Marcelo Segura | University of Southern California (original) (raw)

Papers by Marcelo Segura

Distributed beam‐forming using an array of wirelessly self‐synchronized nodes.

IEEE Latin America Transactions, 2019

This work proposes an improved Real Time Localization System using UWB technology, for people and... more This work proposes an improved Real Time Localization System using UWB technology, for people and asset tracking in a closed environment, particularly in underground mines. The UWB technology has demonstrated a very good performance with a localization error margin below 41 centimeters. The main objective of this work was to develop an affordable, easy to use, and scalable localization system to detect people in underground mines that allows fast location and rescue in case of disaster. It can also improve the mine productivity under normal conditions. Different tests were carried out in mines and urban buildings to validate the design and evaluate the error margin. The test in an underground mine was done at “Casposo Mining”, which is located in the town of Calingasta, San Juan province, Argentina. Finally, an autonomy of 25 hours of continuous used was achieved using a 2000mAh battery.

Journal of Physics: Conference Series, 2013

2009 IEEE Latin-American Conference on Communications, 2009

Page 1. Wavelet Correlation TOA Estimation with Dynamic Threshold setting for IR-UWB Localization... more Page 1. Wavelet Correlation TOA Estimation with Dynamic Threshold setting for IR-UWB Localization System Marcelo J. Segura, Vicente A. Mut, Hector D. Patiño Institute of Automatics National University of San Juan, San Juan, Argentina. ...

2015 IEEE International Conference on Communications (ICC), 2015

Proceedings of the second workshop on Software radio implementation forum - SRIF '13, 2013

2009 IEEE International Workshop on Robotic and Sensors Environments, 2009

Page 1. Mobile Robot Self-Localization System using IR-UWB Sensor in Indoor Environments Marcelo ... more Page 1. Mobile Robot Self-Localization System using IR-UWB Sensor in Indoor Environments Marcelo J. Segura, Vicente A. Mut, Hector D. Patiño Institute of Automatics National University of San Juan, San Juan, Argentina. e-mail: {msegura; vmut; dpatino@inaut.unsj.edu.ar} ...

IET Radar Sonar & Navigation, 2012

Multimedia applications like high definition digital television push the manufacturers to increas... more Multimedia applications like high definition digital television push the manufacturers to increase available bandwidth mainly in Powerline Communication (PLC) links. Because of this needs in this work a PLC link control is developed to maximize the information rate meanwhile the bit error rate (BER) is maintained under a desired reference limit. The developed control system has a unique variable called minimal total distance and the feedback loop signal is estimated from the low-density parity check (LDPC) decoder iterations. These mentioned characteristics enable a fast and simple control scheme. In order to evaluate the control system behavior a complete Powerline (PL) link was modeled in a matrix form and simulated with a measured PL channel model and with an additive white Gaussian noise (AWGN) channel. The implemented PL link reaches 570 Mbps in AWGN. Finally the BER control shows a good response under a severe random walk SNR channel variation.

In impulse-based UWB systems, positional accuracy is inversely proportional to the signal bandwid... more In impulse-based UWB systems, positional accuracy is inversely proportional to the signal bandwidth. In this work, a number of anchor nodes are located at fixed positions in an indoor environment transmitting synchronized 2.5ns pulses with Differential Binary Phase Shift Keying (DBPSK) modulation. An UWB receiver mounted on a mobile robot utilizes Time Difference of Arrival (TDOA) between pairs of synchronized transmitting anchor nodes for localization. Self-localization implies that position estimation algorithms run locally on the mobile robot. A prototype non-coherent UWB receiver using off-the-shelf components is implemented where signal acquisition runs on a Field Programmable Gate Array (FPGA). Measurement results indicate sub-20cm positional accuracy with Line Of Sight (LOS) and Non-Line of Sight (NLOS) conditions relative to fixed anchor nodes in a typical indoor environment.

Nowadays the need for dealing with ultra-high speed Analog to Digital Converter (ADC) is becoming... more Nowadays the need for dealing with ultra-high speed Analog to Digital Converter (ADC) is becoming more and more common, from Telecommunications to Precise Instrumentation, every application is increasing the analog to digital interface data rate. The ultra-high sampling rate of the ADCs demands the use of advanced acquisition techniques as well as the latest technology available. The utilization of dedicated Application Specific Integrated Circuit (ASIC) is an expensive solution to deal with the very high throughput from the ADC and its lack of flexibility is a huge drawback. On the other hand, the technology, the architecture and the state-of-the art of the current Field Programmable Gate Arrays (FPGAs) make them especially suitable to act as interface between an ultra-high speed ADC and a data processing unit. Another extra advantage is the reconfigurability of the FPGAs, they can be quickly adapted to different ADCs or different data processing units. The purpose of this paper is to present a practical approach to interface an ultra-high speed 8-bit ADC, MAX104, from Maxim Integrated Circuit, which performs digitalization of the input signal with a sampling rate of 1Gsps and a commercial and popular FPGA, the Virtex2 Pro, from Xilinx Corporation. Once the ADC digital data have been acquired, then they can be processed by either the dedicated FPGA Digital Signal Processing (DSP) blocks, or the FPGA embedded processors or just send the data out to a PC for later processing. Hence, the proposed method of implementation can be used as front-end of a wide range of applications.