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Hierarchical Internet-like topology generators reflect the hierarchical structure of the Internet, but they neglect the power law property of Internet topologies. On the other hand, common power law topology generators obey the power law, but they do not provide support for different types of nodes. In this paper, we propose a new algorithm for creating Internet-like network topologies. We introduce...
Header compression gains interest with the increasing number of short packets in the Internet, where payload length is small compared to the protocol stack header length. Compression can be applied to the whole protocol stack at once, which is referred to as "monolithic profiles" or can treat individual protocol headers separately, which is referred to as "distributed profiles"...
In this study, the relationship between network access quality and RF quality parameter in the wireless networks which have different characteristics from wired networks when the dedicated terminals being connected to the high speed wireless data networks (in other words, broadband wireless access service networks) such as CDMA IX EV-DO, WCDMA (HSDPA), or Mobile WiMax (WiBro) is analyzed. Also, this...
Channel estimation is of crucial importance for tomorrow's wireless mobile communication systems. This paper focuses on the solution of channel parameters estimation problem in a scenario involving multiple paths in the presence of additive white Gaussian noise. We assumed that number of paths in the multipath environment is known and the transmitted signal consists of attenuated and delayed replicas...
In recent years, there has been a growing demand for the development of authentication, authorization and accounting (AAA) systems for WLAN networks. In this paper we present a network architecture of SQL database servers especially tailored for AAA functions in large WLAN systems. Proposed database network architecture is vendor independent in sense that can be deployed with different AAA server...
The PCs co-operating into the distributed measurement system (DMS) can work on synchronized modality on the basis of the standard IEEE 1588. Nevertheless, the hardware and software architecture of the path involved in the communication PC-measurement instrument (MI) can delay the command. The research given in the paper aims to investigate about the time delay introduced by the software in the communication...
Service-oriented architecture (SOA) is an evolving machine communication process widely deployed and likely to gain further adoption with Web 2.0 implementation. SOA allows loosely coupled operations to communicate information from machines through software to end-users in a highly mobile world. SOA is dependent upon representational state transfer (REST) architecture and implementers face formidable...
This paper presents a technique for evaluation of future radio traffic of circuit switched services in Erlang for near-term outlook using Holt-Winter's exponential smoothing. The proposed traffic prediction technique relies on analysis of traffic data on cells. We propose how to classify traffic data for prediction. The result from a trial in history data of commercial GSM/GPRS network is presented...
The success of modern VoIP-based applications has demonstrated how VoIP technologies are rather mature for replacing current telephony systems and for creating new and flexible modes of communication. Currently there are many open-source libraries, tools, and applications available. Starting from some of them, we have designed and built a complete IP telephony platform including several functionalities...
Optimal route planning is a subject of interest in control systems (robot's motion planning) as well as in people, vehicles or information guidance (traffic management). Basic transport optimization methods, developed and distinguished through the Operations Research scientific principles, however, cannot answer to all "travelling and routing" tasks. In this paper we introduce the novel...
EAP-TLS is one of the best authentication schemes in wireless networks. To make it one of the most secure ones, a client has to authenticate itself using certificates, which allow to authenticate client and server mutually. But as certificates are widespread in a business environment but only less used by private users, mutual authentication in EAP-TLS for public hot-spots is not suitable. Therefore...
In this paper, we propose three different filter bank structures matched to a signals or its statistics namely: 2-channel uniform filter bank, M-channel dyadic nonuniform filter bank and M-channel modified DFT filter bank. First, 2-channel QMF analysis filter bank matched to a signal or its statistics is obtained. In order to obtain this filter bank, the given sequence is first divided into even and...
Packet arrival processes for data network are not consistent with Poisson processes. It has been established that arrival process is self-similar and the number of TCP connections initiated by a user session is heavy-tailed. The heavy tail or long tail distributions yield better model for data packet arrival models than exponential models. In particular it is observed that the Weibull, Pareto and...
In the heterogeneous scenario of standards supporting the deployment of Interactive Television, interoperability seems to be the key issue to grant a deeper market penetration of the digital television in everyday life as well as adequate return of investments to the actors involved in the value chain. This paper presents an innovative architecture to support application interoperability across different...
In this article we propose a parallel concatenated encoder similar to a turbo trellis coded modulation, but where the constituent encoders are chaos coded modulators. We show that, even when the uniform error property does not hold for the kind of constituent chaos coded modulations employed, it is still possible to draw a reasonable bound for the bit error probability at the error floor region based...
To meet increasing QoS requirements of Web applications it is vital to design an efficient Web server. This article describes a pipeline server architecture, which can get intra-request parallelism. Based on control theory, we adopt predictor and feedback control methods to allocate threads of each stage dynamically. As a result, server can satisfy variant workloads adaptively. With the help of these...
In this paper, an adaptive parallel interference cancellation (PIC) receiver is introduced for asynchronous multicarrier code division multiple access based (MC-CDMA) communications systems. The multiple access interference (MAI) estimates are obtained using the bit estimates from the previous stage and the adaptive weights for the bit estimates. The adaptive weights are updated by minimizing the...
In this paper, we propose an energy-aware QoS routing protocol for wireless sensor networks. The protocol finds energy-efficient paths for delay-constrained data in realtime traffic. The described QoS routing problem is very similar to typical path constrained path optimization (PCPO) problems, which are proved to be NP-complete. Hence we present a heuristic solution for the aforesaid problem. We...
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