空比小，可以节省系统功耗。PDS通信体制采用多种不同Pattern码波形来进行码元分割以抑制码间干扰；提出通过频率分割可实现Ⅳ通信信道同时工作以提高通信速率。为了克服大的多途扩展就要选取更多的Pattern码，但可选的种数是受限的。所以对于多途扩展大、更为复杂的水文环境，就要采用更为有效的办法。 时间反转镜处理将海洋信道自身视为匹配滤波器，具有时间压缩、空间聚焦特性，可以重组多径信号减小信道衰落。将时间反转镜技术应用于PDS水声通信体制，可以对接收的信号进行时间压缩，抑制多途扩展引起的码间干扰，使PDS通信体制实现更为简易。 本文提出单阵元被动式时间反转镜技术(PTRM)。单阵元PTRM既克服了主动式时反镜信号双向传输、效率低下且要求阵元收发合置的弊端，又克服了基阵处理对水下通信节点不适用的障碍。提出将单阵元被动式时反镜技术应用于PDS通信体制，构成单阵元被动式时反镜PDS通信系统(PTRM-PDS)。 通过计算机仿真及湖试验证，单阵元被动时间反转镜技术可以匹配于声信道，具有很好的鲁棒性，将其应用于PDS通信体制中，有效地消除了声信道多途扩展对Pattern波形的畸变，可以抑制码间干扰改善通信质量。单阵元PTRM-PDS技术对于水下信息网多节点组网通信，将具有一定实用价值。更多还原

【Abstract】 Developing the underwater acoustic communication is significant not only in the military affairs but also in the commercial fields. The point-to-point communication is the basement of the underwater acoustic networks which should be real-time, high speed and robust. However, the UWA channel is more complex compared to the wireless channel and the inter-symbol interference (ISI) caused by multipath channel is an important obstacle for realizing the UWA communication. Therefore, this thesis will discuss the topic about Pattern Time Delay Shift Coding (PDS) system and Time Reversal Mirror (TRM) technology.Pattern Time Delay Shift Coding system belongs to the Pulse Position Modulation (PPM) that the digital information are encoded in the time delay shift values of the Pattern. The duty cycle is smaller than 1 which could economize the system energy. By using different Patterns for code division, the communication system has a high ability to mitigate the inter-symbol interference (ISI) caused by multipath channel. PDS system could increase the data rate by using different frequency for channel division. The system should select more Patterns in order to adapt to the bigger multipath spread time, but it is restricted. So we should adopt a more effective method for anti the ISI.Time Reversal Mirror can match the acoustic channel automatically and lead to an adaptive spatial focusing and a temporal compression. The application of the TRM to the UWA communication could eliminate or mitigate the inter-symbol interference (ISI) caused by acoustic channel’s multipath and delay spread.The single sensor Passive Time Reversal Mirror (PTRM) is studied in this thesis whose efficiency is higher than Active TRM and the applicability is better than the processing of array. This thesis proposes to apply the single sensor PTRM to the PDS system, which is called PTRM-PDS underwater acoustic communication system.The results of computer simulations and lake trials show that the Passive更多还原