Marcelo Segura - Profile on Academia.edu (original) (raw)

Papers by Marcelo Segura

Simulation Results

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

Human Real Time Localization System in Underground Mines using UWB

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

Assistive Technology (AT) is an interdisciplinary research area that allows finding solutions for... more Assistive Technology (AT) is an interdisciplinary research area that allows finding solutions for individuals having a given disability[1] by easing or improving skills and functions in order to perform daily activities. A technology is regarded to be assistive whenever it fits well to the needs, skills and capabilities of the user, specifically by taking into account the intended activity and limitations arising in the context and environment where the person performs such activity. This work intends to solve the problems of vision-impaired persons in order to help them move autonomously through a city. To this aim, a prototype based as an FM device to transmit traffic lightsinformation to blind people is presented. Both the prototype design and its development are described, altogether withsteps and preliminary experiences. Results and conclusions show the perception levels and evaluation responsesstated by blind people, as well as thedrawbacks and advantages of the prototype.

Wavelet correlation TOA estimation with dynamic threshold setting for IR-UWB localization system

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

Accurate wireless timing synchronization has been an extremely important topic in wireless sensor... more Accurate wireless timing synchronization has been an extremely important topic in wireless sensor networks, required in applications ranging from distributed beam forming to precision localization and navigation. However, it is very challenging to realize, in particular when the required accuracy should be better than the runtime between the nodes. This work presents, to our knowledge for the first time, an experimental timing synchronization scheme that achieves a timing accuracy better than 5-ns rms in a network with 4 nodes. The experimental hardware is built from commercially available components and based on software-defined ultra-wideband transceivers. The protocol for establishing the synchronization is based on our recently developed "blink" protocol that can scale from the small network demonstrated here to larger networks of hundreds or thousands of nodes.

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

We present USC SDR, a wireless platform designed for easyto-program, high data rate, real time wi... more We present USC SDR, a wireless platform designed for easyto-program, high data rate, real time wireless experimentation. The design of our platform aims at removing most of the bottlenecks encountered in the design of current software radio architectures, e.g. the requirement to program new schemes in an FPGA, and the difficulty to run real-time experiments for a long time. The architecture combines generic PCI FPGA development boards with radio front-ends built as self-sufficient daughterboards. The daughterboards are connected to the FPGAs, which in turn are plugged into the PCIE slots of a general-purpose server.

Mobile robot self-localization system using IR-UWB sensor in indoor environments

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} ...

Sensors, 2011

In this work, a comparative study between an Ultra Wide-Band (UWB) localization system and a Simu... more In this work, a comparative study between an Ultra Wide-Band (UWB) localization system and a Simultaneous Localization and Mapping (SLAM) algorithm is presented. Due to its high bandwidth and short pulses length, UWB potentially allows great accuracy in range measurements based on Time of Arrival (TOA) estimation. SLAM algorithms recursively estimates the map of an environment and the pose (position and orientation) of a mobile robot within that environment. The comparative study presented here involves the performance analysis of implementing in parallel an UWB localization based system and a SLAM algorithm on a mobile robot navigating within an environment. Real time results as well as error analysis are also shown in this work.

IET Radar Sonar & Navigation, 2012

Typical indoor environments contain multiple walls and obstacles consisting of different material... more Typical indoor environments contain multiple walls and obstacles consisting of different materials. As a result, current narrowband radio frequency (RF) indoor navigation systems cannot satisfy the challenging demands for most indoor applications. The RF ultra wideband (UWB) system is a promising technology for indoor localisation owing to its high bandwidth that permits mitigation of the multipath identification problem. This work proposes a novel UWB navigation system that permits accurate mobile robot (MR) navigation in indoor environments. The navigation system is composed of two sub-systems: the localisation system and the MR control system. The main contributions of this work are focused on estimation algorithm for localisation, digital implementation of transmitter and receiver and integration of both sub-systems that enable autonomous robot navigation. For sub-systems performance evaluation, statics and dynamics experiments were carried out which demonstrated that the proposed system reached an accuracy that outperforms traditional sensors technologies used in robot navigation, such as odometer and sonar.

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.

A self-localized Ultra-Wide-Band (UWB) system that is suitable to navigate mobile robots in indoo... more A self-localized Ultra-Wide-Band (UWB) system that is suitable to navigate mobile robots in indoor environments is introduced. In impulse-based UWB systems, positional accuracy is inversely proportional to the signal bandwidth. In the work, a number of anchor nodes are located at fixed positions in an indoor environment transmitting synchronized 2ns 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 system 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.