Co-existence of wireless communication systems in ISM bands: An analytical study

Abstract

This thesis studies the mutual interference between the Bluetooth and IEEE 802.11b networks, and thus to propose a scheme to enhance the systemsa?? performance by selecting appropriate parameters, such as packet type, packet segmentation size, adaptive data rate, transmit distance and etc., consequently allow the two systems can operate in a shared environment without significantly impacting the performance of each other. Throughout this thesis a number of assumptions are used for modeling the indoor wireless channel, the received signal power and interference. The analysis comprises interference at PHY and MAC layers. At the PHY layer, performance of specific modulations for the Bluetooth receiver and the various IEEE 802.11b data rates is calculated. At the MAC layer, collision probability for the Bluetooth or 802.11b packet overlapped by interfering packets in both time and frequency is thoroughly analyzed. We develop a model for the analysis of PER by means of an integrated approach, which properly takes all transmission aspects (propagation distance, interference, thermal noise, modulations, data rates, packet size) into account. Thus system performance over distance is obtained. By using the proposed evaluation framework, the optimum packet type, segmentation size, safe distance ratio and data rate for the transmitter and receiver at current link condition are easily obtained.