VII International Telecommunications Symposium

In this paper, we propose a new analytical expression for estimating byte loss probability at a single server queue with multi-scale traffic arrivals using Pareto distribution. In order to make the estimation procedure numerically tractable without losing the accuracy, we assume and demonstrate that an exponential model is adequate for representing...

This contribution introduces a robust version of the multicarrier equalization by restoration of redundance (MERY) algorithm for data communication through power line communication (PLC) channel corrupted by impulsive noise. The novelty is the introduction of a nonlinear and differentiable function into the cost function of MERRY algorithm. As...

The integrated system of data transmission, encoding, modulation and block channels are projected in dependent ways with the purpose of getting an integrated action from those elements, and the elimination of additional devices with incompatibility treatment, caused by inadequate choice of some those components. In this system, the modulation and...

It is investigated the performance of legacy IEEE 802.11a time synchronization algorithms when the synchronization preamble is transmitted by IEEE 802.11n devices with multiple transmitting antennas using cyclic shift diversity. It is concluded that the backward compatibility is achieved when the time synchronization is implemented using...

The traditional traffic models which are based on conventional telephone traffic are not suitable for modeling selfsimilar traffic on computer networks. Therefore, emphasis has been put on self-similarity characteristics. This paper presents a model which can be used to compare, simulate and estimate the packet traffic distribution on computer networks.

In many image applications the measurement of visual quality is of special importance. Most of the Full-Reference metrics proposed address the evaluation of grayscale images. This paper investigates an application of two grayscale metrics for the evaluation of color images using CIELAB color space. It also proposes the utilization of an important...

Use of surface-plasmons-polaritons has become a potential way to develop optical components below the diffraction limit. This paper reports the feasibility of some plasmonpolariton waveguides in optical communication systems. Combinations of metal elements of different geometry are theoretically analyzed. They can serve as building blocks in future...

It is shown analytical and measurement results in order to compare five different indoor path loss propagation models in industrial environments: one-slope; dual-slope; partitioned; Cost-231 multi-wall model and average walls. It is concluded that the dual slope propagation model allows a better estimation among the selected models because...

This paper proposes two methods for acoustic ambient noises classification. The classification is based on the Kurtosis coefficient and the Bhattacharyya distance. Five colored acoustic noises, some captured in different environments and a White artificially generated, were used to perform the classification methods. These noises were obtained from...

This paper investigates the performance of the multidimensional multiscale parser (MMP) algorithm for speech coding. A new prediction-based scheme is considered, where the MMP algorithm operates on the associated prediction-error signal instead of the original speech signal. Other features are considered, such as: nonuniform quantization of MMP...