The objective of this paper is to propose a novel method for enhancing end to end QoS of multimedia applications in mobile adhoc networks by using DiffServ approach and Multi Description Coding. The enhancement is achieved by implementing the Multi Description Coding (MDC) at application layer along with Connectionless Light Weight Protocol (UDPLite) in transport layer, Multipath routing and DI...

This report summarizes our PHY layer implementation of a OFDMbased superposition coding system. In theory, multi-user techniques such as superposition coding (SPC) are known to improve throughput in wireless networks. However, in order to understand their practical limitations, it is imperative to actually implement and experiment with such techniques in a realistic setting. In this report, we ...

Introduction: The problem of compressed pattern matching deals with ways to find a pattern within a compressed file, without decompressing it first. The techniques for solving this problem fall into two major categories – creating a unique compression scheme that enables efficient pattern matching; or using some known compression scheme and develop algorithms to search the files it produces. In...

Undoubtedly, Peer-to-Peer (P2P) technology is an effectively method for delivering streaming media content over the internet. However, current P2P stream systems also suffer many problems, such as huge bandwidth consumption, less effective in heterogeneous environment, etc. Scalable video coding (SVC), as an extension of H.264/AVC standard, has attracted many researchers for its flexible scalab...

A novel Wyner-Ziv scalable (WZS) video coding approach is proposed to enhance MPEG-4 fine granularity scalability (FGS). Starting from the same base layer as MPEG-4 FGS, the proposed coder can achieve higher coding efficiency using Wyner-Ziv coding, by selectively exploiting the high quality reconstruction of the previous frame in the enhancement layer bitplane coding of the current frame. This...

Forward error correction (FEC) coding is widely used in communication systems to correct transmission errors. In IEEE 802.11a/g transmitters, convolutional codes are used for FEC at the physical (PHY) layer. As is typical in wireless systems, only a limited choice of pre-specified coding rates is supported. These are implemented in hardware and thus difficult to change, and the coding rates are...

This paper aims at investigating the superiority of power allocation strategies, based on calculus of variations in a point-to-point two-way relay-assisted channel incorporating the amplify and forward strategy. Single and multilayer coding strategies for two cases of having and not having the channel state information (CSI) at the transmitters are studied, respectively. Using the notion of cal...