WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
EURASIP Journal on Wireless Communications and Networking - 3GPP LTE and LTE Advanced
Windowed DFT-based OFDM channel estimation by adding virtual channel frequency response
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Analysis of pilot-aided channel estimation with optimal leakage suppression for OFDM systems
IEEE Communications Letters
New OFDM channel estimation with dual-ICI cancellation in highly mobile channel
IEEE Transactions on Wireless Communications
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Equidistance in pilot spacing is an essential condition for discrete Fourier transform (DFT)-based channel estimation in OFDM systems. However, virtual subcarriers break this condition, degrade the estimation performance, and cause the interference (called ''leakage') because the orthogonality of Fourier matrix is broken. To solve this problem, we first analyze the leakage using the DFT-inverse DFT process. The pilot subcarriers inside virtual subcarriers area are estimated by the inverse of the estimated leakage. Thus, the equidistance condition is satisfied. The proposed estimator operates well in realistic environment such as IEEE 802.16, and it is robust to an increase of virtual subcarriers.