NeTS-NBD: An Integrated Approach to Opportunistic Spectrum Access

NETS-NBD：机会性频谱接入的综合方法奖0627090庆赵基于主用户和次级用户的分层接入结构，机会性频谱接入解决了当前频谱管理命令和控制模式的低效问题，同时保持了与传统无线系统的兼容性。基本思想是允许辅助用户利用瞬时频谱可用性，并以非侵入性的方式与主用户通信。虽然概念上很简单，但机会主义频谱接入带来了传统网络中没有遇到的挑战。认知媒体访问控制与用于识别和利用瞬时频谱机会的信号处理相结合是核心技术基础之一。这项研究开发了能量和硬件约束下的机会频谱接入的算法和协议。正在开发的主要科学思想包括：(I)从观察中学习并随着时间的推移提供更好性能的认知感知和接入策略，(Ii)在没有中央控制器或专用通信/控制信道的自组织网络中的分布式协议实现，(Iii)机会频谱接入策略的最优化、复杂性和稳健性之间权衡的定量特征。这一研究为推动网络科学的发展做出了贡献。它为评估机会性频谱接入的潜力提供了技术数据。该项目所产生的特定研究课题为本科生和研究生提供了教育和研究机会。

NeTS-NBD: An Integrated Approach to Opportunistic Spectrum AccessAward 0627090Qing ZhaoBuilt upon a hierarchical access structure with primary and secondary users, opportunistic spectrum access resolves the inefficiency of the current command-and-control model of spectrum regulation while maintaining compatibility with legacy wireless systems. The basic idea is to allow secondary users to exploit instantaneous spectrum availability and communicate non-intrusively to primary users. While conceptually simple, opportunistic spectrum access presents challenges not encountered in conventional networks. Cognitive medium access control coupled with signal processing for identifying and exploiting instantaneous spectrum opportunities is one of the central technological underpinnings. This research develops algorithms and protocols for opportunistic spectrum access under energy and hardware constraints. The main scientific ideas being developed include (i) cognitive sensing and access strategies that learn from observations and offer improved performance over time, (ii) distributed protocol implementations in ad hoc networks without central controllers or dedicated communication/control channels, (iii) quantitative characterizations of the trade-off among optimality, complexity, and robustness of opportunistic spectrum access strategies. This research contributes to the advance of network science. It provides technical data for the assessment of the potentials of opportunistic spectrum access. Specific research topics arising from this project provide educational and research opportunities for undergraduate and graduate students.