声屏蔽水下多址接入研究  

Research on Underwater Multiple Access Based on Acoustic Shielding

作　　者：惠俊英 王大宇 张光普 殷敬伟 王晓琳[2] 

机构地区：[1]哈尔滨工程大学水声技术国家级重点实验室,黑龙江哈尔滨150001 [2]中科院声学研究所,北京100190

出　　处：《兵工学报》2010年第6期703-709,共7页Acta Armamentarii

基　　金：国家自然科学基金资助项目(60802060);哈尔滨工程大学基础研究基金资助项目(HEUFT08026)

摘　　要：针对水下多用户通信中存在的多址干扰问题,提出一种基于声屏蔽的多址接入方法。声屏蔽是利用不同信源与接收阵之间的多途信道差异实现多址接入的。通过对接收信号的屏蔽聚焦处理,使得多址干扰被有效抑制,信源信号被时反聚焦后得到增强,多途影响将明显减弱。将声屏蔽与正交频分复用(OFDM)结合,设计出了基于声屏蔽的OFDM多用户通信系统,该系统可以在不占用额外带宽的条件下实现多用户通信。通过理论分析和仿真研究表明:声屏蔽不仅能够抑制多址干扰,同时也对期望信号进行聚焦,可以有效提高通信系统的数据吞吐量,降低误码率。此外,声屏蔽允许在同一方向上对不同用户同时通信。Aiming at multiple address interferences existing in multi-user communication, this paper proposes a method based on the acoustic shielding. It utilized the difference in multi-path between sources and receiving array to realize the multiple address access. After the received signal is shielded and focused, the multiple address interferences will be suppressed significantly and the energy of sources will be enhanced. Therefore, the negative effects caused by the multi-path can be decreased obviously. The acoustic shielding can be combined with OFDM to design OFDM multi-user communication system, which can realize the multi-user communication without occupying extra bandwidth. The simulation results and analyses indicate that the acoustic shielding can not only mitigate the multiple address interferences, but also focus the desired signals, thereby, improve the system＇s throughout and bit error ratio. Moreover, the acoustic shielding allows the synchronous communication with various users in the same direction.

关 键 词：通信技术 声屏蔽 OFDM 多址接入 

分 类 号：TB567[交通运输工程—水声工程]