EARS: Collaborative Research: Full-Duplex Cognitive Radio: A New Design Paradigm for Enhancing Spectrum Usage

随着人们对数据速率需求的快速增长，频谱资源变得越来越紧缺。认知无线电(CR)技术作为一种很有前途的提高频谱利用效率的技术，通过允许非许可用户在许可频段内共存，具有满足这一需求的巨大潜力。在传统的认知无线电系统中，频谱侦听在数据传输之前的每个时隙的开始处执行。这不幸地导致了两个主要问题：1)由于感测而减少了传输时间，以及2)由于数据传输而导致感测精度降低。为了解决这些问题，通过探索全双工(FD)技术来同时实现频谱感知和数据传输，提出了一种新的未来认知无线电的设计方案。该提案的目的是通过解决协议设计和理论分析等一系列变革性的挑战，将前景看好的概念框架转化为实际的无线网络设计。该教育计划将为研究生和本科生提供跨学科培训。学生的积极参与是通过指导、研究和参与试验台开发来确保的。将组织针对高中生，特别是妇女和少数群体的外联活动。通过出版物、教程、研讨会和在线工具确保广泛传播。拟议的研究旨在通过一个跨学科框架为FDCR网络奠定基础，该框架将信号处理、无线通信、网络和射频硬件设计的概念协同结合，以产生几项创新：1.通过多输入多输出(MIMO)FD无线电，二次用户可以同时感知和访问空闲频谱，从而显著改善感知性能，同时提高数据传输效率。研究的问题是使用MIMO来联合考虑主用户接收器和FD自干扰。2.经典的CR网络采用先听后说的方式，而FD则采用先听后说的方式，可以显著提高网络性能。研究的问题是调查两者之间的权衡。3.经典的多址接入协议基于载波侦听多址接入/冲突避免(CSMA/CA)，而FD支持冲突检测(CSMA/CD)。研究课题是分析在自干扰情况下的性能。4.建议的FD网络协议将使用配备MIMO技术的WARP板进行测试。

With the rapid growth of demand for ever-increasing data rate, spectrum resources have become more and more scarce. As a promising technique to increase the efficiency of the spectrum utilization, cognitive radio (CR) technique has the great potential to meet such a requirement by allowing unlicensed users to coexist in licensed bands. In conventional CR systems, the spectrum sensing is performed at the beginning of each time slot before the data transmission. This unfortunately results in two major problems: 1) transmission time reduction due to sensing, and 2) sensing accuracy impairment due to data transmission. To tackle these problems, a new design for future CR is proposed by exploring the full-duplex (FD) techniques to achieve the simultaneous spectrum sensing and data transmission. The aim of this proposal is to transform the promising conceptual framework into the practical wireless network design by addressing a diverse set of transformative challenges such as protocol design and theoretical analysis. The educational plan will provide interdisciplinary training for graduate and undergraduate students. Active student involvement is ensured via mentoring, research involvement, and participation in testbed development. Outreach events targeting high school students, particularly women and minority, will be organized. Broad dissemination is guaranteed via publications, tutorials, workshops, and online tools.The proposed research aims at laying the foundations of FD CR networks via an interdisciplinary framework that synergistically marries concepts from signal processing, wireless communications, networking, and RF hardware design to yield several innovations: 1. With multiple input and multiple output (MIMO) FD radios, secondary users can simultaneously sense and access the vacant spectrum, and thus, significantly improve sensing performances and meanwhile increase data transmission efficiency. The research issue is using MIMO to jointly considering primary user receivers and FD self-interference. 2. Classic CR networks using listen-before-talk, while FD enable listen-and-talk, which can significantly improve the network performances. The research issues are to investigate the tradeoffs. 3. The classical multiple random access protocol is based on carrier sensing multiple access/collision avoidance (CSMA/CA), while FD enables collision detection (CSMA/CD). The research issue is to analyze the performances under self interference. 4. The proposed FD network protocols will be tested using WARP boards equipped with MIMO technology.