C5. Time difference of arrival by IEEE 802.11a, g based on practical estimation

Localization and tracking have recently gained a special importance. A common system for positioning in outdoor environment as e.g. the Global Positioning System (GPS) exists already. GPS is useless for indoor positioning because its signals are weakened or even blocked. This motivated the use of another wireless system to accomplish positioning. Wireless Local Area Network (WLAN) Access Points (APs) are already installed inside buildings, making them a suitable replacement for GPS. Many techniques exist for extracting and calculating location information form the WLAN signals. Among them are super resolution algorithms such as Root Multiple Signal Classification (Root-MUSIC), Estimation of Signal Parameters via Rotational Invariance Technique (ESPRIT), and Matrix Pencil (MP). Many researchers applied these techniques on a specially designed WLAN signals. To apply these techniques in real applications, they should be tested on true wireless signals. In this paper, the performance of super resolution techniques is practically tested on a WLAN transceiver using the communication signals without any modifications.