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The design of Networks-on-Chip (NoCs) components implies a wide range of techniques and methods to address the microarchitecture of the packet-forwarding components, where routers and switches are the most complex because they constitute the NoC’s backbone. Due to this complex design space, several works use approaches limiting architectural exploration, focusing only on achieving high-performance...Show More
Proper Power Azimuth Spectrum Estimation for MIMO Channels via Gans Mapping Inversion
R. Parra-Michel;A. Sanchez-Hernandez;C. Salas-Mier;A. Alcocer-Ochoa;R. Carrasco-Alvarez
The use of antenna arrays is indispensable in radar and multiple-input multiple-output (MIMO) wireless communications areas, as it permits the treatment of wavefronts in the spatial domain, enabling important applications such as beamforming and target detection. Spatial information is commonly given in terms of spatial correlation functions (SCFs), but its representation in terms of angular domai...Show More
Tunable Filtenna With DGS Loaded Resonators for a Cognitive Radio System Based on an SDR Transceiver
Ahmed A. Ibrahim;Hesham A. Mohamed;Alán Rodrigo Díaz Rizo;Ramon Parra-Michel;Hassan Aboushady
This paper introduces the design of a filtenna for cognitive radio systems. Four varactor diodes, which are inserted in the bandpass filter, are used to achieve the desired tunability. The proposed bandpass filter is integrated with a wideband monopole antenna. The bandpass filter is achieved by using two coupled defected ground structure (DGS) resonators and two coupled microstrip lines ended wit...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
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
Invariant Incoherent MIMO Reception Over Doubly Selective Channels
G. Ramirez-Arredondo;F. Peña-Campos;Ramon Parra-Michel;Valeri Kontorovich
Nowadays, there is a need for wireless communications to operate over a variety of scenarios, including high mobility multiple-input multiple-output (MIMO) applications, that bring along a challenging problem. In channels where Doppler spread and delay spread are high, complexity of coherent detectors and pilot overhead are both raised. This work proposes a non-coherent reception technique, easily...Show More
Statistical Methodology to Relocate Resonance Frequencies of Software Defined Radio Antennas
R. J. García-Dzul;C. H. Rodriguez;J. M. Trejo-Arellano;R. Parra-Michel
2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS)
Year: 2019 | Conference Paper |
Software Defined Radio (SDR) allows integrating different wireless communication standards such as GSM, Bluetooth, and ZigBee, using the same hardware. In this scenario the antenna should be able to operate at different frequency bands of the coexisting standards to maintain the SDR advantages and flexibility. This difficult task can be tackled through the use of matching networks (MN) circuits, w...Show More
MIMO Multicarrier Transmission Over Doubly Selective Channels With Virtual Trajectories Receiver
High mobility and multipath propagation induce Doppler and delay dispersion, respectively. When both phenomena affect the transmitted signal, the communication channel is known as a doubly selective channel (DSC). In multicarrier systems under this scenario, intersymbol interference (ISI) and intercarrier interference (ICI) are ineluctably present, severely degrading the system's performance. Ther...Show More
Mathematical models for the discordant size content replacement attack
Juan Jose Gomez-Ricardez;Ramon Parra-Michel;Jose Juan Garcia-Hernandez
2019 7th International Workshop on Biometrics and Forensics (IWBF)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
The incidence of attacks on audio signal self-recovery schemes has been growing. One of the more severe attacks is the discordant size content replacement attack. This attack replaces a set of samples of an audio signal with another set of samples of different sizes. This paper proposes a mathematical model of a communication channel subject to the discordant size content replacement attack. The g...Show More
Vehicular Scenario Simulation Methodology to Compute Time-Variant Statistics for V2V Channels
2018 IEEE 88th Vehicular Technology Conference (VTC-Fall)
Year: 2018 | Conference Paper |
This paper presents a ray-tracing simulator for a vehicle-to-vehicle (V2V) communication channel based on two-dimensional (2-D) scattering to obtain the angles of departure (AOD) and angles of arrival (AOA), from which the channel statistics are computed. The functionality of the simulator is exemplified with an overtaking scenario where the wireless radio channel exhibits a non-stationary behavio...Show More
