Cognitive Radio Networking and Communications: An Overview
Cognitive Radio Networking and Communications: An Overview
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DOI：
10.1109/tvt.2011.2158673
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发表时间：
2011-09-01
影响因子：
6.8
通讯作者：
Maehoenen, Petri
中科院分区：
文献类型：
--
作者：
Liang, Ying-Chang;Chen, Kwang-Cheng;Maehoenen, Petri
认知无线电（CR）是支持动态频谱接入的使能技术：解决许多国家遇到的频谱稀缺问题的政策。因此，CR被广泛认为是未来无线通信中最有前途的技术之一。然而，要使无线电和无线网络真正具有认知性，绝非一项简单的任务，它需要来自各种研究团体的合作努力，包括通信理论，网络工程，信号处理，博弈论，软硬件联合设计以及可重构天线和射频设计。在本文中，我们提供了一个系统的概述CR网络和通信的物理（PHY），介质访问控制（MAC），并在CR设计中涉及的网络层的关键功能，以及这些层是如何交叉相关。特别是，对于物理层，我们将解决信号处理技术的频谱感测，合作频谱感测，和收发器设计的认知频谱接入。对于MAC层，我们回顾了感知调度方案，感知接入权衡设计，频谱感知接入MAC，和CR MAC协议。在网络层，认知无线电网络（CRN）的断层扫描，频谱感知路由和服务质量（QoS）控制将被解决。还将审查由各种标准化委员会和频谱共享经济积极开发的新兴CRN。最后，我们指出了几个开放的问题和挑战，与CRN的设计。
Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access: the policy that addresses the spectrum scarcity problem that is encountered in many countries. Thus, CR is widely regarded as one of the most promising technologies for future wireless communications. To make radios and wireless networks truly cognitive, however, is by no means a simple task, and it requires collaborative effort from various research communities, including communications theory, networking engineering, signal processing, game theory, software-hardware joint design, and reconfigurable antenna and radio-frequency design. In this paper, we provide a systematic overview on CR networking and communications by looking at the key functions of the physical (PHY), medium access control (MAC), and network layers involved in a CR design and how these layers are crossly related. In particular, for the PHY layer, we will address signal processing techniques for spectrum sensing, cooperative spectrum sensing, and transceiver design for cognitive spectrum access. For the MAC layer, we review sensing scheduling schemes, sensing-access tradeoff design, spectrum-aware access MAC, and CR MAC protocols. In the network layer, cognitive radio network (CRN) tomography, spectrum-aware routing, and quality-of-service (QoS) control will be addressed. Emerging CRNs that are actively developed by various standardization committees and spectrum-sharing economics will also be reviewed. Finally, we point out several open questions and challenges that are related to the CRN design.