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A closed-form approximate expression for the average bit error probability (ABEP) of multi-hop multi-branch cooperative networks is derived. The cooperative amplify-and-forward (AF) relaying scheme includes M separate branches between the source node and the destination node, and each branch comprises a certain number of relays. Furthermore, we consider independent and non-identical Rayleigh fading...
For wireless ad hoc networks with nodes having limited battery capacity, we propose route selection based on maximizing the minimum node battery power and minimizing the total transmission power required to reach the destination. The lifetime of the selected routes should also be long enough to sustain the data transmission, if possible. This motivates the design of a Location-Aided Power and Mobility...
Long Term Evolution (LTE) provides a new radio technology that allows operators to achieve even higher peak throughputs than HSPA+. One of the LTE system performance optimization point is the PDCP buffer management mainly in the downlink. Per bearer PDCP buffers at eNodeB (eNB) hold DL data before it is transmitted over radio interface. This buffered data also contributes towards X2 traffic volume...
Many wireless protocols (including 802.11 definitions) consider fragmentation a valuable approach to minimise the number of transmissions which are lost due to errors. Deciding the optimum size of the fragments is a problem that has been deeply studied in literature. In this paper we consider a different perspective: we propose a Markovian queueing model capable of predicting important performance...
In this paper, a Differentiated Services (DiffServ) architecture for Quality of Service (QoS) provisioning in Wireless Multimedia Sensor Networks (WMSNs) is presented. The proposed architecture differentiates critical real-time data from real-time multimedia data by defining six traffic classes along with their forwarding behaviour. Since Wireless Sensor Networks (WSNs) are application-specific, DiffServ...
Deployment of femtocells with open or hybrid access into mobile networks leads to problems with handling handover of mobile users. In this paper we discuss two important aspects that can be considered and exploited in a design of innovative handover procedure for scenario with femtocells. The first aspect is related to varying quality and limited capacity of femtocell's backbone. Further, an accuracy...
This paper proposes a method that takes into account the diversity and requirements of multimedia traffic for evaluating blocking probabilities in multiservice wireless networks. For performance evaluation, we analyze the impact of traffic intensity on the blocking probability of each class of services, and compare the results obtained from simulation with those obtained numerically using the proposed...
With the advent of 4G wireless systems, we face the exceedingly difficult task of modeling them. For the relevant technologies, such as LTE-advanced, both connection- and packet-level activities have to be modeled concurrently. Such systems support a variety of transport services. The difficulty of the modeling exercise is compounded by the dynamic mobile nature of such systems and its users, and...
The current generation of mobile terminals can communicate on multiple modes using several antennas. However, their energy consumption remains a critical parameter. In this paper, we explore the combination of multiple communication modes and MIMO as a possible way to reduce the energy consumption of both the terminals and the network. We propose a realistic energy model for the PHY layer of a MIMO...
This paper addresses the problem of wireless resource allocation in OFDMA-based cognitive radio cooperative systems. The objective is maximizing the total throughput and minimizing the transmission power of cognitive transmissions while guaranteeing fairness between the different cognitive users queues. The proposed radio resource allocation algorithm is based on maximizing the rate to power ratio...
Routing in opportunistic networks heavily relies on past behavior of the mobile devices it is formed of to predict their future and thus making routing decisions. While almost every protocol relies on this history, its prediction quality has never been studied in a realistic setting. Using extensive simulations on real traces, we are able to describe for the first time how well predictions can be...
Micaz motes can communicate on multiple frequencies as specified in the 802.15.4 standard. This reality has given birth to multichannel communication paradigm in Wireless Sensor Networks (WSNs). Obviously, multichannel communication mitigates interferences, jamming and congestion, whereas it brings also challenging issues. Thus, in this paper, we are motivated to draw a picture of multichannel assignment...
Mobile phones are offering a wide set of functionalities capable of improving the user way of communicating with the world. Due to user mobility and to the inherent ubiquity of these devices, social relations are now being created and maintained using mobile social applications. To this aim, in this work, we present our application Nudge Nudge, a proximity based social application which aims to connect...
Protocols for opportunistic networks have until this point focused primarily on overcoming the partitioning of those networks. However, emerging studies show that opportunistic networks also exhibit considerable clustering. Neither current store-carry-forward protocols nor path-based protocols are equipped to effectively handle both of these network characteristics. In response, we present the design...
This paper analyze the interference between Fixed Satellite Service (FSS) and Broadband Wireless Access (BWA) in the extended C-band. The paper is initiated with comparison with previous reports from telecommunication bodies. Detailed calculation on path loss effects, angle of interference and important parameters for FSS and BWA are analyzed to obtain a good account of the interference occurrence...
Location-aided routing (LAR) is a mechanism which attempts to reduce the control message overhead of Ad-hoc on-demand distance vector (AODV) routing protocol by flooding only the portion of the network that is likely to contain the route to destination. LAR takes advantage of Global Positioning System (GPS) coordinates to identify a possible location of the destination node. Based on this information,...
The term “Dense networks” is usually used to identify networks having large number of nodes within a small area while affecting network performance. Starting from this concept, different networking solutions were proposed. However, it seems to us that this view is very abstract and needs to be further investigated. Knowing the network density level can be of great importance in determining the network...
The MMSE-DFE is a well established Intersymbol Interference (ISI) mitigating structure on linear, noisy, and dispersive channels. Time invariant communication channels exhibits ISI for severe frequency-selective channels. In this paper we investigate the iterative decoding with imperfect MMSE decision feedback equalizer using different modulation scheme. We assume that soft outputs from channel decoder...
Recently there has been a huge demand of Wireless Sensor Network (WSN) applications. A basic requirement of these applications is localization. Traditionally, nodes do not have any prior knowledge of their position when deployed. Thus a mechanism is required for nodes to determine their position. In this paper a new Time of Flight (TOF)-based ranging technique is presented which minimizes the errors...
Sensor-enabled smartphone's are becoming a mainstream platform for researchers to collect data which could prove useful for discovering patterns in human behavior. Yet, employing sensorial data to extrapolate information is not clear and deserves investigation. In this article, we discuss movement pattern recognition in day-by-day urban street behavior. As a case study, we aim at recognizing when...
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