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Long Term Evolution (LTE), the next-generation network beyond 3G, is designed to support the explosion in demand for bandwidth-hungry multimedia services that are already experienced in wired networks. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers functionality to transmit MBMS over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted...
Shannon's paper in 1948 has enticed researchers to explore the capacity of networks. Roughly two decades later, van der Meulen introduced relay channels and Cover introduced the idea of broadcasting and taking advantage of spatial diversity. Since then, numerous researchers have placed their focuses on different aspects of peer-to-peer networks. This paper covers three different bounds that deal with...
In order to construct a radio environmental map that can help navigating secondary communication in TV bands, we present a new method of interference source localization for cognitive radio networks. Our low-cost, high-precision localization method, operates without any prior knowledge of the interference source other than transmitter power. It can be divided into two steps: an estimation step at...
We study in the present paper the spectral efficiency of OFDMA cellular networks which is a classical indicator of their performance usually calculated by simulations. On the other hand, due to an increasing interest on the environmental impact of these networks, we study also their energy efficiency which may be defined as the ratio of the spectral efficiency and the consumed energy. We give an explicit...
This paper studies Wireless Information-Theoretic Security for low-speed mobility in autonomic networks. More specifically, the impact of user movement on the Probability of Non-Zero Secrecy Capacity and Outage Secrecy Capacity for different channel conditions has been investigated. This is accomplished by establishing a link between different user locations and the boundaries of information-theoretic...
To minimize interference with primary users, one of the major concerns in cognitive radio is to determine the allowable transmission power. This paper addresses the problem of power management to insure on one hand, no interference with primary user and on the other hand, the requested QoS (Quality of Service) level to the secondary transmitter. In this paper we propose a two steps method to determine...
In the Cognitive Radio (CR) framework, the Opportunistic Spectrum Access (OSA) is a promising solution to increase spectral efficiency. However in an OSA network secondary unlicensed cognitive nodes have to agree on which spectral resources they are allowed to use without compromising performance of primary licensed users. This requires a common control channel for sharing spectrum sensing information...
In cellular systems, BSs (base stations) are ideally desired to be located in the center of cells, but it is sometimes impossible because of the physical and/or social restrictions on the BS setting space. This paper considers the influence of the displacement of the BS location on BS cooperation (BSC) scheme in MIMO (multiple input multiple output) cellular system. For this aim, BS locations are...
In this paper we propose a novel multicarrier (MC) architecture to address the energy saving problem in WLAN applications. We refer to this scheme as hybrid filtered multitone (H-FMT). Depending on the channel condition, H-FMT wisely switches between Filtered Multitone Modulation (FMT) with orthogonal pulses and adaptive orthogonal frequency division multiplexing (A-OFDM). We show that H-FMT provides...
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