Loading [MathJax]/extensions/MathMenu.js
Omar Longoria-Gandara - IEEE Xplore Author Profile
Subscribe
ADVANCED SEARCH

Author details

< Back

Omar Longoria-Gandara

Also published under: O. Longoria-Gandara, Omar H. Longoria-Gandara

Publications
21
Citations
77
Publications by Year
20072024
Co-Authors:
Show All Co-Authors (35)
Image of author Omar Longoria-Gandara

Omar Longoria-Gandara

Also published under: O. Longoria-Gandara, Omar H. Longoria-Gandara

Affiliation

DIIS
Universidad de Zaragoza
Zaragoza, Spain

Publication Topics

Biography

Omar Longoria-Gandara (Member, IEEE) was born in Delicias, Mexico, in 1971. He received the B.Sc. degree in electronics and communications from the Instituto Tecnolgico y de Estudios Superiores de Monterrey, Monterrey, Mexico, in 1993, the M.Sc. degree in electrical engineering specialized in communications from the Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico, in 1998, and the Ph.D. degree from CINVESTAV-IPN in 2010, with research in time-invariant/variant MIMO channel estimation, radio channel modeling, and space–time block codes.,From 1998 to 2006, he was with the Electrical Engineering Department, ITESM-Guadalajara, Zapopan, Mexico, as a full-time Professor and f...
Publications
21
Citations
77
Publications by Year
20072024
Co-Authors:
Show All Co-Authors (35)
Author's Published Works

Showing 1-21 of 21 results

  • Sort

Filter Results

Show

Sort By

Results

Efficient Optimal Linear Estimation for CPM: An Information Fusion Approach

Rodrigo Aldana-López;Jose Valencia-Velasco;Omar Longoria-Gandara;Javier Vázquez-Castillo;Luis Pizano-Escalante

IEEE Internet of Things Journal
Year: 2024 | Volume: 11, Issue: 5 | Journal Article |
The Internet of Things (IoT) has recently experienced considerable growth, enabling communication between a wide range of devices. Given the prevalence of mobile IoT devices, optimizing hardware resources becomes crucial, requiring power and complexity reduction strategies. Continuous phase modulation (CPM) offers attractive features for IoT, such as spectral and power efficiency. However, many CP...Show More

Efficient Optimal Linear Estimation for CPM: An Information Fusion Approach

Rodrigo Aldana-López;Jose Valencia-Velasco;Omar Longoria-Gandara;Javier Vázquez-Castillo;Luis Pizano-Escalante

Year: 2024 | Volume: 11, Issue: 5 | Journal Article |

A Multi-Stage CTLE Design and Optimization for PCI Express Gen6.0 Link Equalization

Karla G. López-Araiza;Francisco E. Rangel-Patiño;Jorge E. Ascencio-Blancarte;Edgar A. Vega-Ochoa;José E. Rayas-Sánchez;Omar Longoria-Gandara

2023 IEEE Latin American Electron Devices Conference (LAEDC)
Year: 2023 | Conference Paper |
Cited by: Papers (2)
The continuously increasing bandwidth demand from new applications has led to the development of the new peripheral component interconnect express (PCIe) Gen6, reaching data rates of 64 giga-transfers per second (GT/s) and adopting the pulse amplitude modulation 4-level (PAM4) signaling scheme. While PAM4 solves the bandwidth requirements, it brings new challenges for the physical channel design. ...Show More

A Multi-Stage CTLE Design and Optimization for PCI Express Gen6.0 Link Equalization

Karla G. López-Araiza;Francisco E. Rangel-Patiño;Jorge E. Ascencio-Blancarte;Edgar A. Vega-Ochoa;José E. Rayas-Sánchez;Omar Longoria-Gandara

Year: 2023 | Conference Paper |

Modular Arithmetic CPM for SDR Platforms

Abisaí Ramírez-Pérez;Rodrigo Aldana-López;Omar Longoria-Gandara;Jose Valencia-Velasco;Luis Pizano-Escalante;Ramon Parra-Michel

IEEE Transactions on Circuits and Systems II: Express Briefs
Year: 2022 | Volume: 69, Issue: 4 | Journal Article |
Cited by: Papers (3)
This brief presents a new Continuous Phase Modulation (CPM) module for multi- $h$ transmission based on modular arithmetic processing. It is well known that CPM systems are sensitive to changes in the modulation index, which is implied when fixed-point format is used in the hardware implementation. In this scenario, modular arithmetic allows a more accurate signal processing regarding SQNR perfor...Show More

