正交频分复用水声通信子载波干扰抑制.pdf

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1、第34卷第5期沈阳工业大学学报VO1．34No．52012年9月JournalofShenyangUniversityofTechnologySep．2012文章编号：1000—1646(2012)05—0556—06正交频分复用水声通信子载波干扰抑制术马雪飞，乔钢，赵春晖，郑彩云(哈尔滨工程大学a．水声国彖重点实验室，b．信息与通信工程学院，哈尔滨150001)摘要：在引入正交频分复用调制技术的水声通信中，发送端与接收端采样频率偏差及多普勒频移会引起子载波间的干扰，为了抑制信号产生幅度衰落和相位畸变并降低系统误码率

2、，根据多载波水声通信的特点提出了一种抑制载波间干扰的方法．利用导频序列拟合出采样频偏，通过重采样滤波器进行补偿，对多普勒因子粗补后，利用各象限解调数据方差的极小值确定解调数据长度，通过高分辨率傅里叶变换实现多普勒干扰抑制．3次实验结果证明该方法有效可行，能够较好地抑制子载波干扰，可显著提高多载波水声通信的系统性能．关键词：水声通信；正交频分复用；子载波干扰抑制；采样频偏；多普勒频移；数据拟合；重采样滤波器；高分辨率傅里叶变换中图分类号：TN914．5文献标志码：ASub—carrierinterferencesupp

3、ressionforunderwateracousticcommunicationappliedorthogonalfrequencydivisionmultiplexingMAXue-fei，QIAOGang。，ZHAOChun．hui，ZHENGCai—yun(a．NationalKeyLaboratoryofUnderwaterAcousticTechnology，b．SchoolofInformationandCommunicationEngineering，HarbinEngineeringUniversi

4、ty，Harbin150001，China)Abstract：Intheunderwateracousticcommunicationappliedtheorthogonalfrequencydivisionmultiplexingmodulationtechnology，thesamplingfrequencyoffsetandDopplerfrequencyshiftbetweentransmittersandreceiverswouldcausetheinmrferencebetweensub—carders．

5、Inordertoinhibittheamplitudefadingandphasedistortionofsignalsaswellasdecreasethebiterrorrateofsystem，amethodforsuppressingtheinterferencebetweensub-carderswasproposedaccordingtothecharacteristicsofmulti-·carderunderwateracousticcommunication．Thesamplingfrequenc

6、yoffsetwasfittedwithpilotsequenceandcompensatedbyresamplingfilter．AftertheroughcompensationofDopplerfactors，thelengthofdemodulateddatawasdeterminedwiththeminimumvalueofvarianceofdemodulateddataindifferentquadrants．ThentheDopplerinterferencesuppressionwasrealize

7、dwithhighresolutionFouriertransform．Theresultsofthreeexperimentsshowthattheproposedmethodiseffectiveandfeasible，andcannotonlysuppressthesub—carderinterferencebetter，butalsoobviouslyenhancetheperformanceofmulti．carderunderwateracousticcommunicationsystem．Keyword

8、s：underwateracousticcommunication；orthogonalfrequencydivisionmultiplexing；sub—carderinterferencesuppression；samplingfrequencyoffset；Dopplerfrequencyshift；datafitting；resampl