Zouhair El Bazzal

Kinect-Based Moving Human Tracking System with Obstacle Avoidance

A R T I C L E I N F O A B S T R A C T Article history: Received: 04 March, 2017 Accepted: 14 April, 2017 Online: 24 April, 2017 This paper is an extension of work originally presented and published in IEEE International Multidisciplinary Conference on Engineering Technology (IMCET). This work presents a design and implementation of a moving human tracking system with obstacle avoidance. The system scans the environment by using Kinect, a 3D sensor, and tracks the center of mass of a specific user by using Processing, an open source computer programming language. An Arduino microcontroller is used to drive motors enabling it to move towards the tracked user and avoid obstacles hampering the trajectory. The implemented system is tested under different lighting conditions and the performance is analyzed using several generated depth images.

LISA: Listening-based immediate SCH access scheme in VANETs

Vehicle Ad-Hoc Networks was developed in order to improve the safety and comfort while driving a car. Thereby, IEEE 802.11p and IEEE 1609.4 are used for this purpose. However, these protocols showed some limitations, and this is showed through the low probability of successful transmission for safety messages and through the low throughput achieved for service messages. This paper proposes new mechanism, Listening-based Immediate SCH Access (LISA), which enhances the channel utilization, i.e. improving the probability of successful safety packets transmission and increasing the throughput for service packets. Using LISA scheme, the probability of successful transmission has increased by 14% when the probability of transmission is equal to 80%, and the throughput has increased up to five times compared to the original protocol.

ANC-based broadcasting technique in vehicular networks

In wireless networks, trying to avoid interferences by using allocation and scheduling techniques is not an effective and permanent solution. In a high density network where nodes can have a large communication range, the channel capacity can be insufficient to support all broadcast messages even if they are perfectly scheduled. This is the case of the control channel (CCH) in the IEEE 1609.4 standard for Wireless Access in Vehicular Environments. Moreover, in broadcast messages, there is neither acknowledgement nor retransmissions. Also, the expiry time restriction of safety messages pushes each vehicle to diffuse its message during one CCH interval. To deal with these problems, we propose a new approach which separates two collided messages on the signal level. Our method, which is technically based on the Analog Network Coding (ANC), allows to recover collided packets like the ZigZag decoding technique but without needing retransmissions. Simulations results show a high performance for our scheme in packet reception ratio and channel capacity.