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The IEEE 802.11e standard has been introduced recently for providing Quality of Service (QoS) capabilities in the emerging wireless local area networks. This standard introduces a contention window based Enhanced Distributed Channel Access (EDCA) technique that provides a prioritized traffic to guarantee the minimum bandwidth needed for time critical applications. However, the EDCA technique re...

Motion Estimation (ME) is the critical part of any video coding system. The video quality will be affected if an error has occurred in the ME. Motion Estimation is the process of determining the motion vectors that describe the transformation from one 2D image to other, usually from adjacent frames in a video sequence. In order to test Motion Estimation in a video coding system Error Detection ...

The IEEE 802.11e standard was introduced to overcome the lack of QoS support for the legacy IEEE 802.11 WLANs. It enhances the Media Access Control (MAC) layer operations to incorporate service differentiation. However, there is a need to prevent overloading of wireless channels since the QoS experienced by traffic flows is degraded with heavily loaded channels. An admission control scheme for ...

Selfish users are known to be a severe security threat for wireless ad-hoc networks. In particular, they can exploit mechanisms designed to assure QoS in the network. In this paper the problem of backoff misbehavior in IEEE 802.11 EDCA networks is studied using a game-theoretic approach. First, it is shown how this selfish behavior can disrupt traffic differentiation. Then, a solution is propos...