A covert underwater acoustic communication method based on spread spectrum digital watermarking
A covert underwater acoustic communication method based on spread spectrum digital watermarking
复制标题
DOI：
10.1121/1.4970211
复制
发表时间：
2016-11
影响因子：
2.4
通讯作者：
Shaofan Yang;Zhongyuan Guo;Qunyan Ren;Shengming Guo
中科院分区：
文献类型：
--
作者：
Shaofan Yang;Zhongyuan Guo;Qunyan Ren;Shengming Guo
在要求隐蔽传输内容或隐蔽发射机位置的情况下，隐蔽水声通信是必要的。本文设计了信号发射器和信息检测器，将扩频数字水印（SSDW）隐藏在作为载体的海豚口哨声的对数谱中，并在同一对数谱中通过匹配滤波检测到扩频数字水印。信道中的噪声、载波和多径等因素都会降低该方法的性能。为了分析二者的作用，分别从加性高斯噪声信道和水下时变声学多径信道两种情况下，建立了相应的对数谱域信道模型。结果表明，信道噪声和载波的影响相当于附加在正确决策上的两个加性高斯噪声项的影响，并且该方法具有良好的多径扩展容忍性能。得到的初步结果是……
The covert underwater acoustic communication is necessary under some circumstances when the contents of transmission or location of transmitter are required to be concealed. In this paper, the signal transmitter and the information detector are designed, which hides the spread spectrum digital watermark (SSDW) into the log-spectrum of dolphin whistles that are as a carrier and detects SSDW by matched filtering in the same log-spectrum. Various factors of noise, carrier and multipath in channels may degrade the performance of the method. In order to analyze their effects, corresponding channel models in log-spectrum domain are derived from the additive Gaussian noise channel and the underwater time-varying acoustic multipath channel. Results suggests that the effects of channel noise and the carrier are equivalent to that of two additive Gaussian noise terms attached to the correct decision and the proposed method also has a good multipath extension tolerance performance. Preliminary results obtained form ...