Electromagnetic simulations and numerical models for an accurate prediction of indoor radio wave propagation in an office environment

摘要

A high-power wireless LAN (WLAN) access point (AP) based on IEEE802.11n/ac standard makes it possible to build easily wireless networks including a few floors in the adjacent as well as many rooms in the same floor. This paper discusses indoor propagation characteristics including received signal strength indicators (RSSI) and channel modeling in the premises of Information Initiative Center, Hokkaido University by measurements and a large-scale numerical simulations. A precise numerical model with reinforced-concrete walls, furniture and so on is developed for the numerical simulation at the frequency of 5200 MHz. Comparing the calculated results with the measurements, we confirm the validity of numerical technique for estimating RSSI and channel modeling in the indoor office environment. Moreover, it is clarified from calculations using two kinds of numerical model with the reinforcing rods in the concrete walls and without them that the indoor propagation channels are significantly influenced by the reinforced-concrete walls. The proposed numerical technique and the numerical model indicate their accuracy in predicting the RSSI and indoor channel model for WLAN.