Browsing by Autor "Misael Felix Quispe Maidana"

Now showing 1 - 2 of 2

Comparative Analysis of Fixed-Gain, PID, and Adaptive PID Controllers for AGC in VLC Receivers
(2025) Misael Felix Quispe Maidana; Leonel Mendoza Terrazas; Jhon Quispe Suca
The Visible light communication represents a promising technology for high-speed, secure and low-cost wireless communications. However, the variability of the optical channel, the presence of noise and the positioning of the receiver affect the quality of the signal received through this medium. This article presents a comparative analysis of the performance of an AGC gain block incorporated after the Photodiode and the Trans Impedance Amplifier, for three configurations: the first with fixed gain and without control, the second with classic PID control with fixed gains, and the third with adaptive PID control based on fuzzy logic. The system was implemented in a MATLAB simulation environment, considering a realistic model that includes the optical signal, Gaussian noise, and variable distance between the transmitter and receiver. The diffuse adaptive PID controller improves reference tracking and reduces error compared to conventional methods but increases computational load and processing delays. In contrast, the fixed-gain PID controller is simpler and allows overshoot to enhance transient performance and the $e_{s s}$, which may cause increased physical stress or wear during implementation.
Smart Wearable Glasses for Real-Time Object and Text Recognition to Assist Visually Impaired Users in Bolivia
(2025) Dylan Benjamin Mamani Poma; Misael Felix Quispe Maidana
In Bolivia, more than 120,000 people live with complete blindness and more than 300,000 experience low vision, mostly in underserved regions and moreover with limited access to ophthalmological care. This study presents a developed low-cost prototype of wearable smart glasses with a 3D-printed enclosure, integrating real-time object detection and OCR capabilities. The system is built using off-the-shelf components, including a Raspberry Pi 4 and a digital camera, then for the programming utilizes open-source libraries such as OpenCV, YOLOv4-Tiny, and Tesseract OCR. The device provides auditory feedback in Spanish, English, and basic Aymara, enhancing linguistic accessibility. A mixed-methods evaluation was conducted, combining technical performance metrics and user experience assessments with participants from the Bolivian Institute for the Blind (IBC). Results show high user satisfaction (average rating: 9/10) and a positiveve impact on orientation and autonomy. The solution is inclusive, replicable, and holds potential to improve the quality of life for visually impaired individuals in low-resource settings.