BEING A PROJECT REPORT SUBMITTED TO THE DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING, COLLEGE OF ENGINEERING AND TECHNOLOGY, FEDERAL UNIVERSITY OF PETROLEUM RESOURCES EFFURUN, DELTA STATE.

ABSTRACT This project addresses the persistent challenge of poor cellular network connectivity in areas with weak or inconsistent signal coverage, particularly in remote regions, densely built urban areas, and heavily shielded buildings where users experience degraded connections due to distance from cellular towers, environmental obstructions, and interference. The project aimed to design and develop a 4G signal booster with multi-band capability, adaptive gain control, and efficient power management for domestic use. The system utilizes an Arduino Uno microcontroller as the central controller, a 3-stage amplifier board for signal boosting, outdoor and indoor antennas for capturing, amplifying, and retransmitting weak signals, a 16x4 LCD display for real-time monitoring, and a regulated power supply unit with transformer, bridge rectifier, and voltage regulator components. The system was implemented through both software programming using Arduino IDE and hardware construction involving circuit design, component integration, and extensive testing procedures. Results demonstrated significant signal strength improvements across all major Nigerian network operators (MTN, Globacom, Airtel, and 9Mobile), with signal levels improving from weak ranges of -68 to -90 dBm to strong ranges of -20 to -30 dBm, providing up to 32x signal amplification and coverage area of 30,000 sq. ft. The successful implementation of this cost-effective solution (₦308,000) proves the feasibility of Arduino-based signal boosters for enhancing GSM connectivity in challenging environments, offering real-time monitoring capabilities and automatic adaptation to varying signal conditions.