Modular Arithmetic CPM for SDR Platforms

Abisaí Ramírez-Pérez;Rodrigo Aldana-López;Omar Longoria-Gandara;Jose Valencia-Velasco;Luis Pizano-Escalante;Ramon Parra-Michel

Year: 2022 | Volume: 69, Issue: 4 | Journal Article |

Transmitter and Receiver Equalizers Optimization for PCI Express Gen6.0 based on PAM4

Roberto J. Ruiz-Urbina;Francisco E. Rangel-Patiño;José E. Rayas-Sánchez;Edgar A. Vega-Ochoa;Omar H. Longoria-Gandara

2020 IEEE MTT-S Latin America Microwave Conference (LAMC 2020)
Year: 2021 | Conference Paper |
Cited by: Papers (4)
The continuously increasing bandwidth demand from new applications has led to the development of the new PCIe Gen6, reaching data rates of 64 GT/s and adopting PAM4 modulation scheme. While PAM4 solves the bandwidth constraint in high-speed interconnects, it brings new challenges for the physical channel analysis. Equalization (EQ) plays an important role even with PAM4 signaling. PCIe specificati...Show More

Transmitter and Receiver Equalizers Optimization for PCI Express Gen6.0 based on PAM4

Roberto J. Ruiz-Urbina;Francisco E. Rangel-Patiño;José E. Rayas-Sánchez;Edgar A. Vega-Ochoa;Omar H. Longoria-Gandara

Year: 2021 | Conference Paper |

Low-Complexity Maximum-Likelihood Detector for IoT BLE Devices

Jose Valencia-Velasco;Omar Longoria-Gandara;Rodrigo Aldana-Lopez;Luis Pizano-Escalante

IEEE Internet of Things Journal
Year: 2020 | Volume: 7, Issue: 6 | Journal Article |
Cited by: Papers (6)
Internet of Things (IoT) is a technology that has overgrown and whose interest lies in the connection of diverse kinds of devices to collect and exchange data. Since most IoT devices are mobile, the hardware resources are hard limited; thus, complexity reduction becomes a relevant concern in this context. Bluetooth low energy (BLE) communication standard has an important position in IoT due to its...Show More

Low-Complexity Maximum-Likelihood Detector for IoT BLE Devices

Jose Valencia-Velasco;Omar Longoria-Gandara;Rodrigo Aldana-Lopez;Luis Pizano-Escalante

Year: 2020 | Volume: 7, Issue: 6 | Journal Article |

Simulation Model to Predict BER Based on S-Parameters of High-Speed Interconnects

L. Pizano-Escalante;O. Longoria-Gandara;R. Parra-Michel;F. Peña-Campos

IEEE Design & Test
Year: 2019 | Volume: 36, Issue: 1 | Magazine Article |
Cited by: Papers (2)
This work aims to predict bounds on bit-error-rate performance of highspeed interconnects. The novelty lies in the characterization of timing jitter to achieve more accurate modeling of such interconnects.Show More

Simulation Model to Predict BER Based on S-Parameters of High-Speed Interconnects

L. Pizano-Escalante;O. Longoria-Gandara;R. Parra-Michel;F. Peña-Campos

Year: 2019 | Volume: 36, Issue: 1 | Magazine Article |

Alternative Viterbi Detection Metrics for GFSK Receivers: A Hardware Reduction Approach

Jose Valencia-Velasco;Rodrigo Aldana-Lopez;Omar Longoria-Gandara

2018 IEEE 10th Latin-American Conference on Communications (LATINCOM)
Year: 2018 | Conference Paper |
Cited by: Papers (3)
Gaussian frequency shift keying (GFSK)is a digital modulation scheme with both attractive spectra and high power efficiencies. Modulation schemes with these characteristics often require a maximum likelihood sequence estimator (MLSE)implemented by means of Viterbi Algorithm (VA). The main drawback of VA is complexity implementation due to the filter bank needed to calculate the metrics, the large ...Show More

Alternative Viterbi Detection Metrics for GFSK Receivers: A Hardware Reduction Approach

