This page has only limited features, please log in for full access.

Prof. Dr. Manuel Ortiz-López
University of Cordoba, Spain

Basic Info


Research Keywords & Expertise

0 Computer Arithmetic
0 Digital Electronics
0 Wireless Sensor Networks (WSN)
0 Computer Architectures and applications
0 Embedded and Real-Time Systems

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

Manuel Ortiz is Associate Professor at the Dept. of Electronics and Computers Engineering, University of Córdoba (Spain) since 1996. Received his M.Sc. in Physics Electronics, University of Granada, Spain, in 1987 and his PhD. Degree in the University of Cordoba in 2013. Since 1987 till 1996 he worked in the R&D department of Fujitsu, in the R&D of TECOSA (a Siemens group company) and for the department of Computer Communications&Networks in Telefonica. His research work is related to the development of low power embedded systems for use in sensor networks, the implementation of redundant arithmetic in FPGAs and HW/SW codesing. He has authored or co-authored several monographs, technical papers and articles covering topics on embedded system and wired and Wireless networks applied to communications for energy management systems and applications.

Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 30 November 2020 in Micromachines
Reads 0
Downloads 0

Current System-on-Chips (SoCs) execute applications with task dependency that compete for shared resources such as buses, memories, and accelerators. In such a structure, the arbitration policy becomes a critical part of the system to guarantee access and bandwidth suitable for the competing applications. Some strategies proposed in the literature to cope with these issues are Round-Robin, Weighted Round-Robin, Lottery, Time Division Access Multiplexing (TDMA), and combinations. However, a fine-grained bandwidth control arbitration policy is missing from the literature. We propose an innovative arbitration policy based on opportunistic access and a supervised utilization of the bus in terms of transmitted flits (transmission units) that settle the access and fine-grained control. In our proposal, every competing element has a budget. Opportunistic access grants the bus to request even if the component has spent all its flits. Supervised debt accounts a record for every transmitted flit when it has no flits to spend. Our proposal applies to interconnection systems such as buses, switches, and routers. The presented approach achieves deadlock-free behavior even with task dependency applications in the scenarios analyzed through cycle-accurate simulation models. The synergy between opportunistic and supervised debt techniques outperforms Lottery, TDMA, and Weighted Round-Robin in terms of bandwidth control in the experimental studies performed.

ACS Style

Salvador Ibarra-Delgado; Remberto Sandoval-Arechiga; José Ricardo Gómez-Rodríguez; Manuel Ortíz-López; María Brox. A Bandwidth Control Arbitration for SoC Interconnections Performing Applications With Task Dependencies. Micromachines 2020, 11, 1063 .

AMA Style

Salvador Ibarra-Delgado, Remberto Sandoval-Arechiga, José Ricardo Gómez-Rodríguez, Manuel Ortíz-López, María Brox. A Bandwidth Control Arbitration for SoC Interconnections Performing Applications With Task Dependencies. Micromachines. 2020; 11 (12):1063.

Chicago/Turabian Style

Salvador Ibarra-Delgado; Remberto Sandoval-Arechiga; José Ricardo Gómez-Rodríguez; Manuel Ortíz-López; María Brox. 2020. "A Bandwidth Control Arbitration for SoC Interconnections Performing Applications With Task Dependencies." Micromachines 11, no. 12: 1063.

Journal article
Published: 30 October 2020 in Electronics
Reads 0
Downloads 0

Smart lighting systems based on the Digital Addressable Lighting Interface (DALI) protocol are the most suitable for street lighting systems, allowing digital lighting control operations. Unfortunately, the microcontrollers, which are commonly used in the Wireless Sensor Network nodes to control the lamps, do not implement this protocol. The DALI protocol implemented by software in the microcontroller consumes hardware resources (timers), processing time and requires a precise temporal analysis of the application, due to the strict bit times and the Manchester coding that it uses. In this work, the design of a bridge is proposed to free the microcontroller from the implementation of the DALI protocol. The novelty of this work is the implementation of the DALI Bridge in a low-cost Field-Programmable Gate Array (FPGA) with low power consumption. The bridge has been described in the hardware description language following the 1076-93 and 1076.3-97 standards, to guarantee its portability. The results of the synthesis show that a minimum amount of logical and routing resources is used, that the power consumption is in the order of tens of mW, that it has a very small latency time and that it supports a high operating frequency, which allows adding new functions. Its operation is verified by implementing a wireless sensor node using an FPGA of the Lattice Semiconductor iCE40 family.