Implementation methodology for Self-Timed modulators with dual-rail structures based on FPGA
L. A. Luna-Rodriguez;S. Ortega-Cisneros;E. Mascorro-Guardado;J. Rivera-Dominguez;R. Parra-Michel
2018 IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC)
Year: 2018 | Conference Paper |
Cited by: Papers (2)
The paper presents the implementation methodology for Self-Timed modulators and their synchronous equivalent. An OQPSK (Offset Quadrature Phase Shift Keying) modulator is used for the ZigBee standard, and is modified with the addition of asynchronous control blocks with dual-rail structures for removing the clock signal. A comparison of synchronous and asynchronous modulators was performed and the...Show More
Performance Evaluation of Turbo Decoding in DFTS-OFDM Systems Over V2V Channel
J.A. Del Puerto-Flores;Lennin C. Yllescas;R. Parra-Michel;F. Peña-Campos;Joaquin Cortez
2018 IEEE 10th Latin-American Conference on Communications (LATINCOM)
Year: 2018 | Conference Paper |
Cited by: Papers (4)
Vehicle-to-vehicle (V2V)doubly-dispersive channels cause loss of orthogonality in multi-carrier systems, resulting in inter-carrier interference (ICI). In order to suppress ICI in orthogonal frequency division multiplexing (OFDM)systems, the techniques of forward error correction (FEC)and nonlinear detection of data are usually employed, requiring low coding rates and high decoding computational c...Show More
Symmetrical to Asymmetrical Model Transformation for I/Q Imbalance in Zero-IF Transceivers
2018 IEEE 10th Latin-American Conference on Communications (LATINCOM)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Two main types of modeling are considered in the I/Q imbalance problem literature: symmetric models and asymmetrical models. Specifically, the symmetric models are applied in the I/Q imbalance testing area, while the asymmetrical models have applications in the I/Q imbalance calibration area; each model offers advantages in their respective areas, with applications in real systems. In this paper, ...Show More
Evaluation of OFDM Systems With Virtual Carriers Over V2V Channels
J.A. Del Puerto-Flores;R. Parra-Michel;F. Peña-Campos;Joaquin Cortez;E. Romero-Aguirre
2018 IEEE 9th Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Computational complexity and spectral efficiency are key components on the implementation of vehicular communication systems. However, in order to counteract the intercarrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) systems, it's usual to resort receivers with high computational complexity or reduced spectral efficiency. This paper analyzes the inclusion of virtual c...Show More
An all-digital physical and MAC layer architectures for a reconfigurable Bluetooth transmitter
J. M. Sánchez-Venegas;A. Ramírez-Pérez;R. Jaramillo-Ramírez;R. Parra-Michel
2018 IEEE 9th Latin American Symposium on Circuits & Systems (LASCAS)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Bluetooth (BT) is a standard that is massively used worldwide and continuously evolving. In addition, the upcoming increasing of internet of things considered BT as one of the main protocols that will support inter-devices connectivity. Hence, it is necessary to perform research on reconfigurable architectures that allow the rapid changes between new versions of this standard. In this paper, it is...Show More
A resource efficient symbol synchronizer implementation for the IEEE 802.11 protocol
L. Orozco-Galvan;R. Parra-Michel;F. Peña-Campos;R. Jaramillo-Ramirez;E. Romero-Aguirre
2018 IEEE 9th Latin American Symposium on Circuits & Systems (LASCAS)
Year: 2018 | Conference Paper |
Timing Synchronization is an unavoidable task during reception of wireless signals in coherent systems. In Orthogonal Frequency Division Multiplexing (OFDM) systems, like IEEE 802.11a and p, the most employed algorithm for performing this duty is the Schimidl-Cox, and therefore, any effort concerning to its improvement is worthwhile. In this paper, it is presented a modification to this algorithm ...Show More
Analysis of packet arrival model for 802.11 protocol under hidden terminals and asynchronous MPR detection
Laura Medina-Marin;R. Parra-Michel;Aldo G. Orozco-Lugo;Mauricio Lara
2018 IEEE 9th Latin American Symposium on Circuits & Systems (LASCAS)
Year: 2018 | Conference Paper |
The hidden terminal (HT) problem occurs in a wireless network when there are stations (STAs) that are not able to hear each other, therefore they sense the channel as inactive and try both to transmit simultaneously to an access point (AP) that is visible to both, causing a collision. In this case, the throughput of the network is greatly affected. Traditionally, the 802.11 distributed coordinatio...Show More
