滤波多音调制水声通信方法研究  

Research on Filtered Multi-tone Modulation Underwater Acoustic Communication

作　　者：冉茂华[1] 黄建国[1] 韩晶[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《兵工学报》2011年第4期452-458,共7页Acta Armamentarii

基　　金：国家自然科学基金资助项目(60972152);教育部高等学校博士学科点专项科研基金(20070699020)

摘　　要：针对正交频分复用调制(OFDM)在时变水声信道的影响下系统性能恶化的问题,将无线通信中一种新的多载波通信方法———滤波多音调制(FMT)引入到水声通信中,利用其子载波频谱的强约束性克服水声信道的时变环境引起的载波频偏,从而抑制系统的子载波间干扰(ICI);同时,在接收端采用基于信道估计的分数阶判决反馈均衡技术来有效补偿由滤波器组及多径信道引起的码间干扰(ISI)。基于实测时变水声信道的通信仿真表明,在相同数据率情况下FMT较OFDM对时变的水声信道环境具有更好的稳健性,尤其适用于动平台上的高数据率水声通信。In the underwater acoustic OFDM communication,the channel variations may induce inter-carrier interference（ICI） and degrade the system performance significantly.In order to avoid this problem,a novel method named filtered multi-tone modulation（FMT） was introduced to the multi-carrier underwater acoustic communication.FMT can utilize its high spectrum containment to avoid ICI and the inter-symbol interference（ISI） can also be removed by using the fractional DFE equalization method based on the channel estimation in the receiver.Simulations were carried out on the basis of real underwater acoustic channel.The results demonstrate that FMT can get better performance than OFDM under the time-varying underwater acoustic channel and be especially applied to the high data rate communication on the moving platforms.

关 键 词：信息处理技术 水声通信 滤波多音调制 信道估计 均衡器 

分 类 号：TN911[电子电信—通信与信息系统]