时延CSIT的安全干扰对齐理论与算法研究

With the simultaneous access of a huge number of users, wireless communications systems are facing two chanllenges: information security and interference. To tackle this two problems， secure interference alignment was proposed by the academia. Its aim is to characterize the optimum achievable secerecy degrees of freedom of wireless systems when there exists malicious users and provide the achievable scheme. In this subject, we plan to analyze the impact of time delay of channel state information at transmitters (CSIT) on the secrecy degrees of freedom under different secrecy circumstances, and propose new achievable schemes of secure interference alignment, thus can promote the theoretical research on interference alignment and physical layer security. Consequently, our subject can provide theoretical basis and support for the applicaition of interference alignment on future military secret communications and the 5th generation (5G) mobile communications.

随着大量用户的同时接入，无线通信系统面临着两大难题：信息安全与干扰。为了解决这两个难题，学术界提出了安全干扰对齐。其目标在于表征当信道存在恶意用户时，无线通信系统能获得的最优安全自由度，并给出安全自由度的可达方案。本项目拟分析发射机信道状态信息 （Channel State Information at Transmitters, CSIT） 的时间延迟对不同场景的安全自由度的影响，提出新的安全干扰对齐的可达方案，进一步完善干扰对齐和物理层安全技术的理论研究，为干扰对齐在未来军事保密通信和第五代移动通信 （The 5th Generation, 5G）中的应用提供理论基础和支撑。