Enabling multiband cognitive relay networks

认知无线电（CR）是一种新兴的技术，能够解决频谱稀缺，面临着全球频谱管理机构。CR的目标是提高资源利用效率，同时增强通信的可靠性。这些目标是通过允许CR以机会主义方式对许可频带进行辅助接入来实现的，使得许可用户（也称为主用户（PU））不会受到有害干扰。多频带认知无线电（MBCR）具有对一组频带进行检测和分类的能力，可以利用每一个可用的机会来提高通信的可靠性和频谱利用率。该研究计划将研究用于同时检测和利用一组空闲频谱的创新技术和算法，从而为CR提供额外的自由度（与经典的单波段认知无线电（SBCR）相比）。该计划的主要目标是解决所面临的挑战，实现MBCR和建立一个框架，有效的设计MBCR合作中继网络。我将研究新的MBCR方案的协作中继网络的背景下，并提供了一个深入的分析，分析和仿真的性能。自适应调制也将被探索作为一个额外的强大的工具，提高MBCR中继网络的功率和频谱效率。

Cognitive Radio (CR) is an emerging technology capable of solving spectrum scarcity that faces spectrum regulation agencies worldwide. CR aims at improving resource utilization efficiency as well as enhancing the communication reliability. These goals are achieved through allowing secondary access by CRs to licensed spectrum bands in an opportunistic manner such that licensed users (also known as Primary Users (PU)) experience no harmful interference. Multiband cognitive radio (MBCR) has the inherent capabilities of detecting and classifying a group of spectrum bands, allowing the CR to exploit every available chance to enhance communication reliability as well as improving the spectrum utilization efficiency. This research program will investigate innovative techniques and algorithms for simultaneous detection and utilization of a group of idle spectrum bands, hence providing the CR with additional degrees of freedom (compared to the classical Single Band Cognitive Radio (SBCR)). The main goal of this program is to address the challenges facing the realization of MBCR and establish a framework for efficient design of MBCR over cooperative relay networks. I will investigate new MBCR schemes in the context of cooperative relay networks and provide an in-depth analysis for their performance both analytically and by simulation. Adaptive modulation will also be explored as an additional powerful tool for enhancing power and spectral efficiency in MBCR relay networks.