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Cognitive Radio (CR) has been recognized as a promising solution to solve the current spectrum inefficiency problem. We consider a CR Base Station (CR-BS) has multiple spectrum bands over a wide frequency range and uses channel-dependent data rates to ...

In this paper we present the FPGA implementation of a multi-antenna Orthogonal Frequency-Division Multiplexing (OFDM) transmitter and receiver featuring a closed-loop (CL) communication scheme. The PHY-layer development follows the specifications of the ...

The development of services that use context data to personalize their behaviour is complex. Data coming from distributed and heterogeneous sources have to be acquired, processed and managed. One of the main tasks in the development process is the ...

Partial transmit sequences (PTS) is an efficient technique to reduce the peak-to-average power ratio (PAPR) for orthogonal frequency division multiplexing (OFDM) systems. One main drawback of the conventional PTS method is the need of side information. ...

In this study, the effect of pilot arrangement on OFDM system performance for different time and frequency selective fading channels is investigated. Pilot symbols are placed in rectangular 2-D pilot pattern in chosen intervals both in time and ...

Mitigation of inter-carrier (ICI) and inter-symbol interference (ISI) in the systems based on Orthogonal Frequency Division Multiplexing (OFDM) has been a popular research topic already for several decades. Utilisation of signal bases with ameliorated ...

In this paper, we propose a cooperative traffic transmission algorithm in a joint cellular and mobile ad hoc hybrid network architecture. The mobile ad hoc network is based on IEEE 802.11p standard. The focus of this paper is on defining an algorithm ...

This paper presents the Self Adapting Receiver Initiated MAC protocol (SARI-MAC), a novel asynchronous MAC protocol for energy constrained Wireless Sensor Networks. SARI-MAC self-adapts to the traffic load to meet specified Quality of Service ...

This paper describes the iTrust over SMS decentralized search and retrieval system for mobile networks. Any mobile device in the iTrust network can communicate with any other mobile device in the iTrust network to distribute, search for, and retrieve ...

In recent years, new business and research opportunities have been increasingly emerging in the field of large-scale context-aware pervasive systems (e.g. pervasive health-care, city traffic monitoring, environmental monitoring, smart grids). These ...

Inter-vehicle communication is considered as a major problem to vehicular environment. Here, an analytical framework is developed to investigate the reliability of end-to-end information relay process along a platoon of vehicles. The reliability of ...

In vehicular ad hoc networks (VANETs) tracking of participants is an issue that is examined by many research groups. These groups came up with several different concepts of counter measures against tracking attacks. All of these presented techniques ...

In this paper, we propose a modification of the observe extension of CoAP to include Quality of Service (QoS) support for timeliness. The proposed QoS support is based on delivery priority. Nodes are able to express the priority order with which they ...

This paper presents a novel ‘Energy Efficient Tracking’ (EET) algorithm that tries to meet the localization accuracy requirement, Pa, imposed by a generic location-based application while the energy consumption for ranging and communication is ...

Transporting raw data which is usually correlated over multi-hop wireless links can be costly both in terms of time as well as resources. This is likely to be a pressing problem particularly in the emerging Machine-to-Machine (M2M) communication ...

In wireless sensors networks (WSNs) the efficient use of the sensors' energy is a key point to extend the network lifetime and has been the center of attention by many researchers. There are several different techniques to reduce the sensor's energy ...

In wireless smart metering optimization for energy efficiency is indispensable, because in case of systems without external power supply, battery life is a key factor regarding the usability of the whole system. Sensor networks are less sensitive for ...

In wireless sensor networks connected dominating sets are often used to form a virtual backbone. However, a connected dominating set is often vulnerable due to frequent node failures in sensor networks. Hence, to provide a degree of fault-tolerance, we ...

In this paper, we investigate lattice network codes (LNCs) constructed from lattices over the ring of Eisenstein integers. Quantization and encoding algorithms over Eisenstein integers are first introduced. Then, a union bound estimation (UBE) of the ...

Wireless Sensor Networks are vulnerable to quite a good deal of logical and physical security attacks. However, providing security countermeasures for every possible attack is practically unfeasible for cost and performance reasons. Thus, it is vital to ...

For the two-user interference channel, the Han- Kobayashi (HK) scheme is known to achieve optimal rates within one bit of the capacity for Gaussian codebooks. In this paper, we propose its practical implementation based on finite M-QAM constellations. ...

Cell-edge users inevitably experience strong interference from adjacent cells, and consequently suffer from performance degradation. Currently, Han-Kobayashi (HK) rate splitting scheme is viewed as the best strategy to cancel the interference and ...

One of the most powerful ways to achieve transmission reliability over wireless links is to employ efficient coding techniques. This paper investigates the performance of a transmission over a relay channel where information is protected by two layers ...

Existing work has demonstrated that network coding can significantly reduce system delay in multi-source and multi-destination scenarios. However, such a scheme doesn't take consideration in terms of throughput In this paper, we propose to use rateless ...

Wake-up radios present a promising alternative to traditional duty-cycle approaches, by reducing overhearing and by eliminating idle listening completely. However, energy-efficient operation of the wake-up mechanism is required for the success of such ...

This paper presents a joint source/channel coding method in 3D-JPEG2000 for wireless transmission of 3D regions of interest (RoIs) in 3D medical images. The method provides unequal error protection by combining the error correction capabilities of ...

Direct measurement of event and component resolved energy dissipation in computing systems is critical for energy optimization of computing and networking applications. Prior research focuses on development of energy consumption models and custom-built ...

Standby power consumption of electric devices is a growing waste of energy. Between 5% and 14% of the residential electrical power consumption is caused by devices being in standby mode. Depending on the device type, more than 50% of standby power ...

This paper revisits the problem of multisession multicast tree construction with bandwidth allocation in wireless sensor networks. Previous work has shown that when the goal is to find multicast routing tree, the problem becomes NP-complete. In this ...

Routing packets over multiple disjoint paths towards a destination can increase network utilization by load-balancing the traffic over the network. In wireless mesh networks, multi-radio multi-channel nodes are often used to create a larger set of ...