Testing and Analysis of PIM Performance in a Passive DAS Network - Experimental Approach

Muhammed Abudu Aniru (Department of Electrical/Electronic Engineering, University of Benin, Benin City, Nigeria)
Emagbetere Joy Omoavowere (Department of Electrical/Electronic Engineering, University of Benin, Benin City, Nigeria)

International Journal of Informatics, Information System and Computer Engineering (INJIISCOM)
Vol. 6 No. 1 (2025): INJIISCOM: VOLUME 6, ISSUE 1, JUNE 2025

This study investigates Passive Intermodulation (PIM) levels within a passive distributed antenna system (DAS) for cellular networks across a multi-floor building. PIM significantly degrades network performance if unaddressed during deployment. Using an experimental approach, on-site testing was conducted on a multicarrier system (700–2600MHz) using Kaelus PIM analyzers. Tests strictly followed industry standards with high RF power configurations. Test points included vertical and horizontal cabling against a -150dBc baseline. Analysis focused on time-domain PIM traces and the impact of altering two-tone signal frequencies on the IM3 component. The findings emphasize selecting frequencies away from band edges to avoid interference. Resolution measures based on pass/fail outcomes effectively mitigated PIM, ensuring optimal signal integrity and network reliability