Jose Valencia-Velasco;Rodrigo Aldana-Lopez;Omar Longoria-Gandara

Year: 2018 | Conference Paper |

IEEE-754 Half-Precision Floating-Point Low-Latency Reciprocal Square Root IP-Core

Cuauhtémoc R. Aguilera-Galicia;Omar Longoria-Gandara;Oscar A. Guzmán-Ramos;Luis Pizano-Escalante;Javier Vázouez-Castillo

2018 IEEE 10th Latin-American Conference on Communications (LATINCOM)
Year: 2018 | Conference Paper |
Cited by: Papers (3)
In different matrix-decomposition techniques for wireless-communication systems, the reciprocal square root (RSR) is a fundamental and recurrent operation, as well in gaming and signal processing systems computation of the RSR is required. Most reported RSR architectures are focused on accelerating high-precision floating-point (FP) units. The IEEE 754-2008 half-precision FP standard offers larger...Show More

IEEE-754 Half-Precision Floating-Point Low-Latency Reciprocal Square Root IP-Core

Cuauhtémoc R. Aguilera-Galicia;Omar Longoria-Gandara;Oscar A. Guzmán-Ramos;Luis Pizano-Escalante;Javier Vázouez-Castillo

Year: 2018 | Conference Paper |

Half-Precision Floating-Point Multiplier IP Core Based on 130 Nm CMOS ASIC Technology

Cuauhtémoc R. Aguilera-Galicia;Omar Longoria-Gandara;Luis Pizano-Escalante

2018 IEEE 10th Latin-American Conference on Communications (LATINCOM)
Year: 2018 | Conference Paper |
Cited by: Papers (3)
Internet of things applications demand reusable modular designs with low-power consumption. Furthermore, many emerging applications, such as image recognition using machine learning, are low-accuracy tolerant. For these applications, the IEEE-754 half-precision arithmetic is becoming a relevant option for low-power, low-computational cost designs. This article presents a half-precision floating-po...Show More

Half-Precision Floating-Point Multiplier IP Core Based on 130 Nm CMOS ASIC Technology

Cuauhtémoc R. Aguilera-Galicia;Omar Longoria-Gandara;Luis Pizano-Escalante

Year: 2018 | Conference Paper |

Modeling of microstrip interconnects with cylindrical sub-conductors

C. H. Rodriguez;J. L. Naredo;O. Longoria-Gandara;R. Parra-Michel

2018 IEEE 9th Latin American Symposium on Circuits & Systems (LASCAS)
Year: 2018 | Conference Paper |
Multiconductor Transmission line (MTL) representations are often used to analyze and simulate high-speed interconnects in PCBs and IC packages. These representations require determining RLCG parameters from interconnect geometries and material properties. This paper proposes a method based on the Partial Sub-Conductors Equivalent Circuit (PSEC) to determine these parameters. As opposed to other PS...Show More

Modeling of microstrip interconnects with cylindrical sub-conductors

C. H. Rodriguez;J. L. Naredo;O. Longoria-Gandara;R. Parra-Michel

Year: 2018 | Conference Paper |

Post-silicon validation based on synthetic test patterns for early detection of timing anomalies

Eduardo Garcia-Espinosa;Omar Longoria-Gandara;Enrique Gonzalez-Garcia;Arturo Veloz-Guerrero

2018 IEEE 19th Latin-American Test Symposium (LATS)
Year: 2018 | Conference Paper |
Timing anomalies in a system on a chip are one of the most common causes of functional misbehaviors. They are usually hard to find and poses a potential quality risk to the design and implementation of the system. Such anomalies might appear when high-volume validation is performed in the design, which usually takes place at advanced stages of the validation process and close to the product releas...Show More

Post-silicon validation based on synthetic test patterns for early detection of timing anomalies

Eduardo Garcia-Espinosa;Omar Longoria-Gandara;Enrique Gonzalez-Garcia;Arturo Veloz-Guerrero

Year: 2018 | Conference Paper |

A low-complexity near-ML detector for a 3 × nR hybrid space-time code

Joaquin Cortez;Miguel Bazdresch;Omar Longoria-Gandara

2017 IEEE 9th Latin-American Conference on Communications (LATINCOM)
Year: 2017 | Conference Paper |
Cited by: Papers (2)
In a MIMO wireless communications system, a space-time block code specifies how the data symbols are transmitted over different antennas at different time instants. A hybrid space-time code attempts to obtain some of the available diversity and multiplexing gains, achieving low error probability and high data rate. The LD StBc-VBLAST hybrid code layers one spatial-multiplexing antenna (to increase...Show More

