ALFREDO GARDEL-VICENTE | Universidad de Alcala (original) (raw)

Address: Villanueva de la Torre, Castille-La Mancha, Spain

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Papers by ALFREDO GARDEL-VICENTE

Research paper thumbnail of Characterization of Multipath Effects in Indoor Positioning Systems by AoA and PoA Based on Optical Signals

Sensors, 2019

In this paper, we characterize and measure the effects of the errors introduced by the multipath ... more In this paper, we characterize and measure the effects of the errors introduced by the multipath when obtaining the position of an agent by means of Indoor Positioning Systems (IPS) based on optical signal. These effects are characterized in Local Positioning Systems (LPSs) based on two different techniques: the first one by determining the Angle of Arrival (AoA) of the infrared signal (IR) to the detector; and the second one by working with the measurement of the Phase shift of signal Arrival from the transmitter to a receiver (PoA). We present the obtained results and conclusions, which indicate that using Position Sensitive Devices (PSD) the multipath effects for AoA have little impact on the measurement, while for PoA the positioning errors are very significant, making the system useless in many cases.

Research paper thumbnail of Analysis of Multiple-Access Discrimination Techniques for the Development of a PSD-Based VLP System

Sensors, 2020

There are several technologies and techniques available when developing indoor positioning system... more There are several technologies and techniques available when developing indoor positioning systems (IPS). Recently, the development of positioning systems based on optical signals has aroused great interest, mainly those using visible light from the lighting infrastructure. In this work, we analyze which techniques give better results to lay the foundations for the development of a Visible Light Positioning system (VLP). Working only with a receiver, it is analyzed what the result of determining the position of different emitters is when they emit simultaneously and without any synchronism. The results obtained by Frequency Division Multiple Access (FDMA) (with digital bandpass filters, I/Q demodulation, and FFT) and Code Division Multiple Access (CDMA) are compared. The interference between signals when emitted simultaneously from multiple emitters is analyzed as well as the errors they cause and how these effects can be mitigated. As a result of the research, the advantages and di...

Research paper thumbnail of Indoor Positioning System Based on a PSD Detector, Precise Positioning of Agents in Motion Using AoA Techniques

Research paper thumbnail of Calibration of a zoom lens camera with pan-tilt movement for robotics

Research paper thumbnail of FPGA and SoC Devices Applied to New Trends in Image/Video and Signal Processing Fields

Research paper thumbnail of Embedded Vision Modules for Tracking and Counting People

IEEE Transactions on Instrumentation and Measurement, 2009

Research paper thumbnail of Remote Automation Laboratory Using a Cluster of Virtual Machines

IEEE Transactions on Industrial Electronics, 2010

Research paper thumbnail of Calibration of a High-Accuracy 3-D Coordinate Measurement Sensor Based on Laser Beam and CMOS Camera

IEEE Transactions on Instrumentation and Measurement, 2009

Research paper thumbnail of Characterization of Multipath Effects in Indoor Positioning Systems by AoA and PoA Based on Optical Signals

Sensors, 2019

In this paper, we characterize and measure the effects of the errors introduced by the multipath ... more In this paper, we characterize and measure the effects of the errors introduced by the multipath when obtaining the position of an agent by means of Indoor Positioning Systems (IPS) based on optical signal. These effects are characterized in Local Positioning Systems (LPSs) based on two different techniques: the first one by determining the Angle of Arrival (AoA) of the infrared signal (IR) to the detector; and the second one by working with the measurement of the Phase shift of signal Arrival from the transmitter to a receiver (PoA). We present the obtained results and conclusions, which indicate that using Position Sensitive Devices (PSD) the multipath effects for AoA have little impact on the measurement, while for PoA the positioning errors are very significant, making the system useless in many cases.

Research paper thumbnail of Analysis of Multiple-Access Discrimination Techniques for the Development of a PSD-Based VLP System

Sensors, 2020

There are several technologies and techniques available when developing indoor positioning system... more There are several technologies and techniques available when developing indoor positioning systems (IPS). Recently, the development of positioning systems based on optical signals has aroused great interest, mainly those using visible light from the lighting infrastructure. In this work, we analyze which techniques give better results to lay the foundations for the development of a Visible Light Positioning system (VLP). Working only with a receiver, it is analyzed what the result of determining the position of different emitters is when they emit simultaneously and without any synchronism. The results obtained by Frequency Division Multiple Access (FDMA) (with digital bandpass filters, I/Q demodulation, and FFT) and Code Division Multiple Access (CDMA) are compared. The interference between signals when emitted simultaneously from multiple emitters is analyzed as well as the errors they cause and how these effects can be mitigated. As a result of the research, the advantages and di...

Research paper thumbnail of Indoor Positioning System Based on a PSD Detector, Precise Positioning of Agents in Motion Using AoA Techniques

Research paper thumbnail of Calibration of a zoom lens camera with pan-tilt movement for robotics

Research paper thumbnail of FPGA and SoC Devices Applied to New Trends in Image/Video and Signal Processing Fields

Research paper thumbnail of Embedded Vision Modules for Tracking and Counting People

IEEE Transactions on Instrumentation and Measurement, 2009

Research paper thumbnail of Remote Automation Laboratory Using a Cluster of Virtual Machines

IEEE Transactions on Industrial Electronics, 2010

Research paper thumbnail of Calibration of a High-Accuracy 3-D Coordinate Measurement Sensor Based on Laser Beam and CMOS Camera

IEEE Transactions on Instrumentation and Measurement, 2009

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