NeTS-ProWiN: Research and Test of Non-Intrusive Wireless Networks for Opportunistic Spectrum Utilization

本项目研究频谱敏捷通信网络中的非侵入性机会接入。这项工作受到有效利用频谱需求的推动，受到监管政策变动的促进，并受到硬件技术进步的支持。研究人员将重点放在基于传感的二级网络上，以实现非侵入性，因为基于传感的方案需要较少的基础设施支持，并且可以补充其他方法。本文主要研究了以下问题：1)主从用户的容量干扰权衡；2)在主用户返回时疏散二级用户；3)与基于csma的主用户的兼容性。该项目包括理论分析、系统建模、协议设计和实验评估。采用一种涵盖物理层、MAC层和网络层的集成方法，从理论到实践进行跨越。研究人员利用估计和检测、图形和优化理论的工具进行分析和建模，并设计实验进行性能评估和模型验证。该项目的结果包括基于传感的方法的可行性和能力分析，包括非交互式（例如基于TDM/ cdm的）和交互式（例如基于csma的）初级系统；基于主用户的干扰容忍极限，快速可靠地疏散辅助用户的协议套件。该项目的成果将为研究界提供对非侵入性频谱敏捷通信系统的良好理解，并为政策制定者提供理论限制和实验数据。在这个项目中开发和验证的协议和模型可以被其他研究人员用作频谱敏捷系统的构建块。该项目还加强了教育课程，促进了跨学科的合作。

This project studies non-intrusive opportunistic access in spectrum-agile communication networks. This work is motivated by the need for efficient spectrum utilization, facilitated by regulatory policy movements, and enabled by advances in hardware technologies. The investigators focus on sensing-based secondary networks to achieve non-intrusiveness because sensing-based schemes require low infrastructure support and can complement other approaches. The following issues are studied: 1) capacity-interference tradeoff between primary and secondary users; 2) evacuation of secondary users upon the return of primary users; and 3) compatibility with CSMA-based primary users. The project involves theoretical analysis, system modeling, protocol design, and experimental evaluation. An integrated approach is taken that involves physical layer, MAC layer, and network layer and spans from theory to practice. The investigators exploit tools from estimation and detection, graph, and optimization theories for analysis and modeling, and design experiments for performance evaluation and model validation. The results of the project include feasibility and capacity analysis of sensing-based approach, including both non-interactive (e.g., TDM/CDM-based) and interactive (e.g., CSMA-based) primary systems; and protocol suites that evacuate secondary users fast and reliably based on the interference tolerance limit of primary users. The outcome of this project will provide the research community with good understandings on non-intrusive spectrum-agile communication systems and policy makers with theoretical limits and experimental data. Protocols and models developed and validated in this project can be used by other researchers as building blocks of spectrum-agile systems. The project also enhances the education curriculum and fosters the interdisciplinary collaborations.