. The term xG networks is used throughout the paper. The novel functionalities and current research challenges of the xG networks are explained in detail. More specifically, a brief overview of the cognitive radio technology is provided and the xG network architecture is introduced. Moreover, the xG network

Cognitive radio is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. The cognitive radio, built on a software-defined radio, is defined as an intelligent wireless communication system that is aware of its environment

Advances in processor, memory and radio technology will enable small and cheap nodes capable of sensing, communication and computation. Networks of such nodes can coordinate to perform distributed sensing of environmental phenomena. In this paper, we explore the directed diffusion paradigm

This paper provides an overview of sotSare radio and its current state in the industry. SotSare radio is a technology in which all of the waveform processing, including the physical layer, of a wireless device moves into sot'tware. If designed properly, this approach leads to dramatically

Advances in processor, memory and radio technology will enable small and cheap nodes capable of sensing, communication and computation. Networks of such nodes can coordinate to perform distributed sensing of environmental phenomena. In this paper, we explore the directed diffusion paradigm

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Abstract—The growing use of Wireless Sensor Networks (WSNs) to accomplish tasks with strict requirements in terms of secrecy and reliability is increasingly attracting the interest of malicious users, thus incrementing the demand for more secure and dependable WSN implementations. Such necessity is directly reflected in the growing need for tools and techniques to ease the design, assessment and validation of security solutions suited for WSN deployments. Initially, WSNs were mainly considered as stand-alone systems but the emerging Internet of Things (IoT) vision is fostering a deeper integration of WSNs as a part of the Internet, hence making holistic approaches and re-use of existing solutions more effective also concerning security. In order to cope with this evolving scenario, this paper proposes a tool to support penetration testing of actual WSN deployments based on the 6LoWPAN family of protocols, considered one of the main building blocks of the IoT paradigm. The feasibility of WSN penetration testing as an approach to tackle IoT security is demonstrated through a practical proof-of-concept developed by extending the well-known Metasploit Framework targeting actual WSN deployments based on 6LoWPAN. I.

We study the problem of media access control in the novel regime of sensor networks, where unique application behavior and tight constraints in computation power, storage, energy resources, and radio technology have shaped this design space to be very different from that found in traditional mobile

Abstract—Attractive features of time-hopping spread-spectrum multiple-access systems employing impulse signal technology are outlined, and emerging design issues are described. Performance of such communications systems in terms of achievable transmission rate and multiple-access capability

Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks