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This paper focuses on improving the scheduling capabilities of the IEEE 802.16-2005 broadband wireless networks, through utilizing multi-queuing algorithms and switching between those queuing algorithms over time to maximize the performance of the WiMAX system. The proposed algorithm aims to improve throughput of high priority traffic in congested networks, without violating the right of lower-priority-traffic...
Peer-to-peer (P2P) multimedia streaming provides a scalable solution for IPTV. However, delays from channel switch and streaming recovery are typically in the scale of 10-60 seconds, which have hindered the extensive commercial deployment of P2P systems. We call these two types of delays, churn-induced delays. Obtaining assurances on churn-induced delays in dynamic and heterogeneous network environments...
Network virtualization has been proposed as a diversifying attribute of the future inter-networking paradigm. By allowing multiple heterogeneous network architectures to cohabit on a shared physical substrate, network virtualization provides flexibility, promotes diversity, and promises increased manageability. One of the most fundamental issues in network virtualization is to support multiple virtual...
Current mode (CM) scheme provides suitable alternative for the high speed on-chip interconnect signaling. This paper presents a energy-delay optimization methodology for the current-mode (CM) signaling scheme. Optimization for the CM circuits for on-chip interconnects requires a joint optimization of driver and receiver device sizes, as their parameters which affect the energy-delay performance depend...
Datasets of tens of gigabytes are becoming common in computational and experimental science. Providing remote visualization of these large datasets with adequate levels of quality and interactivity is an extremely challenging task, particularly for scientists who collaborate in widely distributed locations and their primary access to visualization resources is a desktop computer. This paper describes...
As the number of disks in a storage sub-system keeps increasing, the back-end network may become the bottleneck and thus impose a constraint on system performance. Unfortunately, there is no visible literature base on storage back-end network bottlenecks and scalability. This paper studies the scalability of the back-end network by answering two questions: (1) which factors affect the back-end network...
In this paper we discuss performance results of a novel real-time closed-loop power amplifier (PA) linearization technique that has originally been proposed by Ahmed and Li. The novel approach performs on-the-fly prediction and measurement of the PA AM/AM and AM/PM non-linearity, stores such non-linear characteristics and calculates their inverse functions in order to pre-distort the base-band amplitude...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
Video-streaming can now be offered on third-generation (3G) mobile networks. Most research efforts have focused on video download. This paper presents a detailed study of challenges faced for successfully deploying applications requiring life video upload. Both subjective and objective qualities as well as the effects of mobility are analyzed on real 3G networks. Consequently, video profiles are identified...
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