ACS Style

Oscar Ordaz-García; Manuel Ortiz-López; Francisco Quiles-Latorre; José Arceo-Olague; Roberto Solís-Robles; Francisco Bellido-Outeiriño. DALI Bridge FPGA-Based Implementation in a Wireless Sensor Node for IoT Street Lighting Applications. Electronics 2020, 9, 1803 .

AMA Style

Oscar Ordaz-García, Manuel Ortiz-López, Francisco Quiles-Latorre, José Arceo-Olague, Roberto Solís-Robles, Francisco Bellido-Outeiriño. DALI Bridge FPGA-Based Implementation in a Wireless Sensor Node for IoT Street Lighting Applications. Electronics. 2020; 9 (11):1803.

Chicago/Turabian Style

Oscar Ordaz-García; Manuel Ortiz-López; Francisco Quiles-Latorre; José Arceo-Olague; Roberto Solís-Robles; Francisco Bellido-Outeiriño. 2020. "DALI Bridge FPGA-Based Implementation in a Wireless Sensor Node for IoT Street Lighting Applications." Electronics 9, no. 11: 1803.

Journal article
Published: 01 September 2020 in IEEE Latin America Transactions
Reads 0
Downloads 0

Currently, embedded systems are composed of processors, memories, and Intellectual Property Cores (IP Cores) interconnected to develop a set of specific tasks. Therefore, the selection of an appropriate interconnection architecture is critical in terms of system performance and functionality. A Network-on-Chip provides an efficient and scalable interconnection solution when there are a large number of elements in the system. However, the bus-based interconnection system remains the best option to connect a few cores. The bus arbiter uses an allocation policy to select which IP Core obtains access to the bus. The so-called fair policies ensure that all processors in the system have the same opportunity to access the bus. However, they fail to offer a fair share of the bandwidth or transmission rate, especially when there are heterogeneous IP Cores. As a study case, we analyze an embedded aerospace system for earth observation. Different IP Cores preprocess satellite images at distinct execution times -and unbalanced processing ratesaffecting the delivery rate of images to earth. We study the phenomenon of uneven bus transmission rates due to improper bus allocation using policies such as Round Robin, FIFO, and Lottery. Also, we propose a metric to compute the maximum number of IP Cores without bus saturation.

ACS Style

Salvador Ibarra-Delgado; Remberto Sandoval-Arechiga; Maria Brox; Ortíz-López Ortiz-Lopez. Throughput Unfairness in Fair Arbitration Interconnection-Buses for Aerospace Embedded Systems. IEEE Latin America Transactions 2020, 18, 1606 -1613.

AMA Style

Salvador Ibarra-Delgado, Remberto Sandoval-Arechiga, Maria Brox, Ortíz-López Ortiz-Lopez. Throughput Unfairness in Fair Arbitration Interconnection-Buses for Aerospace Embedded Systems. IEEE Latin America Transactions. 2020; 18 (09):1606-1613.

Chicago/Turabian Style

Salvador Ibarra-Delgado; Remberto Sandoval-Arechiga; Maria Brox; Ortíz-López Ortiz-Lopez. 2020. "Throughput Unfairness in Fair Arbitration Interconnection-Buses for Aerospace Embedded Systems." IEEE Latin America Transactions 18, no. 09: 1606-1613.

