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http://dx.doi.org/10.5302/J.ICROS.2006.12.10.989

A Comparison of the Multipath Error Property In Wireless Location of CDMA and OFDM  

Bang Hye-Jung (서울대학교 전기 컴퓨터공학부)
Lee Jang-Gyu (서울대학교 전기 컴퓨터공학부)
Jee Gyu-In (건국대학교 전자공학부)
Kim Jin-Won (삼성전자)
Jung Hee (삼성전자)
Hyun Moon-Pil (삼성전자)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.12, no.10, 2006 , pp. 989-995 More about this Journal
Abstract
This paper shows that the OFDM(Orthogonal Frequency Division Multiplex) system is robust to multipath than CDMA (Code Division Multiple Access) system and it has a strong possibility to be utilized as a supplementing wireless location system for the forthcoming portable internet network. The OFDM system based on IEEE 802.16e is a wireless TDD (Time Division Duplex) OFDMA (Orthogonal Frequency Division Multiple Access) system providing portable internet services in 2.3 GHz frequency band and is scheduled in service in Korea starting in 2006. In this paper, multipath error is calculated using a two-ray model and compared with that of a CDMA system which is following IS-95. The OFDM system shows a maximum multipath error of 3 m while a CDMA system shows a maximum multipath error of 61 m. For this simulation, an early-late technique is used. This technique is usually used to match synchronization of signal in DLL(Delay Lock Loop).
Keywords
wireless location; OFDM; CDMA; multipath;
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