An Improved Symbol Offset Estimation Technique in OFDM-based Wireless LANs 


Vol. 27,  No. 1, pp. 66-78, Jan.  2002


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  Abstract

In this paper, we propose a new symbol offset estimation technique for an orthogonal frequency-division multiplexing (OFDM)-based wireless LAN. When both inter-symbol interference (lSI) and inter-channel interference (lCI) do not exist in an OFDM symbol, symbol offsets cause circular shifts in the estimated channel impulse response (CIR) by the amount of symbol offset. Also, the power delay protile of a typical multipath wireless channel can be modeled by exponentially decaying function, and most energy of multipath channel is concentrated at the beginning part of the CIR. Based on these properties, the proposed symbol offset estimation technique estimates the CIR, which is circularly shifted by the amount of symbol offset, and then calculates the partial mean power from the estimated impulse response by using a moving window with a tinite length. And, symbol offset can be estimated from the index of a moving window having the maximal partial mean power. The proposed technique can reduce noise effect in the process of the CIR estimation, and remove ISI and ICI using repetitive training symbol stmcture in time-domain for minimum training overhead. The performaces of the proposed symbol offset estimation technique in typical indoor channels are demonstrated by computer simulation.

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  Cite this article

[IEEE Style]

W. Jeon and Y. Cho, "An Improved Symbol Offset Estimation Technique in OFDM-based Wireless LANs," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 1, pp. 66-78, 2002. DOI: .

[ACM Style]

Won-gi Jeon and Yong-soo Cho. 2002. An Improved Symbol Offset Estimation Technique in OFDM-based Wireless LANs. The Journal of Korean Institute of Communications and Information Sciences, 27, 1, (2002), 66-78. DOI: .

[KICS Style]

Won-gi Jeon and Yong-soo Cho, "An Improved Symbol Offset Estimation Technique in OFDM-based Wireless LANs," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 1, pp. 66-78, 1. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880