通信信号中的隐蔽信息传输机理研究

项目名称： 通信信号中的隐蔽信息传输机理研究

项目编号： No.61501195

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 徐争光

作者单位： 华中科技大学

项目金额： 19万元

中文摘要： 信息隐蔽传输技术一直是一个研究的热门课题，但是大多数研究的载体是多媒体数字信号，即数字水印技术。本项目则将研究的对象转移到通信信号上，主要研究通信信号中的隐蔽信息传输技术，我们称之为通信水印。多媒体数字水印系统性能主要由信号保真度来评价，但是衡量通信系统性能的主要指标是误码率，因此通信水印的隐蔽性和可靠性体现在原有通信信息和附加隐蔽信息的误码率指标上。本项目针对通信体制中常见的调制方式，通过建立通信水印的传输模型，分析信道容量；并设计通信水印的生成、嵌入和提取方案，搭建试验验证系统；最后对通信水印系统的隐蔽性和可靠性给出定量的评估指标，找出影响性能的主要参数，并以此为基础对系统性能进行优化。本项目研究试图揭示影响通信信号中隐蔽信息传输性能（即传输速率、隐蔽性和可靠性）的主要因素，建立通信水印传输理论，为通信信号中的隐蔽信息传输系统设计提供解决方案。

中文关键词： 通信信号处理；隐蔽信息传输；信道容量；通信水印

英文摘要： Information covert transmission technology is an energetic research topic, but most research focus on the multimedia digital signal, i.e. digital watermarking technology. The project is to solve the problems about the covert information transmission in communication signals, which is called as communication watermark in the project. The performance of the multimedia digital watermarking system is evaluated by fidelity, but the performance of the communication system is evaluated by bit error rate. Therefore, the imperceptible and robust performance of the communication watermarking should be redefined, which are shown that the bit error rates of the original information and the covert information are both less than the specific criterion. For the modulated signals in the common communication system, we establish the covert information transmission model to analyze the channel capacity. Then we design the watermark generation, embedding and extraction scheme, based on which the test system is established to verify the scheme. Finally, we investigate the quantitative assessment methods for the imperceptible and robust characteristics of the watermarking system, find the main parameters for determining the performance, and optimize the system parameters by the evaluation results. This project attempts to reveal the factors that determine the performance of the communication watermarking system, i.e. transmission bit rate, imperceptibility and robustness. Then we establish the transmission theory of the communication watermarking and provide the solution for the design of the covert information transmission scheme in the communication system.

英文关键词： communication signal processing;covert information transmission;channel capacity;communication watermarking