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All Journal International Journal of Informatics, Information System and Computer Engineering (INJIISCOM)
Aniru, Muhammed Abudu
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Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Testing and Analysis of PIM Performance in a Passive DAS Network - Experimental Approach Aniru, Muhammed Abudu; Omoavowere, Emagbetere Joy
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol. 6 No. 1 (2025): INJIISCOM: VOLUME 6, ISSUE 1, JUNE 2025
Publisher : Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/injiiscom.v6i1.12700

Abstract

Passive intermodulation (PIM) poses a significant challenge in telecommunication networks, with potentially severe impacts on network performance and signal integrity if not addressed during the initial deployment phase. This study investigates PIM levels within a passive distributed antenna system (DAS) network for cellular mobile radio communication across multiple floors of a building. The network comprises coaxial cables, connectors, splitters, combiners, and antennas structured in a systematic plan. This work used the experimental method to test for PIM in the network used for this investigation. Designed as a multicarrier system, it handles RF signals across frequencies of 700/850MHz, 1900MHz, 2100MHz, and 2600MHz. On-site PIM testing was conducted during the network deployment phase to analyze the behavior of high-power RF signals. Utilizing Kaelus iQA-1921C and iQA 850C series PIM analyzers, tests were conducted following known industry codes and standards. High RF power was preset to 43dBm for full band, 35dBm for high bands, and 25dBm for low band. The test equipment was calibrated on high PIM load and low PIM load. Test points were selected at both vertical and horizontal subsystem cabling structures, focusing on riser cables. The standard baseline performance PIM levels was set to -150dBc. The analysis focused on examining the characteristics of PIM signals captured via time-domain PIM traces, investigating the impact of altering the frequency of the two-tone signal on the IM3 frequency component, and highlighting the importance of selecting an appropriate frequency for the two-tone signal that is not positioned near the edges. Results were based on pass or fail test, and resolution measures were taken to mitigate interference.
Design and construction of a smart lock system using Internet of Things (IoT) Aniru, Muhammed Abudu; Osasenaga, Enoma Victor; Emmanuel, Osamwonyi Efosa; Gerald, Matthew Onyeka; Melody, Emede Oghenekome
International Journal of Informatics, Information System and Computer Engineering (INJIISCOM) Vol. 6 No. 1 (2025): INJIISCOM: VOLUME 6, ISSUE 1, JUNE 2025
Publisher : Universitas Komputer Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/injiiscom.v6i1.14127

Abstract

This paper aims to design and construct a smart door lock system using the Internet of Things (IoT), WiFi module, relay module and other peripheral devices to provide people with an incomparable level of control and accessibility over their home’s entry points. Traditional door lock systems are slow, insecure and with high vulnerability and they require human intervention to lock and unlock them. Thus, an IoT-based smart door lock system offers a proper lock protection mechanism with better performance. The system comprises a microcontroller (NodeMCU ESP8266), solenoid lock, DC battery(12V), 5V 3A buck converter (LM7805), WiFi module and a switching device (Relays). The setup of the system was tested with 3 independent devices for 10 trials. All of the trials accurately interpreted the received commands and transmitted the corresponding signals to the interfaced relay module. Subsequently, the relay module effectuated the lock/unlock operation on the integrated solenoid lock mechanism, thus accomplishing the intended objective of the study.
Co-Authors Emmanuel, Osamwonyi Efosa Gerald, Matthew Onyeka Melody, Emede Oghenekome Omoavowere, Emagbetere Joy Osasenaga, Enoma Victor