CHAPTER 13

DOA GEO-LOCATION IN A REAL-TIME INDOOR WIFI SYSTEM UTILIZING SMART ANTENNAS

CHIN-HENG LIM

Temasek Laboratories, Nanyang Technological University, Singapore

BOON POH NG, MENG HWA ER, JONI POLILI LIE, and WENJIANG WANG

School of Electrical and Electronic Engineering, Nanyang Technical University, Singapore

13.01 Introduction

Indoor localization technologies have received considerable attention in recent years, and they are applicable in many fields. Applications include locating essential equipment in hospitals and specific items in warehouses by using radio-frequency identification (RFID) tags, tracking people with special needs, who are away from visual supervision, and navigating firefighters inside buildings. As with outdoor systems, they both suffer degradation in performance when multipath errors are present. Over the last couple of years, there has been growing interest in using Wireless Fidelity (WiFi) technology for localization within the RFID industry. As expected, this new RFID technology has also generated numerous commercial, military, and public safety applications in real-time location systems to monitor the position of assets and personnel [1-3]. WiFi, which is also known as 802.11 b/g, has become the preferred technology for wireless local area networking in both business and home environments [4-7]. Indoor localization technology finds important applications in commercial, public safety, and military applications. There is an increasing interest in ...

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