Downlink performance evaluation of multi-mode devices in WiMAX and WiFi environment

The attention on WiMAX and WiFi technologies are rapidly progressing and now it is common to find them not just in laptops and personal digital assistants (PDAs), but in equipment as mobile phones, parking meters, security cameras and home entertainment equipment. A combination of WiFi and WiMAX deployment, will offer more cost-effective solution than a sole WiMAX or WiFi implementation. Its technology is best meets the demand for personal broadband services. This project is focused on the performance evaluation of WiMAX and WiFi systems. It is conducted using open source simulator called NCTUns 6.0. Several scenarios have been created, to evaluate the coexistence of WiMAX and WiFi technology. The data of the simulation results have been gathered and the performance with the effects of transport layer protocol, send rates, packet sizes, distances, bandwidth and queue length were analyzed. Based on the results obtained, the performance of both WiMAX and WiFi technology are not affected due to distances variation but its performance can be improved by using of other parameter such as packet size, bandwidth and queue length.