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While many theoretical and simulation works have already highlighted the potential gain of cognitive radio, several technical issues still have to be evaluated and overcome from an experimental viewpoint. Our team is currently developing a new experimental facility remotely accessible and dedicated to this problem. CorteXlab is developed in the framework of a nationwide French program Future Internet...
The demand for mobile computing services has grown significantly and rapidly in the last few years. This has led to a serious challenge on the quality of experience for mobile users. The wireless network consists of consumer devices that communicate simultaneously on a shared and severely-limited spectrum. In 2010, the Federal Communication Commission (FCC) has unleashed 500MHz of newly available...
This paper presents the general distribution for the distance between a mobile user and any base station (BS). We show that a random variable proportional to the distance squared is Gamma distributed. In the case of the nearest BS, it can be reduced to the well established result of the distance being Rayleigh distributed. We validate our results using a random node simulation and real Vodafone 3G...
With the increasing demand for local traffic load, the technique of Device-to-Device (D2D) communication has received great attention [1]. Using the same spectrum as that in cellular communication, D2D communications can increase the overall network spectral efficiency. Meanwhile, D2D communications can potentially generate interference into the existing cellular network if the radio resources are...
Developing an efficient spectrum access policy enables cognitive radios to dramatically increase spectrum utilization while assuring predetermined quality of service levels for the primary users. In this abstract, modeling, performance evaluation, and optimization of a distributed secondary network with random sensing order policy are studied. Specifically, the secondary users create a random order...
We propose a novel information market for TV white space networks, where white space databases sell the information regarding the TV channel quality to unlicensed white space devices (WSDs). Different from the traditional spectrum market, the information market demonstrates the positive network externality, as more WSDs purchasing the information from a database will increase the value of the database's...
Interference management is an important subject in Device to Device (D2D) communication when underlying a LTE-A cellular band. By default, in LTE-A there is negligible intra-cell interference due to the orthogonality of the subcarriers but this orthogonality will be lost when D2D communication takes place under cellular users (CU). Therefore, the purpose of this paper is to propose a novel scenario...
Interference alignment (IA) is a promising technique for interference management in cognitive radio (CR) networks. However, the sum rate may fall short of the theoretical maximum especially at low signal-to-noise ratio (SNR). Moreover, in most of the previous works, energy efficiency (EE) aspect is largely ignored. In this paper, energy-efficient power allocation (PA) and transmission-mode adaptation...
The objective of a wireless multiaccess communication system is to distribute limited wireless channel resources efficiently and fairly among its users. Solutions for multiaccess communications have been approached with very different perspectives of the same problem, among them information-theoretic approaches at the physical layer, random access at the media access layer, and packet scheduling at...
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