%0 Journal Article
%T Code divided multiple access underwater acoustic communication based on active acoustic intensity average<br>基于单矢量有源平均声强器的码分多址水声通信
%A Yin Jing-Wei
%A Yang Sen
%A Du Peng-Yu
%A Yu Yun
%A Chen Yang
%A <br>殷敬伟
%A 杨森
%A 杜鹏宇
%A 余赟
%A 陈阳
%J 物理学报
%D 2012
%I 
%X Code divided multiple access (CDMA) underwater communication based on single vector sensor is studied in this paper. The most common methods to estimate azimuth with self-directivity of single vector sensor are average sound intensity method and complex sound intensity method, however, for the same frequency band multi-users, these methods are limited to the measurement of azimuths only for two users at the same time theoretically. An active average intensity method, which measures the azimuths of multi-users simultaneously with the excellent correlative characteristics of pseudo-random code in spread spectrum communication, is proposed in this paper. With the estimated azimuth, vector combination can be generated to adjust the directivity of vector sensor, achieve multi-user beam communication, inhibit multi-path interference, and enhance processing gain and lower error rate. Simulation and experiment for same frequency band spread spectrum multi-user communication testify the feasibility and utility of active average sound intensity method.
%K underwater acoustic communication
%K CDMA
%K single vector sensor
%K active acoustic intensity average<br>水声通信
%K 码分多址
%K 单矢量传感器
%K 有源平均声强器
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=78F360FC29C47911CC58C7D11D37B52D&yid=99E9153A83D4CB11&vid=1D0FA33DA02ABACD&iid=B31275AF3241DB2D&sid=A03D96EE4BEA5425&eid=1555AC1CDFD10133&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=13