Nurul I. Sarkar

Wi-Fi Performance Measurements in the Crowded Office Environment: a Case Study

Wi-Fi link throughput performance in the crowded (obstructed) office environment is investigated. Using a pair of wireless laptops we conducted several experiments involving Wi-Fi computer links, which were carried out at the AUT University within the School of Computer and Information Sciences office building. Line-of-sight blockage by office walls and corners is found to have the significant effect on the Wi-Fi link throughput while the transmitter/receiver orientation is found to have insignificant effect. Our findings show the feasibility of deploying wireless local area networks (WLANs) in a crowded office building.

A study of MANET routing protocols: Joint node density, packet length and mobility

The dynamic topology of a mobile ad hoc network (MANET) poses a real challenge in the design of a MANET routing protocol. Over the last 10 years, a variety of routing protocols have been developed and their performance simulations are made by network researchers. Most of the previous research on MANET routing protocols have focused on simulation study by varying network parameters, such as network size (node density), pause times, or node mobility independently. This paper considers the problem from a different perspective, using a simulation model the combined effect of node density and packet length; node density and mobility on the performance of a typical 802.11 MANET is investigated. This is a common and realistic scenario in MANETs where nodes move around, join and leave the network at any time. Based on the QoS (end-to-end delay, throughput), routing load and packet retransmissions, this paper systematically analyzes the performance of four diverse MANET routing protocols with the different simulation model and configurations, and drew more complete conclusions.

Teaching wireless communication and networking fundamentals using Wi-Fi projects

Wireless communication and networking often proves to be a quite challenging subject to teach in a meaningful way, because many students appear to find the subject rather dry and technical, and thus quite boring. The authors have prepared some interesting projects to provide the students of wireless communication and networking with a hands-on learning experience. These projects are designed around low-cost Wi-Fi modules and PC cards that are available from local electronics shops. The projects are suitable for classroom use in introductory-level courses about wireless networking. The effectiveness of these projects has been evaluated by both students and teaching team. The feedback from students indicates that both the development and implementation of the projects were successful. This paper describes these projects, their overall effectiveness, and plans for further projects. The impact of Wi-Fi projects on student learning and comprehension is also discussed.

Review: A comprehensive survey on scheduler for VoIP over WLAN

Voice over Internet Protocol (VoIP) technology has observed rapid growth in the world of telecommunications. VoIP offers high-rate voice services at low cost with good flexibility, typically in a Wireless Local Area Network (WLAN). In a voice conversation, each client works either as a sender or a receiver depending on the direction of traffic flow over the network. A VoIP technologically requires high throughput, less packet loss and a high fairness index over the network. The packets of VoIP streaming may experience drops because of competition among the different kinds of traffic flow over the network. A VoIP application is also sensitive to delays and requires voice packets to arrive on time from the sender to the receiver without any delay over a WLAN. To date, scheduling of VoIP traffic is still an unresolved problem. The objectives of this survey paper are to discuss fundamental principles of VoIP-related schedulers and identify current scheduler issues. This survey paper also identifies the importance of the scheduling techniques over WLANs. Related research work for real-time applications specifically for VoIP will also be highlighted.

Illustrating computer hardware concepts using PIC-based projects

We are developing a series of interesting projects that give students a hands-on introduction to computer hardware concepts. Our projects are designed around the PIC16F84, a powerful 8-bit microcontroller chip that sells for less than

Vehicle-to-infrastructure communication over multi-tier heterogeneous networks

10. The projects are suitable for classroom use in introductory level courses about computer hardware. The effectiveness of these projects has been evaluated both formally by students (student evaluation forms) and informally - through discussion within the teaching team. The feedback from students indicates that the development and implementation of the projects were successful. This paper describes the details of the projects completed to date, their overall effectiveness and our plans for further projects.

Indoor Propagation Measurements for Performance Evaluation of IEEE 802.11g

Vehicle-to-infrastructure (V2I) communication is vital in the successful deployment and operation of intelligent transport systems (ITS). One can observe a growing research interest on the effectiveness of V2I communication in the Fifth Generation (5G) networks supporting a co-existence of multi-tier heterogeneous wireless networks with diverse radio access technologies (RATs). The goal of this survey paper is to present the basic characteristics of V2I communication in heterogeneous multi-tier network environments. We first provide an overview of notable V2I applications and few of V2I related projects. We then focus on V2I communications over heterogeneous multi-tier networks. We identify several V2I research challenges and discuss possible solutions.

Teaching computer hardware and organisation using PIC-based projects

Using indoor propagation measurements, the throughput performance of an IEEE 802.11g wireless local area network (WLAN) under different received signal strength (RSS) values is investigated. By using a pair of wireless laptops and an access point (AP) we conducted several experiments involving IEEE 802.11g computer links, which were carried out in an obstructed office block at the AUT University within the School of Computing and Mathematical Sciences office building. Results obtained show that the link throughput of an IEEE 802.11g is not always increasing with RSS in an obstructed office building.

Buffer unit multiple access (BUMA) protocol: an enhancement to IEEE 802.11b DCF

It can be difficult to motivate students to learn about computer hardware because students find the subject rather dry and theoretical. We have prepared a series of interesting projects that give students a hands-on introduction to computer hardware and organisation. Our projects, designed around the PIC16F84, a powerful 8-bit microcontroller chip that sells for less than

LAN-designer: a software tool for teaching and learning LAN design

10, are suitable for classroom use in introductory-level courses about computer hardware. Their effectiveness has been evaluated both formally by students and informally through discussion within the teaching team. Feedback from students indicates that both development and implementation were successful. This paper describes the projects completed to date, their overall effectiveness and our plans for further projects.