Indoor Communication, 802.11g with IRT

The network planning of a local area network in an indoor scenario is investigated. The model is a multi-story building. The intelligent ray tracing model (IRT) method is used.

Sites and Antennas

There are five antenna sites at different locations in the building for best coverage. The omnidirectional antennas are installed at a height of 2.5 m. Three different carrier frequencies around 2.4 GHz are used.

Air Interface

The wireless local area network (WLAN) air interface is defined by an 802.11b wireless standard (.wst) file. CDMA/WCDMA/HSPA (code division multiple access) was chosen for multiple access. In this model, time division duplex (TDD) is used for duplex separation, which is switching between uplink and downlink.
Tip: Click Project > Edit Project Parameter and click the Air Interface tab to view the carriers and transmission modes.

Computation Method

The computation method 3D Ray Tracing (IRT- with preprocessed data) is selected.
Tip: Click Project > Edit Project Parameter and click the Computation tab to change the model.
The computational method used for this model is the intelligent ray tracing model (IRT) model. It requires a preprocessed geometry database in which all visibility relations have already been determined. As a result, the ray tracing computation time is reduced.


Propagation results show, at every location, the power received from each transmitting antenna individually.

The type of network simulation used is a static simulation (homogeneous traffic per cell). The network simulation calculates results like cell area, site area, best server, maximum data rate. From network results, a single data rate of 11 Mbit/s can be seen over the total area available.

The network simulation calculates the minimum required transmitter power, maximum achievable received signal strength, maximum achievable Eb/N0 and maximum achievable Ec/(N0+I0) for all modulation and coding schemes used in this model for both downlink and uplink.

Figure 1 shows one of the network-planning results: the maximum Eb/N0 for uplink in DBPSK.
Figure 1. Network planning results for the maximum Eb/N0 for uplink DBPSK.