Journal article
Published: 05 May 2019 in Energies
Reads 0
Downloads 0

More and more human activities are increasingly dependent on the power quality energy they are supplied. In particular, those loads that have an electronic switching mode power supply (SMPS) and microcontrollers or microprocessors are very susceptible to de-energization of the AC line as voltage monitoring takes place on the DC end and may not have enough time to cope with a voltage event involving energy loss. There have been many proposals that analyze power quality or current consumption, even those using limited resources hardware or the classic formulas of discrete root mean square (RMS). In this proposal, an approximation to the problem by means of an RMS value estimator that uses as a base a microcontroller of basic range and low economic cost and algorithms of calculation of very low computational cost that elude complex arithmetic operation to controllers, such as powers or roots, is presented. The results of the experiments to which the proposal was subjected show its ability to provide an estimation of the RMS value of voltage with sufficient precision or an event alarm in less time than the options analyzed. The validation tests and functional comparison of the prototype which were carried out support its viability.

ACS Style

Jose-Maria Flores-Arias; Manuel Ortiz-Lopez; Francisco J. Quiles Latorre; Francisco Jose Bellido-Outeiriño; Antonio Moreno-Muñoz. A Memory-Efficient True-RMS Estimator in a Limited-Resources Hardware. Energies 2019, 12, 1699 .

AMA Style

Jose-Maria Flores-Arias, Manuel Ortiz-Lopez, Francisco J. Quiles Latorre, Francisco Jose Bellido-Outeiriño, Antonio Moreno-Muñoz. A Memory-Efficient True-RMS Estimator in a Limited-Resources Hardware. Energies. 2019; 12 (9):1699.

Chicago/Turabian Style

Jose-Maria Flores-Arias; Manuel Ortiz-Lopez; Francisco J. Quiles Latorre; Francisco Jose Bellido-Outeiriño; Antonio Moreno-Muñoz. 2019. "A Memory-Efficient True-RMS Estimator in a Limited-Resources Hardware." Energies 12, no. 9: 1699.

Articles
Published: 14 July 2018 in International Journal of Electronics
Reads 0
Downloads 0

In power electronics, deterministic pulse width modulation strategies, aimed at reducing the emission of low-frequency harmonics (<2 kHz), resulting in the transfer of these emissions to the switching frequency and its multiples, in the kilohertz range. The impact of these spectral components is the main concern when studying electromagnetic interference from rectifiers with active power factor correction stage, commonly employed in LED lighting. These so-called supraharmonics (emission in the frequency range 2 to 150 kHz) are at the root of numerous problems in today’s smart distribution grids. Consequently, the standardisation organisations are currently reviewing the compatibility limits within this frequency range. Supraharmonics behave differently from (lower frequency) harmonics, as being reported in the literature. Fortunately, as will be proved further, it is possible to greatly reduce their presence, and at low computational cost, when methods like random pulse-width modulation are properly selected from the very beginning, avoiding the later need to use any mitigation technologies.

ACS Style

Joaquín Garrido-Zafra; Antonio Moreno-Munoz; Aurora Gil-De-Castro; Manuel A. Ortiz-López; Tomás Morales. Supraharmonics reduction in LED drivers via random pulse-position modulation. International Journal of Electronics 2018, 105, 2128 -2143.

AMA Style

Joaquín Garrido-Zafra, Antonio Moreno-Munoz, Aurora Gil-De-Castro, Manuel A. Ortiz-López, Tomás Morales. Supraharmonics reduction in LED drivers via random pulse-position modulation. International Journal of Electronics. 2018; 105 (12):2128-2143.

Chicago/Turabian Style

Joaquín Garrido-Zafra; Antonio Moreno-Munoz; Aurora Gil-De-Castro; Manuel A. Ortiz-López; Tomás Morales. 2018. "Supraharmonics reduction in LED drivers via random pulse-position modulation." International Journal of Electronics 105, no. 12: 2128-2143.

