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In this paper an efficient method for downstream bit rate calculation on ADSL2+ local loops limited by crosstalk is presented. Crosstalk is one of the most limiting factors in broadband cable communications. In order to calculate bit rate of ADSL2+ loops we have done an in-depth analysis of a local telecom operator's cable infrastructure in terms of crosstalk. On the basis of measurements carried...
Third generation network operators are facing the issue of having to introduce new, personalized services to their users, while at the same time they have to increase revenue and cut down the operating costs to survive the increasing competition on the telecom market. Intelligent software agents can act on behalf of the network operator to allow the operator much more flexibility and a quicker adaptation...
The problem of securing data communications in civil and commercial space missions has been debated within the Security Working Group of the Consultative Committee for Space Data Systems since several months. In the context of Telecommand transmissions, the interest is mainly focused on authentication, more than encryption. The object of this paper is to investigate the applicability of a standard...
Existing header compression systems, like ROHC, try to compress all headers in protocol stack together, using monolithic profiles. The distributed profiles concept is introduced recently, used to compress protocol headers individually. In this paper, the research for optimal format indication for distributed profiles is presented. After concluding that per protocol CRC and padding are obsolete, the...
In this paper, a number of powerful recent classes of turbo like codes are analyzed as possible candidates for the upcoming DVB Standards. The final selection is justified in terms of the best tradeoff between complexity and performance. One of these classes has been recently proposed by the authors in the framework of their ongoing work on the technologies, requested by the DVB Project, which could...
This paper proposes a method to improve the performance of a low-density parity-check code, by selectively removing some cycles from the associated bipartite graph. The method is based on a modified version of breadth-first search (BFS) algorithm, that we call modified BFS (MBFS). Throughout the paper we will give a detailed description of the algorithm and analytically study its complexity. Simulation...
In QoS enabled IP-based networks, QoS signaling and policy control are used to control the access to network resources and their usage. The IETF proposed standard protocol for policy control is Common Open Policy Service (COPS) protocol, which has also been adopted in 3GPP IP Multimedia Subsystem (IMS) Release 5. This paper presents a prototype for policy-controlled IPv4/IPv6 network emulation environment,...
The telecommunication industry has been through disruptive times, but data networking service revenue has continued to rise. Services such as frame relay (FR), asynchronous transfer mode (ATM) and IP virtual private networks (IP VPN) are growing in terms of use and revenues and the signs are that the legacy layer 2 services are growing, and part of the reason for this is the emergence of a strong...
Since satellite channel can be used as a part of an heterogeneous network, researchers attention is focused on the optimization of the use of that resource. Unfortunately, protocols studied for wired traditional network, and widely used for Internet services, performs very poorly on this transmission medium, in particular the TCP. In the last years a lot of works have been published about this topic,...
Quality of service (QoS) support in the current Internet is indispensable because of QoS-sensitive real-time applications such as voice-over-IP, IP-TV, video conferencing, online gaining etc. Since the introduction of the differentiated services (Diff-Serv) architecture there has been considerable work reported in literature on its performance evaluation. However, none of them have addressed the basic...
In this work we propose a data dissemination protocol for multisink wireless sensor networks, based on a colored area concept related to the nodes coverage area and on geographic multiple sinks locations. We investigate how the inter-nodes distance definition could affect the protocol performance; in particular we introduce two distance metrics (the classic Euclidean and a metric that takes into account...
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