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Spectral testing and linearity testing are two important categories in ADC testing. The sampling clock quality is a crucial factor in ADC spectral testing. The cumulative clock jitter of the sampling clock generates power leakage in the fundamental component of the ADC output spectrum, and the random clock jitter increases the noise floor of the ADC output spectrum, which corrupts the spectrum result...
IPv6 is an ultimate solution to the Internet address exhaustion. It is believed, the protocol will be requested by not only human but also everything on the earth surface. Furthermore, the improvement on the protocol is important to achieve IP packets transmission efficiently. Processing technology has been improved to become very fast packet processing both in host as well as intermediate systems...
Road safety applications heavily rely on periodic message exchanges known as beaconing in order to gain awareness about the current situation within the vehicle communication range. The high level of transmission contention in dense vehicular networks can induce successive beacon collisions. These collisions impede the vehicles to have an up-to-date view of the environment which can lead to bad decisions...
Data converters continue to push the boundaries of performance by achieving higher sampling speeds and wider bandwidths. In today's data converters, GS/s is starting to become common-place. This forum brings together experts from industry and academia to talk about recent advancements that have enabled these breakthroughs. These experts will present the state-of-the-art and address design challenges...
The emergence of new multimedia applications and real-time services have necessitated networks with guaranteed quality of service (QoS). For mobile networks, LTE is expected to provide low-latency and capacity improvement for interactive and real-time applications which have critical delay and jitter requirements. Indeed, the problem of measuring the end-to-end network performance over LTE networks...
We present a simulation-based study of the impacts of channel switching overhead on the performance of multicast in multi-channel multi-radio wireless mesh networks (MCMR WMNs). We study how channel switching overhead affects the performance metrics such as packet delivery ratio, throughput, end-to-end delay, and delay jitter of a multicast session.
A Virtual Private Network (VPN) is a technology that is used to securely connect private network passing through a public network such as the Internet. Using a VPN, a computer, tablet, or smartphone is able to securely connect with others in the Internet as if they were part of a private network. Using this technology may also bring security threats like spoofing, snipping, and hacking as the data...
This paper provide an overview of behaviour of transition mechanisms, with and without VPN Protocols. Performance metrics related to networks have been gathered from test-bed implementations. The two transition mechanisms we will be evaluating are 4to6 and 6to4. Both of these mechanism have certain advantages and disadvantages. VPN protocols, PPTP and IPsec were configured on the transition mechanism...
The utilization of Ethernet in the cellular terrestrial cloud radio access network (C-RAN) fronthaul is considered as a way for improving C-RAN network reconfigurability and efficiency in terms of both capital and operational expenditures. Moreover CPRI line bit rate dynamic reconfiguration may spare further capital expenditures by avoiding a peak traffic capacity allocation. A possible solution for...
Software-Defined Networking technologies are rapidly reaching wireless environments and a number of questions arise regarding its efficiency in such scenarios. This work evaluates the OpenFlow performance in scenarios with based commodity wireless router running an Open vSwitch (OVS) Linux kernel module and different SDN controllers. A set of client hosts connected at the commodity wireless router...
This article describes the performance evaluation of a new wireless TCP algorithm in real environments, in order to identify the advantages and disadvantages of its operation. We evaluate the proposed wireless TCP algorithm with respect to generic TCP, considering an intrusive technique by using traffic injection. These tests were performed over point-to-point WiFi and WiMAX links in out-door and...
Failure detection is a crucial service for dependable distributed systems. Traditional failure detector implementations usually target homogeneous and static configurations, as their performance relies heavily on the connectivity of each network node. In this paper we propose a new approach towards the implementation of failure detectors for large and dynamic networks: we study reputation systems...
The topic of this paper is to propose a new network design algorithm which defines an efficient multi-path routing scheme in an MLPS network. Our goal is to offer QoS guarantees for delay and jitter which are considered as important performance metrics for interactive and real time services. To this end, we have formulated several nonlinear objective functions for determining network link utilization...
Autonomic networking refers to the self-managing characteristics (configuration, protection, healing, and optimization) of distributed network elements, adapting to unpredictable changes while hiding intrinsic complexity from operators and users. Autonomic Networking, which often involves closed-loop control, is applicable to the complete network (functions) lifecycle (e.g. installation, commissioning,...
WiMAX (World Wide Interoperability for Microwave Access) is a standard based technology based on IEEE 802.16 Air Interface. This standard is the future mode of mobile communication. Therefore, it is important to evaluate the performance of WiMAX in different scenarios. In this paper we have presented performance analysis of WiMAX for the CBR (Constant Bit Rate) traffic with and without mobility. Two...
Internet protocol (IP) telephony is sensible in the view of providing platform for faster information exchange using voice calls and its demand is increasing. IP telephony in heterogeneous network environments can prove its dominating characteristics over circuit switched network. General packet radio service (GPRS) is mostly used network in India. Interface, using serving GPRS support node (SGSN)...
IEEE 802.16 well known as WIMAX is defined as the standard of Broadband WMAN networks. This technology is able to mix real time and non real time services with the definition of service classes. To efficientlty schedule traffics of different classes, we proposed in a previous work a token bucket based scheme and evaluated its performances by means of probabilistic models. In this paper, we explore...
The exponential increase in smartphone use has caused a paradigm shift in the Internet access pattern from traditional applications to VoIP, video streaming, and social networking. These changes urge the demand for high-speed mobile network access technologies day-by-day. In this paper, we evaluate the performance of Long Term Evaluation (LTE) network for VoIP application, focusing primarily on downlink...
The main challenge in the engineering of IP networks is the integration and support of a wide variety of applications and services combining voice, data, streaming, and VoD that have different traffic characteristics and require different levels of quality of service (QoS). The most important measures of QoS are the end-to-end delay, packet loss rate and delay variation or jitter. Any network design...
Flexibility is a key requirement in automation. This requires flexible solutions for design and implementation of field devices. The easy implementation of device functions for an early test in a system can be performed by introducing generalized approaches. The Generic Device, based on standard IT hard- and software, is an approach addressing this flexibility. The availability of low-price controller...
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