Extended abstract
Published: 01 January 2018 in Proceedings
Reads 0
Downloads 0

Precision agriculture can be defined as the science of using technology to improve the agricultural production. It is advisable for farmers to use a decision support system; in fact, real–time monitoring of climatic conditions is the only way to know the water needed by a cultivation. On the other hand, since the 1990s, a strong decrease of the Mediterranean Quercus has been observed in the pastures of southwestern Spain and Portugal, causing a high mortality of holm and cork oak trees. Among the factors associated with this decrease, the radical decomposition caused by Phytophthora Cinnamomi is remarkable for its gravity, which makes it necessary to reforest the trees and to monitor the microclimatic factors that have an influence on this regeneration. Wireless Sensor Networks (WSN) are a technology in full evolution and development, as well as their appropriate use in cultivations that help to implement ecological techniques. With these considerations in this work five units/nodes with one or more sensors that allow different environmental readings have been developed. In this work, the acquisition of data obtained from different sensors has been achieved, allowing the monitoring of climatic elements such as soil moisture, air quality, temperature and humidity, rainfall intensity, precipitation level, wind speed and direction, luminous flux and atmospheric pressure. A web page has been designed where the user can consult the climatic conditions of the cultivation or reforestation. Different devices interconnected with a central unit have been developed where measurements of the cultivation are sent for its later analysis by the farmer. The microclimatic data acquisition developed in the WSN proposed in this paper allows a farmer to make decisions about the irrigation of the cultivation, use of fertilizers, the development and maturation phases of the cultivated products, obtaining the optimum stages of cultivation and harvesting.

ACS Style

Carlos D. Moreno-Moreno; María Brox-Jiménez; Andrés A. Gersnoviez-Milla; Mariano Márquez-Moyano; Manuel A. Ortiz-López; Francisco J. Quiles-Latorre. Wireless Sensor Network for Sustainable Agriculture. Proceedings 2018, 2, 1302 .

AMA Style

Carlos D. Moreno-Moreno, María Brox-Jiménez, Andrés A. Gersnoviez-Milla, Mariano Márquez-Moyano, Manuel A. Ortiz-López, Francisco J. Quiles-Latorre. Wireless Sensor Network for Sustainable Agriculture. Proceedings. 2018; 2 (20):1302.

Chicago/Turabian Style

Carlos D. Moreno-Moreno; María Brox-Jiménez; Andrés A. Gersnoviez-Milla; Mariano Márquez-Moyano; Manuel A. Ortiz-López; Francisco J. Quiles-Latorre. 2018. "Wireless Sensor Network for Sustainable Agriculture." Proceedings 2, no. 20: 1302.

Journal article
Published: 29 December 2016 in Sensors
Reads 0
Downloads 0

Bees are very important for terrestrial ecosystems and, above all, for the subsistence of many crops, due to their ability to pollinate flowers. Currently, the honey bee populations are decreasing due to colony collapse disorder (CCD). The reasons for CCD are not fully known, and as a result, it is essential to obtain all possible information on the environmental conditions surrounding the beehives. On the other hand, it is important to carry out such information gathering as non-intrusively as possible to avoid modifying the bees’ work conditions and to obtain more reliable data. We designed a wireless-sensor networks meet these requirements. We designed a remote monitoring system (called WBee) based on a hierarchical three-level model formed by the wireless node, a local data server, and a cloud data server. WBee is a low-cost, fully scalable, easily deployable system with regard to the number and types of sensors and the number of hives and their geographical distribution. WBee saves the data in each of the levels if there are failures in communication. In addition, the nodes include a backup battery, which allows for further data acquisition and storage in the event of a power outage. Unlike other systems that monitor a single point of a hive, the system we present monitors and stores the temperature and relative humidity of the beehive in three different spots. Additionally, the hive is continuously weighed on a weighing scale. Real-time weight measurement is an innovation in wireless beehive—monitoring systems. We designed an adaptation board to facilitate the connection of the sensors to the node. Through the Internet, researchers and beekeepers can access the cloud data server to find out the condition of their hives in real time.

ACS Style

Sergio Gil-Lebrero; Francisco Javier Quiles-Latorre; Manuel Ortiz-López; Víctor Sánchez-Ruiz; Victoria Gámiz-López; Juan Jesús Luna-Rodríguez. Honey Bee Colonies Remote Monitoring System. Sensors 2016, 17, 55 .

