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Analysis of DFT-based Channel Estimation in OFDM System with Virtual Subcarriers  

Kwak, Kyung-Chul (연세대학교 전기전자공학과 정보통신연구실)
Hong, Dae-Sik (연세대학교 전기전자공학과 정보통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.10A, 2008 , pp. 941-948 More about this Journal
Abstract
In this paper, the effect of unobtainable channel frequency response (CFR) inside virtual subcarreiers on DFT-based channel estimation is derived and introduced numerically because the CFRs cause the leakage to the estimated channel and degrade the estimation performance. In addition, the performance of DFT-based channel estimation is analyzed with respect to the number of virtual subcarriers, pilot spacing and the number of unobtainable CFRs at equi-distance subcarriers inside virtual subcarriers.
Keywords
OFDM; Channel estimation; Virtual subcarrier;
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