A low-complexity near-ML detector for a 3 × nR hybrid space-time code

Joaquin Cortez;Miguel Bazdresch;Omar Longoria-Gandara

Year: 2017 | Conference Paper |

A novel function segmentation methodology for implementing affordable channel emulators

J. M. Trejo-Arellano;J. Vázquez-Castillo;O. Longoria-Gandara;C. A. Gutiérrez;R. Carrasco-Alvarez;A. Castillo-Atoche

2016 IEEE MTT-S Latin America Microwave Conference (LAMC)
Year: 2016 | Conference Paper |
Nowadays, wireless channel emulators are designed for channel models that require the evaluation of logarithmic, trigonometric, exponential, and other transcendental functions. These channel emulators are used for testing wireless communication standards associated to Weibull, Suzuki, Nakagami, Rayleigh and Gaussian distributions. The piecewise polynomial approximation (PPA) technique allows the e...Show More

A novel function segmentation methodology for implementing affordable channel emulators

J. M. Trejo-Arellano;J. Vázquez-Castillo;O. Longoria-Gandara;C. A. Gutiérrez;R. Carrasco-Alvarez;A. Castillo-Atoche

Year: 2016 | Conference Paper |

Hearing aid devices for smart cities: A survey

E. Garcia-Espinosa;O. Longoria-Gandara;A. Veloz-Guerrero;G. G. Riva

2015 IEEE First International Smart Cities Conference (ISC2)
Year: 2015 | Conference Paper |
Cited by: Papers (4)
Hearing loss population has increased in recent years. Hearing aid technology has evolved in the last decade but the percentage of users of such devices remains very low. With the advent of wireless communication protocols such as Bluetooth Low Energy (BLE), along with the exponential growth of smart phone demand, it is expected an increment of the users of hearing aid devices due to the new use c...Show More

Hearing aid devices for smart cities: A survey

E. Garcia-Espinosa;O. Longoria-Gandara;A. Veloz-Guerrero;G. G. Riva

Year: 2015 | Conference Paper |

Fast fixed-point divider based on Newton-Raphson method and piecewise polynomial approximation

A. Rodriguez-Garcia;L. Pizano-Escalante;R. Parra-Michel;O. Longoria-Gandara;J. Cortez

2013 International Conference on Reconfigurable Computing and FPGAs (ReConFig)
Year: 2013 | Conference Paper |
Cited by: Papers (10)
Division is an operation extensively used in architectures for digital signal processing algorithms, which in portable devices require an implementation using fixed-point format. In this paper, a novel fixed-point divider is proposed. The divider architecture is based on a division algorithm that uses the reciprocal operation and a post-multiplication. In turn, reciprocal operation is based on the...Show More

Fast fixed-point divider based on Newton-Raphson method and piecewise polynomial approximation

A. Rodriguez-Garcia;L. Pizano-Escalante;R. Parra-Michel;O. Longoria-Gandara;J. Cortez

Year: 2013 | Conference Paper |

Crosstalk Cancellation on High-Speed Interconnects Through a MIMO Linear Precoding

L. Pizano-Escalante;O. Longoria-Gandara;R. Parra-Michel;J. L. Naredo

IEEE Transactions on Microwave Theory and Techniques
Year: 2013 | Volume: 61, Issue: 11 | Journal Article |
Cited by: Papers (2)
One of the main problems of multiple-input multiple-output (MIMO) high-speed interconnect (HSI) circuits that use single-ended signaling is crosstalk phenomena. Crosstalk is an unintentional coupling of the transmitted signals due to close spacing between transmission lines that distorts the information bearing symbols. A novel model for uniform or nonuniform multiconductor transmission line based...Show More

Crosstalk Cancellation on High-Speed Interconnects Through a MIMO Linear Precoding

