检索结果-南通市图书馆

M-ary CDMA multiuser underwater acoustic communication and its experimental results

Science china(Information Sciences) 2011年第8期54卷 1747-1755页

作者： he chengbing 1,huang jianguo 1,yan zhenghua 2.& zhang qunfei 1 1 college of marine engineering,northwestern polytechnical university,xi’an 710072.china 2 china Ship Research and Development Academy,Beijing 100085,china college of marine engineering Northwestern Polytechnical University Xi’an China china Ship Research and Development Academy Beijing China

A novel M-ary code division multiple access (M-ary CDMA) underwater acoustic communication (UAC) that utilizes quasi-orthogonal sequences has been proposed for the multiple mobile unmanned underwater vehicle (UUV).Its performance has been verified in both four-user synchronous and three-user asynchronous scenarios through a lake experiment over a very shallow-water *** a chip rate of 2 kilochips per second,good bandwidth efficiency and robust links have been achieved both at 5 and 15 km *** performance of M-ary CDMA in mobile condition (3 m/s) is demonstrated by using the recorded lake experimental data. Experimental results show that the proposed scheme is suitable for multi-user communication platform in long-range shallow-water channel with simple receiver algorithms.

关键词： underwater acoustic communications M-ary code division multiple access (M-ary CDMA) Doppler shift compensation shallow-water acoustic network unmanned underwater vehicle

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Novel Spread Spectrum OFDM Underwater Acoustic Communication

A Novel Spread Spectrum OFDM Underwater Acoustic Communicati...

引用

2006 the IET International Conference on Wireless Mobile & Multimedia Networks

作者： jianguo huang chengbing he qunfei zhang Jing Han college of marine northwestern polytechnical university xi’an 710072 P.R.china

＜正＞Spread spectrum methods are used in underwater acoustic communication （UAC） systems to provide robust acoustic links or long distance communication abilities. However, the bandwidths of ocean channels limit the data rate of spread spectrum UAC. The method using quasi-orthogonal sequences with phase shift keying and parallel transmission to increase the data rate of spread spectrum UAC can be found in Refs.1 and 2. In this paper, we apply OFDM to realize parallel transmission of spread spectrum signal. Firstly, spread spectrum OFDM （SS-OFDM） is introduced into UAC. Then, a novel SS-OFDM method named MSS-OFDM based on M-ary quasi-orthogonal sequences is proposed in this paper. The processing gain of SS-OFDM is 10 * log 10 （L）, where L is the length of PN sequence used in SS-OFDM. The bit error rate （BER） performance of SS-OFDM and MSS-OFDM compare to OFDM is analyzed and simulated in AWGN channel. Computer simulation results using multi-path channel model based on lake test data show that MSS-OFDM has double anti-multipath abilities, which can significantly improve the data rate of spread spectrum UAC with a robust performance, even without cycle prefix. Water tank experiments were conducted to check this novel method. Simulation and test results show that MSS-OFDM can provide robust and moderate high-speed spread spectrum UWA communication.

关键词： Underwater acoustic communication OFDM spread spectrum

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：