Simulation of a wireless PBX system for offices

Presents a software real-time simulation model of an envisaged FDMA wireless PBX system, based on second-generation digital cordless telephones at 900 MHz. The initial results show that such a system is feasible and can support the required user densities in office buildings. The system performance was found to be adequate using between 2-6 transceivers per basesite, and between 9-20 basesites per floor for user densities of between 0.1 and 0.7 CTs per 20 m². It has been shown that an FDMA wireless PBX system will provide considerable installation and maintenance cost savings at higher user densities, when compared with a TDMA-based system. At lower densities the advantages of either approach are less clear, but if the number of basesites is critical in terms of system cost and performance, then again FDMA would appear to be the better approach to adopt. However, there are indications that a hybrid TDMA/FDMA solution would be optimum for future wireless PBX systems