Analysis of video transmission over wireless networks with instructional design

Dissertant

al-Khazaali, Hassan Fahad Khazaal

Thesis advisor

Khamis, Nasir Nafi
al-Hiazi, Shaukat Dhiyab

University

University of Technology

Faculty

-

Department

Department of Electrical Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2009

English Abstract

Supporting quality of service (QoS) in wireless networks has been a very rich and interesting area of research.

The support for QoS across Mobile Ad hoc Networks and Heterogeneous Networks poses the challenge of packet losses.

These losses happen due to many factors like congestion (impairments at the network layer), interference, noise, multipath fading (impairments at the physical layer).

This thesis studies the effect of these losses on the perceived video quality of two different types of wireless networks; The first type is the Mobile Ad hoc Networks (MANETs), where the impact of parameters such as Obstacles' coverage area, Background Traffic, Node Mobility "speed", and Encoded Video Quality on the perceived video quality have been studied.

The simulation results identify that the above-mentioned parameters have a significant effect on the performance of MANET, since they affect packet loss.

Furthermore, the higher the encoder video quality, the more frequent packet loss and perceived video quality deteriorates more frequently (i.e.

The lower the encoded video quality the higher error resilience than the higher the encoded video quality, in other words the higher the encoded video quality the larger the sensitivity in terms of drop occurrence in video quality deterioration than the lower the encoded video quality.

The large number of obstacles' coverage area is, the larger the sensitivity on the perceived video quality.

The second type considers video transmission over wireless Local Area Network.

Three different algorithms have been studied that differentiate wired and wireless losses.

These Loss Differentiation Algorithms LDAs are called Spike, ZigZag, and Biaz schemes.

Each algorithm estimates the percentage of losses that are due to network congestion and the percentage of losses that are due to physical impairments.

A dynamic Forward Error Correction FEC has been introduced (proportional to packet error rate) to overcome the effect of packet losses due to physical impairments on the perceived video quality.

Other parameters that affect the perceived video quality include, Background Traffic both; Constant Bit Rate "CBR" and Exponential Bit Rate and Physical layer that has been emulated using a two state Markov model.

The simulation results show that the proposed dynamic FEC has an enhancement on the perceived video quality by means of Peak Signal to Noise Ratio PSNR.

To overcome the gap between the theoretical topics and practical topics in the field of streaming video over wireless local area networks, an engineering instructional program has been proposed to train the students in electrical and computer engineering departments.

Main Subjects

Telecommunications Engineering

Topics

• Encryption
• Quality assurance
• Data

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305241