XXXIII Simpósio Brasileiro de Telecomunicações

This paper proposes a new technique for solving sound source localization problems using time-difference of arrival (TDOA). The key aspect of the proposal relies on both the use of a median-based cost function, which allows for outlier filtering of misestimated TDOAs, and a TDOA discarding process. Simulation results indicate that the proposed...

Bufferbloat phenomenon is related to the excessive packet queuing in over-sized buffers inside the network that may lead to network performance degradation. In this context, we observe a lack of experimental results considering the practi- cal aspects of off-the-shelf network devices. In this paper, we present a systematic analysis of the...

Recently, two-dimensional techniques have been successfully employed for encoding surface-electromyography (S- EMG) records, through the use of commercial image encoders as an efficient alternative for that kind of signal. This paper presents an investigation regarding the performance of video and image encoders, when used for compressing S-EMG...

Spectrum sensing is an important tool for the expansion of cognitive radio. This paper evaluates the use of statistic tests to optimize the spectral detection of available frequency bands for opportunistic occupation. Statistical cha- racteristics of the transmitted signals over a channel subject to Nakagami-m fading are selected to achieve better...

The use of computational methods for the detec- tion of diseases related to the heart, has become increasingly important, since these diseases are added the largest cause of death in the world. Segmentation algorithms and analysis of electrocardiogram signal (ECG) allows speed and accuracy in the diagnosis of these diseases. Pan & Tompkins have...

This paper proposes distributed adaptive algorithmsbased on the conjugate gradient (CG) method and the consensus strategy for parameter estimation over sensor networks. In particular, we present a conventional distributed CG algorithm and a distributed CG algorithm that exploits sparsity in the set of parameters using l1 and log-sum penalty...

The electronic tags have increasingly been used to store product information, allowing automatic identification, product tracking, stock control and much more applications. Putting together RFID clothes tags and the Beacon technology (used to locate a client using a Smartphone) it is possible to improve client access to product information in a...

In this paper, we propose a multiple-input multiple- output (MIMO) communication scheme, optimized for feedback channel with low data rate. It is used a pre-processing based on the quantized information of phases and angles received a priori from the feedback channels. A full diversity bit error rate (BER) performance is obtained by the proposed...

n this paper, a technique for hiding musical scores in digital audio signals is described. The purpose is to provide for a user accessing the audio file of a music the respective musical score, which can be extracted by means of a systematic processing. The method employs musical scores written according to the ABC notation, which encodes the...

This article has the objective to describe the Ana- logical Front-End (AFE) developed to interface a power line communication (PLC) modem and the low-voltage electric power distribution network, considering that the data transmission occurs in the frequency band between 1.705 MHz and 50 MHz.