In this paper, we study the cooperative communications where multiple cognitive radio (CR) transmit-receive pairs competitive maximize their own throughputs. In CR networks, the influences of primary users and the spectrum availability are usually different among CR users. Due to the existence of multiple relay nodes and the different spectrum availability, each CR transmit-receive pair should ...

Currently, most Software Defined Radio (SDR) related products and researches focus on analog communication and voice transmission. In this paper, we propose a SDR platform with digital data communication capability. This platform consists of Field Programmable Gate Array (FPGA) based radio hardware and open source SDR software modules. The main features include: 1) Radio Spectrum Sensing; 2) Re...

With the intent of efficient occupying under-utilized spectrum, radio environment map (REM) based cognitive radio (CR) networking is proposed to facilitate the distributed spectrum sensing. Although the operational aspects of REM-enabled CR network are being studied actively, its security aspects have attracted very little attention. In this paper, we identify the security threats and propose g...

Abstract Cognitive radio (CR) allows the best use of dynamic access to spectrum and wide diversity mitigate depletion issues fulfil huge wireless networking requirements. This paper also illustrates, discusses, focuses on some essential applications, a proactive sharing strategy using full-duplex (FD) in cooperative Radio Networks (CRN).

Radio spectrum is a scarce and precious natural resource that is significantly underutilized with current fixed spectrum-licensing policies [1]. This has inspired the development of hierarchical spectrum-sharing systems, where secondary systems are allowed to access the underutilized spectrum of incumbents without causing harmful interference to legacy/primary systems. In this article, we are i...

Wireless data communications, especially to and from portable mobile devices, is one of the fastest growing paradigms in the field of computer communications. This fast paced growth of wireless communication devices is making some communication frequency bands overcrowded. There exists legacy frequency spectrum that remains under utilized. As a result, there are great inefficiencies in how the ...

Nowadays the demand of the wireless application has grown from day to day life. The Demand of wireless applications has put a many of constraints on the use of available radio spectrum which is a limited and precious resource. The static spectrum assignment leads to underutilization of the spectrum as a great portion of the licensed spectrum is not efficiently utilized. Cognitive radio (CR) is ...

With the rapid growth in wireless communication, the available spectrum is being congested day by day. For the efficient utilization of the limited spectra, Cognitive Radio System (CRS) plays an important role that has ability to dynamically adapt its parameters and protocols as per the surrounding environment and from its past experiences. Grounded on Software-Defined Radio (SDR) technology, i...

Cognitive radio (CR) is considered as a key enabling technology for dynamic spectrum access to improve spectrum efficiency. Although the CR concept was invented with the core idea of realizing “cognition”, the research on measuring CR cognitive capabilities and intelligence is largely open. Deriving the intelligence measure of CR not only can lead to the development of new CR technologies, but ...

With the increasing emergence of new wireless systems and the explosive development of mobile internet applications, the demands on Radio Frequency spectrum have been constantly increasing, and therefore, the related demands for bandwidth, wireless communication technology is facing a potentially scarcity of radio spectrum resources. However, spectrum measurement campaigns have shown that the s...