Collaborative Research: Multiuser Wireless Security

摘要：无线通信对我们社会的各个方面和我们的生活方式产生了深远的影响；从我们如何做生意，到我们如何教育；从我们如何处理紧急情况，到我们如何照顾病人和老人。能够在任何时间、任何地点交换任何数量的信息的承诺，促使越来越多的用户完全依赖他们的无线设备来交流敏感信息。因此，向更多的用户提供广泛的无线服务，同时保证信息的安全变得至关重要。到目前为止，无线系统设计的目标仅仅是提供高容量。本研究探讨确保资讯安全传送的高容量无线系统的基本设计原则。本研究包括为设计多用户物理层开发一个综合框架，旨在为所有用户实现高容量和安全传输。该研究解决了入侵者的存在，其目的是通过制造故意干扰来破坏通信，即干扰器；拦截通信并试图解码用户信息的入侵者，即窃听者；以及窃听通信然后故意制造干扰的入侵者，即相关干扰者。假设入侵者能够损害多用户系统的各种级别，并使用这些场景作为物理层设计中的附加设计约束，本研究试图在存在安全威胁的情况下，在非衰落和衰落信道中建立各种多用户系统的性能限制；系统实体（即发送者和接收者）在物理层共同应对安全威胁的方式；并给出了使入侵者失效的用户的联合最优传输策略。研究人员研究了各种多用户信道，包括标量、波形和矢量多址和广播场景，以及中继和协作通信场景，并确定了各种无线网络容量与安全性的基本设计权衡。

Title: Collaborative Research: Multiuser Wireless SecurityAbstract:Wireless communications has had a profound effect on various aspects of our society and our way of life; from how we do business, to how we educate; from how we handle emergency situations, to how we care for patients and elderly. The promise of being able to exchange any amount of information, anytime, anywhere is prompting more and more subscribers to rely solely on their wireless devices for communicating sensitive nformation. As a result, offering a wide range of wireless services to more subscribers while preserving the security of information is becoming essential. Wireless system design efforts so far has aimed solely on providing high capacity. This research nvestigates the fundamental design principles of high capacity ireless systems that ensure secure information delivery.This research includes the development of a comprehensive framework for the design of the multiuser physical layer that aims at achieving high capacity and secure transmissions for all users. The research addresses the existence of intruders that aim to disrupt communication by creating intentional interference, i.e., jammers; intruders that intercept the communication and attempt to decode the information of the users, i.e., eavesdroppers; and intruders that listen in on the communication and then create intentional interference accordingly, i.e., correlated jammers. Assuming a variety of levels at which the intruders are capable to harm the multiuser system, and using these scenarios as additional design constraints in the physical layer design, this research seeks to establish the performance limits of a variety of multiuser systems in nonfading and fading channels in the presence of security threats; the ways in which the system entities, i.e., transmitters and receivers, can collectively cope with security threats at the physical layer; and the jointly optimum transmit strategies for the users that render the intruders ineffective. The investigators study a variety of multiuser channels including scalar, waveform and vector multiple access and broadcast scenarios, as well as relay and cooperative communication scenarios and identify the fundamental design trade-offs for capacity versus security for a variety of wireless networks.