摘要
针对正交频分复用水声通信中,为实时同步和多普勒补偿而频繁加入辅助数据使通信速率降低的问题,通过设置导频的相位和幅度,把导频转变为首尾相位连续的线性调频信号,该方法使同步与导频复用,同时可以进行多普勒估计,从而节省了额外加入线性调频信号所占用的时间.湖上试验结果表明:系统通信速率为0.25 bit/(s.Hz),未经纠错编码的最低误码率为2.68%,验证了该方法的可行性和有效性.
Information rate will be limited due to the aiding datas frequently added for synchronization and Doppler estimation in real time for orthogonal frequency division multiplexing（OFDM） systems in underwater acoustic communication.Thus,an algorithm was proposed in which pilot was transformed to linear frequency modulated（LFM） signal via setting the phase and amplititude of every subcarrier to make phases at the head and the tail continuous in temporally.Pilot-aided channel estimation was reused with synchronization detecting and pilot could also be used to estimate the Doppler frequency offset,saving the time of LFM signal.The lacustrine experiment was carried out.The system information rate is 0.25 bit/（s·Hz） and the minimum bit error rate without error-correcting codes is 2.68%.The results validate the feasibility and efficiency of the algorithm.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第8期80-83,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(60802060)
中央高校基本科研业务费专项资金资助项目(F030102)
海洋公益性行业科研专项经费资助项目(gz2010001)
哈尔滨工程大学水声技术重点实验室基金资助项目(9140C2002010902)
关键词
水声通信
正交频分复用(OFDM)
同步导频复用
线性调频信号
通信速率
underwater acoustic communication
orthogonal frequency division multiplexing
synchronization and pilot reusing
linear frequency modulated signal
information rate
