Computational Analysis of Indoor-to-Outdoor Propagation Characteristics in Office Environment at 2.4 GHz and 5.2 GHz Bands

摘要

In this paper we predict indoor-to-outdoor radio wave propagation characteristics for a wireless LAN access point set up in an office building. We present the relationship between the office environments and the propagation characteristics by using the four kinds of numerical models of a single floor in the office building and discuss differences between propagation characteristics at the two frequencies of 2442 MHz and 5200 MHz. We set the outdoor observation plane at the surface of an exterior wall including windows and calculate received signal strength indication (RSSI) distributions, path loss and shadow fading there. It is clarified that the path loss at 5200 MHz is smaller than that at 2442 MHz, and that the path loss increases by being obstacles inside. In addition, the RSSI distributions in the observation plane shows that the transmission power through the window region is larger than that through the concrete region, which is clearer as the frequency is higher. Therefore, we conclude that the shadow fading is obtained by superimposing the components passing through the window region and the concrete region.