The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We demonstrate robust error-free transmission of 51.56 Gbit/s PAM-4 over multiple examples of 100m of multimode fiber with 905nm VCSELs. We further demonstrate the need to include level dependent RIN when assessing impairments and predicting performance of PAM-4 MMF links.
For content delivery in Peer-to-Peer (P2P) video streaming systems there are two main approaches: push-based and pull-based. In P2P Video-on-Demand (VoD) systems, neighbor peers might watch the same video with very large differences in viewing point; thus using push-based approach is not sufficient for these systems. Also, with using pull-based approach, peers need large buffers to achieve better...
Several redundancy and recovery schemes have been developed to enhance the reliability of storage systems. The effectiveness of these schemes has predominately been evaluated based on the mean time to data loss (MTTDL) metric, which has been proven useful for assessing tradeoffs, for comparing schemes, and for estimating the effect of the various parameters on system reliability. In the context of...
Radio frequency spectrum within 3–300 GHz has been investigated for the next generation of mobile broadband system. The mmWave mobile broadband (MMB) system is expected to achieve high capacity by utilizing immense bandwidth. However, high attenuation property of mmWave generates outage zone where the signal does not reach frequently in MMB system. To cover outage zone, relay operation has been suggested...
With the fast emergence of Software-Defined Networking (SDN) and Cloud SIP Fire Wall (SFW), new solution is possible to defend SIP DoS attacks in IMS core network, which is impossible in traditional telecomm network through traditional SFW. In this paper, we first analyze the security threats of SIP DoS attacks in the telecomm network. And then based on the analysis, we construct the SIP DoS attack...
This paper describes a method of estimating the effective bandwidth through modeling the tail probability of one-way cumulative variable delays. In order to estimate the effective bandwidth of a fixed one-way path, a sequence of probing packets are sent from a source to a sink along the one-way path. The one-way cumulative variable delays are first estimated based on the local time measurements made...
Reliability is a critical metric in the design and development of scale-out data storage clusters. A general multiway replication-based declustering scheme has been widely used in enterprise large-scale storage systems to improve the I/O parallelism. Unfortunately, given an increasing number of node failures, how often a cluster starts losing data when being scaled-out is not well investigated. In...
Data center networks demand high bandwidth switches. These networks also sustain common in cast scenarios, which require large switch buffers. Therefore, network and switch designers encounter a buffer-bandwidth trade off as follows. Large switch buffers allow absorbing larger in cast workload. However, higher switch bandwidth allows both faster buffer draining and more link pausing, which reduces...
Performance modelling is a useful tool in the lifeycle of high performance scientific software, such as weather and climate models, especially as a means of ensuring efficient use of available computing resources. In particular, sufficiently accurate performance prediction could reduce the effort and experimental computer time required when porting and optimising a climate model to a new machine.
We consider a multirate loss model of a link that accommodates Poisson calls. Calls compete for the available link bandwidth under the combination of the Threshold (TH) and the Bandwidth Reservation (BR) policies. The TH policy limits calls of each service-class up to a threshold, which can be different for each service-class. The BR policy reserves part of the available link bandwidth to benefit...
Current wireless communication systems rely on the assumptions of the Nyquist theorem. Faster-Than-Nyquist (FTN) assumes that a bandwidth below the Nyquist bandwidth can be used with minimum loss, however the existing receivers are too complex. Single Carrier with Frequency-Domain Equalization (SC-FDE) has been proposed to handle multipath dispersive broadband channels, however the uplink of SC-FDE...
In analyzing and processing the acquired sea clutter data, the spectrum is a very important characteristic. The acquired sea clutter data can be treated as a kind of nonlinear and non-stationary data. The traditional processing method, such as Fourier Transform or Wavelet Transform, etc., is not a good deal for processing it. To extract the spectrum characteristics of the acquired sea clutter data...
Although BitTorrent is gaining popularity and continuous usage as a file sharing system, it is bedeviled with some challenges. Developers and researchers alike are exerting efforts to address such challenges. Free riders exploitation of BitTorrent is a widely acknowledged problem. In particular, free riders misuse BitTorrent through both optimistic and regular unchoke. In this article, we use game...
Network on Chip (NoC) is a sophisticated communication infrastructure that provides quality of service (QoS) guarantees for a complex Systems-on-Chip (SoC) application. Some applications demand guaranteed end-to-end latency. Mapping algorithms are used to map an application on an NoC to satisfy the bandwidth constraints and end-to-end latency requirements. The design of the mapping algorithms determines...
Passive Optical Networks (PONs) constitute a predominant point-to-multipoint architectures for an efficient and cost-effective fiber-based broadband access. We have analyzed several PON configurations, which either have been already standardized, like Wavelength Division Multiplexing — Time Division Multiplexing (WDM-TDM) PONs, or are highly promising PON technologies, like Optical Code Division Multiple...
Hybrid Wavelength-Time Division Multiplexing (WDM-TDM) Passive Optical Networks (PONs) become strong candidates for Next Generation PONs and, therefore, merit deep performance evaluation. In this paper, we concentrate on the performance of a Dynamic Wavelength Allocation (DWA) protocol, under multi-dimensional traffic which is modeled by a Pareto ON-OFF model; it resembles the bursty nature of traffic...
Extreme-scale computing will bring significant changes to high performance computing system architectures. In particular, the increased number of system components is creating a need for software to demonstrate "pervasive parallelism" and resiliency. Asynchronous, many-task programming models show promise in addressing both the scalability and resiliency challenges, however, they introduce...
Continuing increase in the computational power of supercomputers has enabled large-scale scientific applications in the areas of astrophysics, fusion, climate and combustion to run larger and longer-running simulations, facilitating deeper scientific insights. However, these long-running simulations are often interrupted by multiple system failures. Therefore, these applications rely on "check...
Scaling the applications output quality in order to meet constraints and keep preserving NFPs is an important adaptation technique in modern embedded systems. In this paper, we propose a model driven framework for the modeling, NFPs verification and application reconfiguration of multitask networked RTE systems. We use the UML standard and an extension of the MARTE profile for the system high level...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.