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Delay-tolerant networking effectively extends the network connectivity in the time domain, and endows communications devices with enhanced data transfer capabilities. Network coding on the other hand enables us to approach the information capacity of networks by allowing intermediate nodes to process data en route. Both of these were major principal breakthroughs in mobile and wireless communications...
Traditional cellular networks play an essential role in the evolution of machine-to-machine (M2M) networks, due to their ubiquitous network coverage. However, M2M communications have some unique characteristics, which are different from the conventional human to human communications, such as the massive number of connected machine type devices (MTD) and stringent QoS requirements. This requires an...
We study a new relay selection scheme in nonregenerative relay networks consisting of a source, a destination, an eavesdropper, and multiple relays, where each terminal has a single antenna and operates in a half duplex mode. In these networks, it is desirable to protect the confidential message from the source to the destination against the eavesdropper with the help of a single selected relay. Specifically,...
In this paper, a novel one bit resolution ADC for wireless communication devices is presented. If we use a conventional one bit resolution ADC for wireless communication devices, the communication quality becomes worse due to heavy non-linearity. To overcome this problem, we proposed a novel one bit resolution ADC circuit with linearity enhancement technique, which uses a S/H and a hysteresis comparator...
In this paper, we propose a cognitive transmission scheme for Amplify-and-Forward (AF) two-way relay networks (TWRNs) and investigate its joint sensing and transmission performance. Specifically, we derive the overall false alarm probability, the overall detection probability, the outage probability of the cognitive TWRN over Rayleigh fading channels. Furthermore, based on these probabilities, the...
This study demonstrates a feasible online user-state monitoring system using an affordable consumer-grade wireless brain wave headset. The system was able to track the workload level in real-time with approximately 78% accuracy.
Vehicle-to-Vehicle (V2V) communication is an en-abler for improved traffic safety and congestion control. As for any wireless system the ultimate performance limit is determined by the propagation channel. A particular point of interest is the shadowing effect of large vehicles such as trucks and buses, as this might affect the communication range significantly. In this paper we present measurement...
Energy harvesting has been widely considered in many wireless applications, especially the wireless sensor networks. This paper develops a novel approach to energy-harvesting powered transmissions under arbitrary packet arrival process and strict deadline constraints over time-varying channels. It is shown that the problem can be formulated as a convex program. Relying on the specific structure of...
Concerning the problems that Non-Line-Of-Sight (NLOS) error affects the location accuracy in cellular wireless location systems, a location and tracking algorithm based on the two-step Kalman filter algorithm was proposed. The algorithm first used the mean value of new information which was produced in the Kalman filter iteration process to identify and to eliminate the NLOS error, and then got the...
As the capsule endoscope lens will produce geometric distortion, while there is an angle and a corner between the camera image plane and the plane of scene, so the images of capsule endoscope get nonlinear geometric distortion. Before the capsule endoscope images are used to accurately analysis, we should eliminate these distortions. Typically, the correction uses a calibration pattern, which can...
This paper introduces a system for chaotic traffic control; the proposed system is a simple, sophisticated and robust version of the Intelligent Traffic Light Flow Control System Using Wireless Sensors Networks proposed by Khalil M. et al. The proposed system adopts a simple approach by adding more Traffic Sensing Nodes [TSN] and distributing them in a matrix layout covering the road bed. In addition...
Project-Based Learning (PBL) can significantly motivate students to learn engineering concepts. This paper reports on the experience at Princess Sumaya University for Technology of utilizing PBL to enhance the teaching of wireless communication course. In the project, students are asked to collect real world measurements of cellular towers signal power. The data is then plotted versus distance for...
Device to device (D2D) communication is expected to become a promising technology of the next-generation wireless communication systems. Security issues have become technical barriers of D2D communication due to its “open-air” nature and lack of centralized control. Generating symmetric keys individually on different communication parties without key exchange or distribution is desirable but challenging...
We had the great pleasure to welcome all participants to the 7th IFIP Wireless and Mobile Networking Conference. (WMNC 2014), organized by the University of Coimbra, and held in Vilamoura, Portugal, May 20 – 22, 2014. WMNC 2014 was sponsored by IFIP TC6, and technically co-sponsored by the IEEE Communications Society.
This paper considers the state feedback stabilization over finite-state fading channels, where the stochastic characteristic of time-varying fading channels is assumed to be driven by a finite-state random process. The finite-state process is used to represent different channel fading amplitudes and/or to model different configurations of the overall physical environment. Necessary and sufficient...
In this paper, a group of outdoor wireless sensors are assigned to trace the indoor barriers. We introduce a framework based on compressive sensing theory that allows sensors to map the 2D spatial details of a building non-invasively. By exploiting an alternative projection method, called fan-beam, sensors can efficiently observe area indirectly. It is also shown that how sparse representation of...
This paper investigates the energy efficiency of base station sleep scheduling strategies in 1-D infrastructure-based wireless communication networks formed by vehicles traveling on a highway. In certain scenarios, vehicular speeds and locations can be measured with a high degree of accuracy, and this information can be exploited to reduce the energy consumption of base stations. This paper considers...
The paper presents the improvement offered by spatial diversity to reduce fading in ultra wideband (UWB) body-centric wireless communication channel in context of second order statistics for five different measured links, i.e., waist-to-chest, waist-to-head, waist-to-wrist, waist-to-ankle and waist-to-back. Average fade duration (AFD) and level crossing rate (LCR) values are presented and compared...
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