Reconfigurable Antenna-based Enhancement of Dynamic Spectrum Access Algorithms

虽然在认知无线电的算法和协议方面有大量的研究，但很少有人关注在认知链路中使用的天线。本项目侧重于利用电可重构天线增强认知动态频谱接入（DSA）技术，该技术能够根据覆盖通信链路和网络的需要动态调整其辐射模式和工作频率。根据现场测试结果，新的可重构天线正在设计中，不仅提供了辐射方向图的灵活性，而且提供了频率敏捷性。十字架的设计和性能？对层控制堆栈进行评估，以确定寻求最大吞吐量的二次无线电的最优控制策略。在芬兰合作者的额外支持下，Drexel SDC测试平台正在进行扩展，以提供所提议的增强型DSA算法的实时实现。这项研究是通过德雷塞尔大学开发的可重构漏波超材料天线技术实现的。该天线的高度自适应频率敏捷性和空间滤波能力将用于开发新的DSA算法，以利用这些自由度。增强的性能将体现在认知无线电网络的用户容量和次级认知无线电用户吞吐量的增加方面。这些天线和控制算法将使用基于fgpa的SDR平台进行现场测试和演示，该平台旨在评估可重构天线增强的DSA算法。

While there is a tremendous amount of research in the algorithmic and protocol aspects of cognitive radios, very little attention is given to the antennas used in cognitive links. This project focuses on the enhancement of cognitive dynamic spectrum access (DSA) techniques with electrically reconfigurable antennas that are capable of dynamically adjusting their radiation patterns and operating frequency in response to the needs of overlying communication link and network. Based upon the results of field testing, new reconfigurable antennas are being designed that provide not only flexibility in radiation pattern, but also frequency agility. The design and performance of the cross?layer control stack is being evaluated for identification of the optimal control policy for secondary radios seeking to maximize their throughput. With the additional support of our collaborators in Finland, the Drexel SDC Testbed is being extended to provide real-time implementations of the proposed enhanced DSA algorithms.This research is enabled through the reconfigurable leaky wave metamaterial antenna technology, developed at Drexel University. The highly adaptive frequency agility and spatial filtering capabilities of this antenna will be used to develop new DSA algorithms to leverage these degrees of freedom. Enhanced performance will be demonstrated in terms of the user capacity of the cognitive radio network and increased throughput of secondary cognitive radio users. These antennas and control algorithms will be field tested and demonstrated using a FGPA-based SDR platform built to evaluate reconfigurable antenna-enhanced DSA algorithms.