电波科学学报2016，Vol.31Issue(5)：920-926,7.DOI:10.13443/j.cjrs.2016022401
基于扩频的频谱水印嵌入与提取方法研究及实现
Research and implement of spectrum watermark embedding and extracting method based on spread spectrum
摘要
Abstract
To effectively identify the radio system,this paper presents a spectrum watermark embed-ding and extracting method based on the spread spectrum.The spectrum watermark identifying the radio equipment is modulated by the spread spectrum code with high code rate and long code length at the trans-mitting terminal,and is periodically embedded in the communication signals based on the additive rule. The received intermediate frequency communication signal is divided into N segments at the receiving ter-minal.The spectrum watermark can be obtained by the fusion decision based on the demodulation of these segmented signals.The experiment system testing the proposed method is built based on the USRP plat-form.Theory analysis and experiment results show that the proposed method can effectively extract the spectrum watermark with no harmful inference to normal demodulation of the communication signal,and there is no need to demodulate the communication signal.The proposed method can effectively reduce the complexity of spectrum watermark extraction which provides a technique support for effectively identifying and ascertaining the radio system.关键词
频谱水印/扩频/频谱水印嵌入/频谱水印提取/USRP 平台Key words
spectrum watermark/spread spectrum/spectrum watermark embedding/spectrum wa-termark extracting/USRP platform分类
信息技术与安全科学引用本文复制引用
张余,许金勇,柳永祥,陈勇,刘忠英..基于扩频的频谱水印嵌入与提取方法研究及实现[J].电波科学学报,2016,31(5):920-926,7.基金项目
国家自然科学基金(No.61102092 （）
61471395) （）
