A modified multi-wall wave propagation model for concrete based building structure

摘要

In this work several empirical propagation models have been studied based on many signal strength measurements in an indoor environment (Ophthalmology Specialized Hospital) using log-distance model for LOS (Line of Sight) area and MWM (Multi-Wall Model) for NLOS (Non Line of Sight) areas. The building is typical in Iraq (more than 85% of the buildings have this structure). It has two types of walls, 10cm and 20cm cement block walls. In this work five Multi-Wall Models have been studied and a modified one has been generated based on modifying one of them. Comparison between on site measured signal strength data and software based reading shows the applicability of the model to this building structure. In the study the measured signal strength was for a wireless access point which was working as a transmitter (Tx) and a Laptop WLAN card was working as a receiver (Rx). The Netstumbler software was used to detect the access point signal and measuring the signal strength. The used devices and software are very cost-effective and there was no need for expensive equipment for conducting the whole study which is a positive side for this study