VII International Telecommunications Symposium

Inaccurate depth map discontinuities are an important source of artifact and distortion in multiview systems and applications requiring depth-based view rendering such as 3DTV or free-viewpoint video. Such errors along depth discontinuities frequently occur during depth estimation and/or depth map coding. In this paper we present a novel method for...

This work proposes a method for the evaluation of the effectiveness of adopting dynamic spectral management (DSM) algorithms in different DSL scenarios. In the last years several DSM algorithms emerged in the literature but their comparison has been typically conducted within few scenarios and considering specific operating points. This work...

Polarization division multiplexing systems is a promising technique, able to double the capacity of next generation optical communication systems. However, the most common employed algorithms to recover the sources from the received data have the drawback of losing sources when polarization dependent loss is present. To tackle this problem,...

This paper proposes optimal approaches integrating traffic engineering and protected network connection in Ethernet-over-WDM technology, analyzing to multi-ring and mesh network topologies. It is expected that management can benefit by multi-ring approaches but at a cost of more transceivers required due to its traffic routing constraints. However,...

n this paper, we propose two geographic routing metrics applied to wireless mesh networks that consider the use of channel width adaptation. The proposed metrics are evaluated through simulations jointly with a next hop channel width selection algorithm. The results show that the proposed metrics and algorithm generate greater throughput values...

Link adaptation is a process of paramount importance to optimize the performance of wireless communication systems. However, standardization committees have not standardized link adaptation procedures in order to foster competitiveness among vendors. As a consequence, many research projects have been conducted on this field and several strategies have...

This paper presents an tuning in SUI Propagation Model through the least squares algorithm. Data measurements were carried out in arboreous environments, in 12 amazon region cities containing broadband wireless networks on 5.8 GHz. The RMS error and standard deviation have been used as evaluation metrics. The results have shown a good agreement of...

This article presents an acoustic water leak detection system. It shows all the stages for doing acoustic leak signal processing and classification. The technique used for classification is support vector machine (SVM) using as features the Itakura mean and maximum distance and the larger projection of the principal component analysis (PCA). The...

Very often interested readers highlight documents with felt pens. Such marking may be seen as personal and physically “damaging” the original document, thus a recent taxonomy on noises on paper documents includes highlighting as a “physical noise”. This paper addresses ways of filtering out highlighting in paper documents.

A new fast algorithm for computing the discrete Hartley transform (DHT) is presented, which is based on the expansion of the transform matrix. The algorithm presents a better performance, in terms of multiplicative complexity, than previously known fast Hartley transform algorithms. A detailed description of the computation of DHTs with blocklengths...