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Conference Paper
An Efficient Channel Tracker Using Pilots in OFDM Systems
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- Authors
- Choong Il Yeh, Dong Seung Kwon, Whan Woo Kim
- Issue Date
- 2003-09
- Citation
- International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC) 2003, pp.241-244
- Language
- English
- Type
- Conference Paper
- Abstract
- This paper proposes an algorithm to combat the performance degradation of an IEEE802.11a orthogonal frequency division multiplexing (OFDM) system under the time-varying channel conditions by supplementing the conventional channel estimation method that uses a preamble. Packets in wireless local area network (WLAN) systems consist of preamble symbols for channel estimation and data symbols for traffic transmission. There are some pilots inserted within each data symbol to correct the phase error due to the frequency offset remaining even after the automatic frequency control (AFC) The proposed algorithm utilizes the pilots and requires a small amount of additional hardware. The validity of the proposed algorithm is verified by computer simulation. © 2003 IEEE.