L. Pizano-Escalante;O. Longoria-Gandara;R. Parra-Michel;J. L. Naredo

Year: 2013 | Volume: 61, Issue: 11 | Journal Article |

An efficient Gaussian random number architecture for MIMO channel emulators

J. Vazquez Castillo;A. Castillo Atoche;O. Longoria-Gandara;R. Parra-Michel

2011 IEEE Workshop on Signal Processing Systems (SiPS)
Year: 2011 | Conference Paper |
Cited by: Papers (3)
Gaussian random numbers (GRN) generators are indispensable components in channel emulators for producing multiplicative and additive noises. Efficient designs of these GRN generators are required for testing the newest communications standards, which consider multiple channels working at higher data rates. In this paper, a new reconfigurable architecture for the generation of GRN at each clock cyc...Show More

An efficient Gaussian random number architecture for MIMO channel emulators

J. Vazquez Castillo;A. Castillo Atoche;O. Longoria-Gandara;R. Parra-Michel

Year: 2011 | Conference Paper |

Estimation of Correlated MIMO Channels using Partial Channel State Information and DPSS

O. Longoria-Gandara;R. Parra-Michel

IEEE Transactions on Wireless Communications
Year: 2011 | Volume: 10, Issue: 11 | Journal Article |
Cited by: Papers (15)
A novel approach is proposed for correlated multiple-input multiple-output (MIMO) channel estimation based on reduced-rank (RR) technique and partial channel state information (CSI). In contrast to previous proposals that used the channel correlation matrix (CCM) and its eigendecomposition, this paper shows that close linear minimum mean-square-error (LMMSE) performance can be achieved with the us...Show More

Estimation of Correlated MIMO Channels using Partial Channel State Information and DPSS

O. Longoria-Gandara;R. Parra-Michel

Year: 2011 | Volume: 10, Issue: 11 | Journal Article |

A Hardware-Efficient Frequency Domain Correlator Architecture for Acquisition Stage in GPS

E. Romero-Aguirre;R. Parra-Michel;O. Longoria-Gandara;M. Aguirre-Hernández

2010 International Conference on Reconfigurable Computing and FPGAs
Year: 2010 | Conference Paper |
Cited by: Papers (2)
A frequency domain correlator (FDC) with low-complexity architecture is proposed. This signal processing module is part of FFT-based acquisition stage of a global position system (GPS). The FDC is based on a single reconfigurable core capable of computing both decimation in frequency radix-2 (DIF-2) fast Fourier transform (FFT) and decimation in time radix-2 (DIT-2) inverse fast Fourier transform ...Show More

A Hardware-Efficient Frequency Domain Correlator Architecture for Acquisition Stage in GPS

E. Romero-Aguirre;R. Parra-Michel;O. Longoria-Gandara;M. Aguirre-Hernández

Year: 2010 | Conference Paper |

Iterative Mean Removal Superimposed Training for Frequency Selective Channel Estimation

O. Longoria-Gandara;R. Parra-Michel;M. Bazdresch;A. G. Orozco-Lugo

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing
Year: 2008 | Conference Paper |
Cited by: Papers (1)
The topic of channel estimation for single-input single-output frequency-selective time-invariant channels has been recently addressed using superimposed training (ST) techniques. Improvement of these approaches using iterative algorithms has shown to achieve the best performance, although with the drawback of increasing computation complexity. In this work we propose a new iterative ST algorithm ...Show More

Iterative Mean Removal Superimposed Training for Frequency Selective Channel Estimation

O. Longoria-Gandara;R. Parra-Michel;M. Bazdresch;A. G. Orozco-Lugo

Year: 2008 | Conference Paper |

Linear Dispersion Codes Generation from Hybrid STBC-VBLAST Architectures

O. Longoria-Gandara;A. Sanchez-Hernandez;J. Cortez;M. Bazdresch;R. Parra-Michel

2007 4th International Conference on Electrical and Electronics Engineering
Year: 2007 | Conference Paper |
Cited by: Papers (12)
Hybrid MIMO Systems are defined as a combination of architectures designed to achieve both multiplexing gain (such as VBLAST), and diversity gain, (such as STBC). In these systems the detection can be performed with an Ordered Successive Interference Cancellation (OSIC) based on SQRD algorithm, in which the layers with diversity are decoded first. In this paper we introduce a new way to represent ...Show More

Linear Dispersion Codes Generation from Hybrid STBC-VBLAST Architectures

O. Longoria-Gandara;A. Sanchez-Hernandez;J. Cortez;M. Bazdresch;R. Parra-Michel

Year: 2007 | Conference Paper |

IEEE Account

Purchase Details

Profile Information

Need Help?

A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
© Copyright 2025 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.