水声通信信道带宽非常有限。
The bandwidth of the underwater communication channel is very limited.
声信号处理，水声通信与网络，声无损检测。
Acoustic signal processing, underwater acoustic communication and network, acoustic nondestructive test.
水声通信组网技术是实施这些应用的关键技术。
Hydroacoustic network communications technology is the key technology to implement these applications.
本论文主要是对远程水声通信的信道编码技术进行研究。
In thesis, the channel coding technique suitable for long range underwater communication is researched.
相干调制是近年来水声通信领域中最为活跃的研究课题之一。
Coherent modulation has been one of the most active research fields in digital acoustic communication recently.
因此，实现高速、可靠的水声通信是一项具有挑战性的工作。
Therefore, realization of high-speed, reliable acoustic communication is a challenging task.
因此，本论文主要研究盲均衡技术在水声通信系统中的应用。
Therefore, this dissertation investigates the application of blind equalization technology in an acoustic communication system.
水声通信的优点，使得图像信号有可能以无线的方式传输到水面。
The advantage of underwater acoustic communication makes it possible to transmit underwater image by wireless means.
因此，本论文主要研究盲均衡技术在高速水声通信系统中的应用。
Therefore, this thesis investigates application of blind equalization technique in high speed underwater acoustic communication.
在未来的高科技研究领域中，水声通信技术已成为研究热点之一。
In the future high-tech research fields, UWA communications technology has become an active research field.
水声通信技术将在海洋环境监测和海洋工程中发挥越来越大的作用。
Underwater acoustic communication will play an increasing role in Marine environmental monitoring and engineering technology.
由于传输介质的不同，使得水声通信具有一些有别于电磁波通信的特点。
The characteristics of underwater acoustic communication are different from wireless communication because of different propagation media.
信道通带窄、多途干扰强、衰落严重是水声通信高速可靠传输信息的主要障碍。
Narrow channel band, severe multipath interferences and severe channel attenuation have demonstrated the great complexities and difficulties of high-speed UWA communications.
在水声通信中，由于发射和接收平台之间的相对运动，多普勒频移是无法避免的。
Doppler shift is unavoidable in underwater acoustic communications because of relative moving between the transmitter and the receiver.
水声通信技术在军用、民用、海洋资源开发、海洋环境考察等方面具有非凡的意义。
The technology of underwater acoustic communication in the military, civil, marine resources development, marine environment, such as inspection has extraordinary significance.
多普勒不仅造成宽带水声通信信号的载波频率偏移，而且引起码元符号的展宽或压缩。
Doppler effect causes not only carrier frequency offset, but also symbol expansion or compression for wideband acoustic communication signal.
同时对该方法的性能进行了外场水库实验，验证了它在低信噪比水声通信中的可行性。
Performance of this method was tested in field experimentation. Experimental results proved the feasibility of the method in UWA communication in low SNR environment.
由于水声信道与无线电信道有着许多相似之处，很多无线通信技术都值得水声通信借鉴。
There are a lot of similar characteristic between the underwater acoustic channels and the wireless channels, much wireless communication technology now can be used for reference.
本文围绕油井勘探系统中的水声通信系统，进行了通信系统的信号设计以及信号处理的研究工作。
This paper mainly investigates signal design and signal process method in the underwater acoustic communication subsystem of the oil well system.
为了减小水声通信系统中存在的由于多径传播效应引起的符号间干扰，可在系统中使用线性均衡器。
To induce inter symbol interference which is due to multipath transmit effect in the water acoustic communication system, linear equalization can be adopted in the system.
针对高速水声通信中信道的稀疏特性，提出了一种基于常数模准则的稀疏水声信道判决反馈盲均衡算法。
A blind equalization algorithm based on constant modulus and sparse underwater acoustic channel is presented according to the sparse characteristic of the high rate underwater acoustic communications.
在水声信道环境下，移动双方如何做到高速、高效、高精度的通信是水声通信领域的热点研究方向之一。
In underwater acoustic channel, how do mobile high-speed, high efficiency, high precision of communication is one of the hot researching directions in the field of underwater acoustic communication.
通过对采用不同组合级连码的性能仿真及分析可得出：RS码和卷积码的级连是用于水声通信的性能很好的串行级连码。
The principle and performance and arithmetic of coding and decoding of RS code and convolutional code and serial RS concatenated convolutional code are studied.
采用DDWS(直接数字合成)方法，产生了MFSK (m元频移键控)和OFDM(正交频分复用)两种水声通信信号。
And the method of DDWS (direct digital wave synthesis) is adopted to realize the signals of MFSK (multi-frequency shift keying) and OFDM (orthogonal frequency division multiplexing).
针对水声通信网单信道MAC协议时延长、吞吐量低、数据冲突频繁的缺点，提出了水声通信网的载波侦听双信道mac协议。
As the large delay, low throughput and frequent data collision in single-channel underwater acoustic networks, this paper devises a dual-channel MAC protocol based on carrier-sense.
文中详细介绍了基于声学调制解调器的声速剖面遥测系统的主要结构和功能，揭示了水声通信技术在深海非铠装缆测量中的应用优势。
The article introduces the configuration and function of SVP remote measurement system which base on the acoustic modem in detail. Finally open out the advantage…
文中详细介绍了基于声学调制解调器的声速剖面遥测系统的主要结构和功能，揭示了水声通信技术在深海非铠装缆测量中的应用优势。
The article introduces the configuration and function of SVP remote measurement system which base on the acoustic modem in detail. Finally open out the advantage…
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