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Network Functions Virtualization (NFV) is a new network paradigm that has been strongly promoted from both scientific community and telecom industry, where network functions (NFs) such as firewalls, load balancers, gateways among others, are virtualized, isolated from middleboxes and housed on one or more industry standard computing nodes. One of the main challenges for service providers when they...
This paper presents the problem of optimizing Radio Access Technology (RAT) selection and traffic offloading in a Multi RAT Heterogeneous Network composed by cellular and WiFi networks. The main idea is to distribute the traffic load of the system over the available access networks, while making an efficient use of the radio resources in the long-term. In this sense, a higher and fair WiFi resource...
Software defined Networks (SDN) is a paradigm that promises to facilitate the management of all types of networks, including the Wireless Mesh Networks (WMN). This integration enables an environment with enough resources and coverage to meet the demands of users, and thanks to a centralized network, resources can be managed in a better way. There are multiple simulators/emulators available, integrating...
In this paper, we address the problem of estimating channel impulse response (CIR) and carrier frequency offset (CFO) in OFDM systems utilizing the method of maximum likelihood. When the CFO is small, Moose's technique for CFO estimation is accurate and numerically efficient. However, if the CFO is high, there are no straightforward solutions for its estimation. We show that the log-likelihood function...
Telecommunications authorities are interested in knowing the real spectrum occupancy with the aid of several participants in the field of telecommunications. Therefore, several spectrum measurement campaigns have been made around the world. The results show a low spectrum occupancy leading to an inefficient use of the spectrum. This suggests the use of technologies like cognitive radio as a solution...
The prediction of adverse events in patient health has attracted researchers' attention for many years. Sensors in or on the body allow the continuous monitoring of patient's vital signs and their accurate analysis, supporting the generation of medical alerts. Exploring adverse event prediction only makes sense if medical alerts can be promptly transmitted to a hospital emergency response team. However,...
The trend towards the digitalization of our homes is motivated by the development of hardware and software platforms that have been researched in recent years. As in the Internet of Things, building a single, global platform that enables communication with a myriad of devices for home automation is virtually impossible. The platform proposed in this work deals, in isolation, with the problems in each...
The frequency-domain equalization techniques described by Tan & Stüber, Pancaldi & Vitetta, Van Thillo et al, and Williams & Saquib are applied to SOQPSK-TG and its PAM approximation using two principal pulses. A simple representative channel from aeronautical telemetry was used in computer simulations. For weak multipath (measured by a shallow spectral null) the equalizers displayed nearly...
This project will present a wireless sensors network. Each sensor node measures noise and CO2 pollution levels inside a specific urban area and a coordinator node stores these measurements in a database made with Java. Finally the obtained results are presented.
Asynchronous and cyclostationary impulsive noise can severely impact the bit-error-rate (BER) of OFDM-based powerline communication systems. In this paper, we analyze an adaptive nonlinear analog front end filter that mitigates various types of impulsive noise without detrimental effects such as self-interference and out-of-band power leakage caused by other nonlinear approaches like clipping and...
In recent years the use of wireless ad hoc networks has seen an increase of applications. A big part of the research has focused on Mobile Ad Hoc Networks (MAnETs), due to its implementations in vehicular networks, battlefield communications, among others. These peer-to-peer networks usually test novel communications protocols, but leave out the network security part. A wide range of attacks can happen...
Large Forest Fires are one of the most destructive and recurring natural disaster types around the world, and year after year they leave environmental, material and human irreparable losses in the social nuclei in which they occur. To face them, it is essential to have a Situation Awareness that allows decisions making according to reality, promoting the collaboration between the all involved and...
This paper presents a practical methodology for designing, implementing and deploying IPv6 networks. We use a virtual lab to simulate topologies for different scenarios. These topologies are designed programmatically and then, tested for connectivity and efficiency. In particular, these scenarios include translation mechanisms such as DNS64 and NAT64, tunneling mechanisms such as 6to4 and 6RD and...
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