In this chapter, the concepts of Cognitive Radio (CR) and multi-dimensional spectrum sensing are introduced. Spectrum sensing methodologies, energy efficiency consideration, resources scheduling, and self-management and learning mechanisms in cognitive radio networks are also discussed. The entailed challenges of CR RF front-end architectures are looked into. The synthesis and design performanc...

Current spectrum resources are lack due to inflexible spectrum sharing regulations and underutilization of licensed band for primary users (PUs). Cognitive radio (CR) technology is proposed to address this problem. CR technology enables secondary users (SUs) access temporally unused licensed spectrum in opportunistic manner. Benefit from high spectrum efficiency, CR technology has been widely u...

Spectrum sensing is the basic and essential mechanisms of Cognitive Radio (CR) to find the unused spectrum. This paper presents an overview of CR architecture, discusses the characteristics and benefits of a CR. Energy detectionbased spectrum sensing has beenproposed and used widely because it doesn’t require transmitted signal properties, channel information, or even the type of modulation. In...

Wireless communication (WC), Radio environment (RF) emerges a cognitive radio scheme. It is an intelligent wireless communication system that has more awareness about surrounding environment; depending upon the environment it will give flexible communication as well as effective reuse of the unused available spectrum. Recent Research says 70% of the radio frequency spectrum is not used effectiv...

In this paper; we introduce novel technique in which effective communication of the Smartphone can be achieved. It is used as a platform to investigate a correlation that exists between securing the Smartphone and efficient emergency communication. We conducted to include several radio technologies, such as cognitive radio (CR). Cognitive radio deals with spectrum resources utilization. Due to ...

Radio spectrum is limited like all natural resources, and is required to be used with improved spectral efficiency. One proposed solution is to allow unlicensed users to share underutilized licensed bands with its primary users (PU’s) without disturbing their communication. Cognitive Radio (CR) technology is the key enabling feature of this solution. CR technology enables the wireless nodes to ...

Cognitive radio (CR) is a promising technology which avoids congestion in wireless communication by exploiting unused radio spectrum. The Spectrum sensing (SS) plays a fundamental requirement of CR which finds an unused free spectrum and detects the licensed user transmissions. This paper constitutes the study about the classification of spectrum sensing in energy detection, cyclostationary, ma...

The aim of this study is to introduce a conceptual framework for the new approach Intelligent Proactive Pre-emptive Unified Spectrum Handoff (IP PRO-PUSH) algorithm is presented, which is a highly potential intelligent technology to intelligently address the spectrum scarcity challenges in Cognitive Radio Mobile Ad hoc Networks (CR-MANETs). The fact that spectrum is a limited natural resource p...

In this paper a framework is presented based on 4G Cognitive Radio (CR) network capable of communicating with high numbers of geographically dispersed smart meters for command and control feature concurrently with private cellular network. Our approach uses pervasive smart grid systems (i.e. cloud data centers) as the central communication and optimization infrastructure supporting metropolitan...

Cognitive Radio (CR) technology is introduced to solve the problem of spectrum usage inefficiency of wireless networks. CR technology allows sharing of licensed spectrum band in opportunistic and non interfering manner. However it should be aware of spectrum availability and Primary User (PU) activities. Routing and spectrum management are the main challenges in Cognitive Radio Network. Here ro...