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Current video services are still controlled in an old-fashioned way using keyboard and mouse for computers and remote control for TV sets. This paper presents more attractive and intuitive interaction methods using commercially available motion sensing input devices. These devices are typically based on a webcam-style add-on peripheral, thereby enabling facial recognition, gesture control, and speech...
The increasing demand of wireless telecommunication services is stressing the availability of radio spectrum to accommodate new services. Nevertheless, spectrum usage surveys performed in different regions reveal an under-utilization of radio spectrum. TV White Space (TVWS) technologies allow a dynamic usage of the Very High Frequency (VHF) and Ultra High Frequency (UHF) television channels. In this...
In the last decade, we have seen the uptake of connected solutions to support and improve manufacturing, warehousing and distribution operations in industry. However, deterministic and reliable wireless communication in large-scale, dynamic and mobile applications still remains one of the greatest challenges for the realization of the Digital Factory of the Future. In this paper, we investigate more...
In order to remain cost competitive, dairy farmers are equipping their animals with automatic health monitoring systems. An important obstacle for integrating these systems is the high energy consumption of the on-cow components. A solution is wireless charging of the automated system at a feeding trough by inductive coupling. We developed an inductively powered system that is charged each time the...
For the first time, a wearable personal distributed exposimeter (WPDE) is designed and calibrated for the Long-Term Evolution (LTE) 800 and 2600 MHz downlink bands. The proposed WPDE has a 68% confidence interval of 4.8–5.6 dB for different number of antennas and polarizations. Measurements of the WPDE are compared and validated with a commercial exposimeter in a real environment.
This paper presents propagation modelling of different on-body and off-body wireless communication scenarios for dairy cows in barns at 2.4 GHz. Based on the obtained propagation models, a WBAN that monitors multiple heath parameters is designed for optimal performances in terms of energy efficiency and packet error rate.
This paper presents a measurement-based analysis of both the specular- and dense multipath components (SMC and DMC) at 94 GHz in an indoor environment. A total of 15 positions were measured with a virtual antenna array system, from which we have calculated Power Delay Profiles (PDP). A method was developed that allowed for the full-polarimetric estimation of the specular propagation paths, after which...
Human exposure to electric and magnetic fields has been amply investigated in the extremely-low frequency (ELF) and radiofrequency (RF) ranges. However, research on typical emissions in the intermediate-frequency (IF) range remains limited. In this study, an extensive measurement survey was performed on the levels of electric and magnetic fields at intermediate frequencies typically emitted by a wide...
This paper presents a study of the efficacy of different optimization strategies for location tracking on an Android App that is run on a smartphone. The basic algorithm determines the most probable path of the user within a WiFi network by comparing raw RSSI measurements at each location with values in a fingerprint database. The investigated optimization strategies include: accounting for previous...
This paper presents a future terminal antenna to enhance the performance of wireless container monitoring systems. It first introduces an optimized design that is experimentally validated for Wireless Personal Area Network (WPAN) technology taking into account the harsh environment of containers. The proposed antenna exhibits excellent performance next to the container in terms of return loss, gain,...
In case of a large scale disaster, the wireless access network can become quickly saturated. This is of course undesirable because for this kind of situations we actually need a reliable wireless connectivity. In this study, the potential of mounting LTE femtocell base stations on drones to offer an alternative for the saturated existing wireless infrastructure is investigated. Our preliminary results...
Wireless body area networks have raised considerable attention within the wireless personal area community. To optimize the network architecture and the energy consumption of on-body equipments, a good knowledge and understanding of the radio link and the propagation channel are required. This work addresses the influence of medium presence on the reflection loss of horn and textile antennas. In particular,...
A mobile application is presented for real-time testing and optimization of path-loss models and network planning, based on the execution of validation measurements in the considered environment. The application is tested in three indoor scenarios and for three path-loss models. Without optimization, average absolute prediction errors of about 5 dB are obtained, with a simple free-space model performing...
This preliminary work presents a comparative study of human body compensation models for localization and tracking purposes. Besides the well known influence of multipath fading and diffraction on the performance of localization systems, the influence of the user itself is often still neglected. The presence of such a user can block the radio-frequency (RF) signal paths between a body-worn node and...
Wireless communication is an enabling technology for industrial automation. For mobile industrial devices operating in large areas, the performance of the wireless handover process is crucial. For the welfare of industrial processes short time communication outage must be ensured, especially for time-critical traffic. This paper assesses the handover performance for three industrial real-life use...
Nowadays, the energy price is rising. The consciousness of environmental sustainability of governments and customers has been ever increasing. Consequently, manufacturing enterprises are increasingly motivated to reduce the energy cost involved in their production activities. This paper proposes a novel production scheduling method to minimize the energy cost involved in the production at the unit...
In this study, the potential of applying different strategies to reduce the energy consumption of a wireless access network, powered by a photovoltaic panel system, during energy shortages is investigated. The goal is to reduce the amount of energy that should be bought from the traditional energy grid during a renewable energy shortage. Three different strategies are compared and the results are...
Nowadays, wireless access networks are already amongst the top power consumers in the ICT (Information and Communication Technology) sector. As it expected that these networks will further expand in the future due to the extreme growth in mobile devices and the high bit rate demand of the applications running on these devices, it is important to consider power consumption as a key parameter in the...
This work presents a novel localization scheme based on Ultra-Wideband (UWB) channel sounding, employing a triangulation method that makes use of the geometrical properties of propagation paths, such as time of arrival (ToA), angle of departure (AoD) and angle of arrival (AoA). An extension to the high-resolution RiMAX algorithm was developed, facilitating the analysis of UWB frequency-dependent propagation...
The reduction of power consumption in wireless access networks is a challenging and important issue. In this paper, we apply Opposition-Based Learning (OBL) concepts for reducing the power consumption of LTE base stations. More specifically, we present a new Modified Biogeography Based Optimization (BBO) algorithm enhanced with OBL techniques. We apply both the original BBO and the new Modified Opposition...
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