基于扩频的频谱水印嵌入与提取方法研究及实现

发布时间：2018-03-01 15:07

本文关键词： 频谱水印扩频频谱水印嵌入频谱水印提取 USRP平台　出处：《电波科学学报》2016年05期 　论文类型：期刊论文

【摘要】：针对无线电系统身份识别问题,提出了一种基于扩频的频谱水印嵌入与提取方法,该方法中发射端首先选择一个码片速率高、码长长的扩频码来调制用于标识无线电系统身份的频谱水印信号,然后利用加性准则周期性地将其嵌入到无线电信号中.接收端首先将接收的中频信号分成N段,并对每段信号进行解扩和解调,最后利用N次解调结果实施综合融合判决来提取频谱水印.同时基于USRP平台构建了基于扩频的频谱水印嵌入与提取方法的验证系统,理论分析与实验验证结果表明:提出的方法能够在不对原始信号正常解调产生有害干扰的条件下,可有效提取频谱水印,具有较强的通用性和鲁棒性,为有效标识和识别无线电系统提供技术手段.
[Abstract]:A spectrum watermark embedding and extracting method based on spread spectrum is proposed to solve the problem of radio system identity identification. In this method, the transmitter first selects a high chip rate. The long spread spectrum code modulates the spectrum watermark signal used to identify the radio system, and periodically embeds it into the radio signal using the additive criterion. The receiving end first divides the received intermediate frequency signal into N segments. Each signal is despreaded and demodulated. Finally, the spectrum watermark is extracted by using the N times demodulation result. At the same time, a verification system of spectrum watermark embedding and extracting method based on spread spectrum is constructed based on USRP platform. The theoretical analysis and experimental results show that the proposed method can extract the spectrum watermark effectively without harmful interference to the normal demodulation of the original signal, and has strong generality and robustness. Provide technical means for effective identification and identification of radio systems.
【作者单位】：南京电讯技术研究所;
【基金】：国家自然科学基金(No.61102092;61471395)
【分类号】：TN97

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