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
A Channel Model and Simulation Technique for Reproducing Channel Realizations With Predefined Stationary or Non-Stationary PSD
Ramón Parra-Michel;Javier Vázquez Castillo;Luis René Vela-Garcia;Valeri Kontorovich;Fernando Peña-Campos
Recent communications standards, such as vehicle-to-vehicle and fifth generation, include applications where the transmitted signal encounters rapid changes of propagation scenarios, resulting in wireless links characterized as non-stationary (NS) channels. Hence, channel models that correctly explain and represent the measured time-varying channel statistics, and their associated simulation metho...Show More
Incoherent DPSK Diversity Reception in Doubly Selective Channels Based on Virtual Trajectories
Estimation of channel state information in doubly selective channels (DSC) is a demanding task. In addition, the bandwidth expended in pilot signals may considerably impact the system throughput. Furthermore, the computational resources required for estimation and equalization of the DSC may limit the implementation of practical communication systems. In this correspondence paper, a differential s...Show More
Software Defined Networks-on-Chip for multi/many-core systems: A performance evaluation
R. Sandoval-Arechiga;R. Parra-Michel;J. L. Vazquez-Avila;J. Flores-Troncoso;S. Ibarra-Delgado
2016 ACM/IEEE Symposium on Architectures for Networking and Communications Systems (ANCS)
Year: 2016 | Conference Paper |
Cited by: Papers (9)
By means of a management framework and programmable routing tables, Software Defined Network (SDN) architectures offer network's adaptability to today's computer systems. In Networks-on-Chip (NoC) based systems, management methods have been implemented as specific solutions unable to be reused in further designs. A Software Defined NoC (SDNoC) architecture will permit on-the-fly re/configuration a...Show More
NI + router microarchitecture for NoC-based communication systems
R. Sandoval-Arechiga;R. Parra-Michel;J. L. Vazquez-Avila;B. I. Gea-Garcia
2016 ACM/IEEE Symposium on Architectures for Networking and Communications Systems (ANCS)
Year: 2016 | Conference Paper |
Modern communication systems are characterized by intensive computation signal processing algorithms. System-on-Chip implementations of these systems are generally based on Networks-on-Chip (NoC). The router and Network Interface (NI) are the main elements of the NoC, but the router is the architecture most discussed in the literature. Here, a NI + router microarchitecture is presented. Our router...Show More
The packet arrival model and separation algorithm for an MPR-aware 802.11 DCF MAC protocol
Laura Medina-Marín;Aldo G. Orozco-Lugo;Mauricio Lara;Fernando Téllez-A.;Ramón Parra-Michel
2016 IEEE MTT-S Latin America Microwave Conference (LAMC)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
In the collision channel model (CCM), when a collision occurs, all packets that collide are discarded and the problem is solved by MAC layer protocols. As a result of the development of new signal processing techniques in the physical (PHY) layer, receivers having the capability to resolve multiple collided packets could be designed, enabling what is called multi-packet reception (MPR). In this pa...Show More
A novel harmonic decomposition technique based on a windowing scheme for simulating Rayleigh fading channels
M.I. Baena-Amador;L. Vela-Garcia;R. Parra-Michel;J. Vazquez Castillo
2016 IEEE International Symposium on Antennas and Propagation (APSURSI)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
In this paper a new parameter computation method (PCM) for generating wide sense stationary colored processes for Rayleigh fading channels, is presented. The proposed PCM based on harmonic decomposition technique allows the simulation of stochastic channels with arbitrary Doppler power spectral density. The simulation model generates correlated noise samples with accuracy and improves the converge...Show More
A Low Complexity Multi-Carrier System Over Doubly Selective Channels Using Virtual-Trajectories Receiver
Current communication standards are designed to operate under either frequency or time selectivity. However, the rising demand of higher data rates combined with the mobility of the transceivers has led to the necessity of transmitting under doubly selective channels. In these channels, both single-carrier and multi-carrier approaches find high interference conditions, where the performance in ter...Show More
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