AMA Style

Sergio Gil-Lebrero, Francisco Javier Quiles-Latorre, Manuel Ortiz-López, Víctor Sánchez-Ruiz, Victoria Gámiz-López, Juan Jesús Luna-Rodríguez. Honey Bee Colonies Remote Monitoring System. Sensors. 2016; 17 (12):55.

Chicago/Turabian Style

Sergio Gil-Lebrero; Francisco Javier Quiles-Latorre; Manuel Ortiz-López; Víctor Sánchez-Ruiz; Victoria Gámiz-López; Juan Jesús Luna-Rodríguez. 2016. "Honey Bee Colonies Remote Monitoring System." Sensors 17, no. 12: 55.

Journal article
Published: 27 April 2016 in Sensors
Reads 0
Downloads 0

Public lighting represents a large part of the energy consumption of towns and cities. Efficient management of public lighting can entail significant energy savings. This work presents a smart system for managing public lighting networks based on wireless communication and the DALI protocol. Wireless communication entails significant economic savings, as there is no need to install new wiring and visual impacts and damage to the facades of historical buildings in city centers are avoided. The DALI protocol uses bidirectional communication with the ballast, which allows its status to be controlled and monitored at all times. The novelty of this work is that it tackles all aspects related to the management of public lighting: a standard protocol, DALI, was selected to control the ballast, a wireless node based on the IEEE 802.15.4 standard with a DALI interface was designed, a network layer that considers the topology of the lighting network has been developed, and lastly, some user-friendly applications for the control and maintenance of the system by the technical crews of the different towns and cities have been developed.

ACS Style

Francisco José Bellido-Outeiriño; Francisco Javier Quiles-Latorre; Carlos Diego Moreno-Moreno; José María Flores-Arias; Isabel Moreno-García; Manuel Ortiz-López. Streetlight Control System Based on Wireless Communication over DALI Protocol. Sensors 2016, 16, 597 .

AMA Style

Francisco José Bellido-Outeiriño, Francisco Javier Quiles-Latorre, Carlos Diego Moreno-Moreno, José María Flores-Arias, Isabel Moreno-García, Manuel Ortiz-López. Streetlight Control System Based on Wireless Communication over DALI Protocol. Sensors. 2016; 16 (5):597.

Chicago/Turabian Style

Francisco José Bellido-Outeiriño; Francisco Javier Quiles-Latorre; Carlos Diego Moreno-Moreno; José María Flores-Arias; Isabel Moreno-García; Manuel Ortiz-López. 2016. "Streetlight Control System Based on Wireless Communication over DALI Protocol." Sensors 16, no. 5: 597.

Conference paper
Published: 01 January 2016 in 2016 IEEE International Conference on Consumer Electronics (ICCE)
Reads 0
Downloads 0

Nowadays, the automotive industry has increasingly to integrate electronic systems in cars, but it causes an important problem relating to their reliability. For getting that reliability better it is necessary a great cost using current methods and equipment. This paper explains an application that may help to reduce the cost for testing cars. Through the CAN bus our proposal can read the message sent by the car's control unit, then record, analyze and represent it. The proposed system has been designed, implemented and tested. Some of the experimental results are shown to illustrate its functionality.

ACS Style

J. M. Flores-Arias; M. Ortiz-Lopez; F. J. Quiles-Latorre; V. Pallarés; A. Chen. Complete hardware and software bench for the CAN bus. 2016 IEEE International Conference on Consumer Electronics (ICCE) 2016, 211 -212.

AMA Style

J. M. Flores-Arias, M. Ortiz-Lopez, F. J. Quiles-Latorre, V. Pallarés, A. Chen. Complete hardware and software bench for the CAN bus. 2016 IEEE International Conference on Consumer Electronics (ICCE). 2016; ():211-212.

Chicago/Turabian Style

J. M. Flores-Arias; M. Ortiz-Lopez; F. J. Quiles-Latorre; V. Pallarés; A. Chen. 2016. "Complete hardware and software bench for the CAN bus." 2016 IEEE International Conference on Consumer Electronics (ICCE) , no. : 211-212.