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The issues of carrier frequency offset (CFO) and channel estimation are very important for multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) wireless communication systems. In this paper, the problems of CFO and channel estimation are considered. An adaptive estimation algorithm is proposed. It can estimate CFO and channel parameters at the same time. Since the estimation...
As social media services (e.g. Wikipedia, Facebook, Twitter, Linkedin, and so on) become more and more popular, it is of greater research interest to raise the efficiency of using Sentiment Analysis to predict future opinion trends. Based on the naïve Bayes classifier, this research proposes a novel emotion classifier, CCLM (Combined CKIP Language Model), to enhance the precision of opinion classification...
This work presents a data-intensive solution topredict heating and hot water consumption. The ability topredict locally those flexible sources considering meteorologicaluncertainty can play a key role in the management of microgrid. A microgrid is a building block of future smart grid, it canbe defined as a network of low voltage power generating units, storage devices and loads. The main novelties...
The fast expansion of Internet-based multimedia services like Netflix, Skype or YouTube -- the so-called Over-The-Top Services (OTT) -- have increased the quality requirements of these services from the point of view of the user. In this sense, it is important not only to ensure a good Quality of Service (QoS) level -- technical metrics -- but also a high level of Quality of Experience (QoE) -- subjective,...
Cognitive radio (CR) technology plays a major rolein managing the spectrum resources and allocating themaccording to the requirements of the users. Few recent worksfocused on the problem of routing in cognitive networks. Werecommend an adaptation of on-demand routing since itsperformance has been proven to CRAHNs (Cognitive RadioAd Hoc Networks). As an example, we can find the CognitiveAd hoc On demand...
The Wireless Sensor Networks (WSN) have distributed and embedded nature and they are characterized by strong interactions between their hardware and software parts, therefore, their specification is a complex task. Formal methods need strong skills in mathematics in order to model and analyze WSN applications. However, semi-formal methods are simple and easy to understand. Hence, most of approaches...
An ever-growing number of network connected devices per user and changing usage preferences in current networks require novel monitoring techniques be put in place by operators to identify and, if possible, predict user requirements and behaviour. This study utilises NetFlow and cluster analysis to derive six unique traffic profiles namely, 'communicators', 'concealers', 'downloaders', 'all-rounders'...
Because of the recent advances in wireless technologies and, consequently the fast growing number of wireless devices that are being deployed in consumer houses, there is a growing demand from manufacturers to develop and deploy tools able to diagnose problems and evaluate the performance of their products prior to releasing them to the market. Such testing tools are required to be quickly deployable...
The smart grid (SG) is widely acknowledged asthe new solution to be developed to handle distributed network fighting against the increase of renewable energy. Wireless Sensor Networks (WSNs) have been extensively recognized as a promising technology that can improve various aspects of electrical models today as smart grid. Hence, WSNs are well suited for applications based on this type of communication...
In last decade, LEDs are popularly employed in our daily life due to its own characteristics. As LEDs have many advantages such as high tolerance to humidity, long usage lifetime, and low power consumption, it has been employed in our daily life in various ways, (car lamps and lights in vehicles, roadside signal lights, indoor lighting systems, etc.). Moreover, LEDs can also be employed for wireless...
The paper presents an analytical model to study the performance and availability of queueing systems with finite queue and two service phases. The first phase has the exponential distribution of service time, while the second one has the hyperexponential distribution. The analytical results obtained are verified using discrete-event simulation. A few numerical examples for varying the service rates...
The increased computation and storage capabilities of smartphones have attracted more and more cybercriminals to write mobile malware for different purposes. Due to the popularity of smartphones in both personal life and business, it is empowering an emerging mobile security threat issue. In this paper, we present an intrusion detection system that incorporates not only network features but also host-based...
Privilege escalation attack is one of the serious threats to Linux. So the protection of the root user is an important requirement for Linux systems and SELinux has tackled this issue in some degree. But by exploiting kernel privilege-escalation vulnerabilities, the attackers can tamper security identifiers allocated for the process's security contexts, which are the foundation of SELinux enforcing...
A Mobile Ad hoc Network (MANET) consists of a group of mobile nodes that can move abruptly in and out the network. MANET has several special specifications including, non-fixed infrastructure, the absence of a central administration, limited bandwidth, and limited energy. Merging two MANETs is a situation that can occur frequently because of mobility. Due to the nature of MANET, it is vulnerable to...
The BSS (Business Support Systems) has played a critical role in strictly competition telecom market. They constantly face stringent challenges such as quality assurance as well as time to market and budget. The test case design is an important step and a higher cost in system quality assurance phase. However by knowledge few test data correlation based approach has some drawbacks such as the coverage...
This paper studies the performance of a wireless sensor network (WSN) with cognitive radio (CR) capabilities to gather information about structural health monitoring (SHM) of buildings in case of seismic activity. The system performance is evaluated in terms of average packet delay and average energy consumption. In order to efficiently use the resources of the network and considering that the WSN...
Greedy routing is an appealing routing mechanism, which does not require to build and maintain routing tables. Although, it requires a specific geometric coordinate assignment for underlying network nodes. Such a coordinate assignment is called a greedy embedding, where messages are routed over a distance decreasing path from the source to the destination. Despite various research on computation of...
Micro-grids allow rural and remote communitiesthat are either not connected to the national power grid, or sufferfrom load shedding, to operate power networks autonomously. Like conventional power networks, micro-grids require management and billing mechanisms. Tamper-resistant meters are noteconomically viable so we use a resource-constrained networkformed of devices with limited memory, processing...
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