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

随着数据速率的快速增长，频谱资源变得越来越稀缺。认知无线电（CR）技术作为一种提高频谱利用效率的技术，具有很大的潜力，它允许未授权用户在授权频段内共存。在传统的CR系统中，频谱感知在数据传输前的每个时隙开始进行。不幸的是，这导致了两个主要问题：1)由于传感而减少了传输时间；2)由于数据传输而降低了传感精度。为了解决这些问题，提出了一种新的未来CR设计方案，即探索全双工（FD）技术，实现频谱感知和数据传输的同时进行。本提案的目的是通过解决协议设计和理论分析等各种变革性挑战，将有希望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的培训。通过指导、研究参与和测试平台开发的参与，确保了学生的积极参与。将组织针对高中生，特别是女性和少数民族学生的外展活动。通过出版物、教程、研讨会和在线工具保证广泛传播。提出的研究旨在通过跨学科框架为FD CR网络奠定基础，该框架将信号处理，无线通信，网络和RF硬件设计的概念协同结合，以产生以下几项创新：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频谱，从而显著提高感知性能，同时提高数据传输效率。研究问题是利用MIMO联合考虑主用户接收机和FD自干扰。2. 经典CR网络采用先听后说，而FD网络采用先听后说，可以显著提高网络性能。研究的问题是调查权衡。3. 经典的多路随机接入协议是基于载波感知多路接入/避免碰撞（CSMA/CA），而FD是基于碰撞检测（CSMA/CD）。研究的问题是分析自干扰下的性能。4. 提出的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.