uwa

Design and Implementation of an Adaptive High Speed UWA Voice Communication System

高速自适应水声语音系统的设计与实现

This article focuses on UWA channel modeling and simulation research .

本文主要进行水声信道的建模与仿真的研究工作。

The technology shows a good application promise on UWA communications .

仿真计算结果表明该技术在水下声通信中有很好的应用前景。

In this subject the PDS system is used to realize UWA communication .

在本课题中采用了PDS（Pattern-时延差编码）体制来实现水声通信。

In the future high-tech research fields , UWA communications technology has become an active research field .

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。

Simulation and Test of an OFDM System for Middle-Range Uwa Communication

OFDM中程水声通信系统仿真及实验

In addition , combined with OFDM technology , the image transmission system in UWA channel is set up .

并进一步结合OFDM技术，初步实现了水下图像的传输。

The Study of Routing Protocols for UWA Networks

水声通信网络路由协议研究

UWA graduates are held in high regard by Australian and overseas employers .

毕业于UWA的学生在澳大利亚和海外雇主中享有盛誉。

Underwater acoustic ( UWA ) communication technology is the primer tool to study and develop the ocean .

火声通信技巧非研讨和开收海土的从要工具之一。

A UWA channel model including the time-varying fading , multipath and additive noise is built .

建立了包括时变衰落、多途和加性干扰的水声信道模型。

Application of Linear Inserting-Values Arithmetic and so on in UWA OFDM System 's Frequency Field Equalization

线性插值算法等在OFDM水声通信系统频域均衡中的应用研究

With the LFM pulse frame synchronization method , the performance of UWA communication system based on DPSK is apparently improved .

同时运用线性调频脉冲帧同步法，改善了基于差分相移键控的水声数字通信系统的性能。

In recent years , the efficiency and the quality of UWA is improved by introducing blind equalization and spread spectrum techniques .

近年来，将盲均衡和扩频技术引入到水声通信中，有效的提高了复杂水声信道的通信效率和质量。

Channel equalization is of great necessary for the successful UWA communications because of the complexity of underwater acoustic channels .

由于海洋信道的复杂性，要实现可靠的水下声通信，必须进行有效的信道匹配。

Discusses the unfavorable effects of the shallow water acoustic channels on data transmission , and objectively introduces recent certain advanced in UWA communication .

论文主要进行了以下几个方面的研究工作：1.分析了浅海声传输特点和对水声数据传输的不利影响，并较客观和全面地综述了浅海域水声通信技术的研究概况；

This thesis focuses on the phase coherent UWA communication techniques . Phase Coherent Frequency-hopped Waveform Synthesis by Using the SAW Chirp Transform

本文对相位相干通信技术在水声信道中的应用进行了深入的研究。SAWChirp变换综合相干捷变频信号

Firstly , the basic model and express form are introduced , also the necessity of channel estimation and equalization in OFDM UWA communication is discussed .

论文首先介绍了OFDM的基本模型和表示形式，在此基础上讨论了在OFDM水声通信中进行信道估计和均衡的必要性。

With the developments of advanced equalization and carrier synchronization techniques , the applications of high-speed phase coherent UWA communications seem more feasible .

随着性能更佳的均衡技术和载波同步技术的出现，使得相位相干通信技术在高速水声通信中的应用已成为可能。

These characteristics seriously affect the data transmission rate , reliable data communication , available radio range , the throughput of network and energy expended in UWA .

这些干扰严重影响了水声传感器网络的数据传输速率、数据通信的可靠性、有效的通信距离、网络的吞吐量和能量消耗。

In the fading channel with high noise , e.g.mobile communication channel and UWA channel , JSCC gets better performance than separated coding .

在严重噪声的衰落信道（移动通信信道、水声信道等）中，采用联合编码技术比采用分离编码技术更能获得令人满意的效果。

The Inter-Symbol Interference ( ISI ) caused by the multipath channel is the primary hazard to restrict the development of UWA communication .

水声信道较无线电通信信道要复杂的多，由多途扩展引起的码间干扰是限制水声通信发展的主要障碍。

Underwater acoustic ( UWA ) propagation is mainly restricted by three factors : attenuation increased with frequency , time-varying multipath , and relatively low sound speed .

水中声传播受三个主要因素制约：随信号频率增大的衰减，时变的传播多径以及较慢的传播速度。

Underwater acoustic ( UWA ) communication which is not only used in military , but also used in commercial and civilian areas is an important field in underwater acoustic research .

水声通信一直是水声研究中的一个重要领域，它不但具有强烈的军事应用背景，更是商业和民用领域中不可或缺的水下数据传输手段。

Characterized as a time - varying and space-varying channel , underwater acoustic ( UWA ) channel is a typical frequency-selective fading channel .

水声信道具有时变、空变的传输特性，是一种典型的频率选择性衰落信道。

New ARC-FSK Modulation for Middle-Range Muti-Carrier UWA Communication

ARC-FSK中程多载波水声通信新技术

So it is necessary to design a useful algorithm to realize blind equalization , and to produce simple effective spread spectrum sequences to improve the anti-interference ability of UWA .

因此，需要设计有效的盲均衡算法来提高均衡器均衡性能；产生简单有效的扩频序列来提高水声通信的抗干扰能力。

However , poor conditions of transmission , serious noise background , time and frequency selective fading , the limited bandwidth of channel result in serious distortion of UWA communication signals .

但由于水声通信传输条件恶劣，存在严重的噪声背景，并且水下声信道的带宽十分有限，再加上复杂的多径传播和时间、频率选择性衰落，导致水声通信信号严重畸变。

An UWA spread-spectrum communication system was designed and realized by using the good performances of anti-multipath , anti-jamming and low SNR diction of spread-spectrum communication technology .

针对水下声信道的独特环境，利用扩频通信技术的抗多途、抗干扰、低信噪比检测等优良性能，设计并实现了一个水声扩频通信系统。

The characteristics of low synchronization accuracy , strong anti-doppler ability and high reliability render SS communication based on difference coherent demodulation to be applied in high speed UWA communication .

本文研究了差分相干调相直扩通信系统，它对同步的精度要求较低，具有较强的抗多普勒能力，是一种稳健的通信方式，能够应用于水声移动通信。