Interpolation Using Wavelet Bases
IEEE Transactions on Pattern Analysis and Machine Intelligence
Robust channel estimation for the OFDM-based WLAN systems with imperfect synchronization
Wireless Personal Communications: An International Journal
Subspace Projection-based OFDM Channel Estimation
Wireless Personal Communications: An International Journal
Insights on ICI and its effects on performance of OFDM systems
Digital Signal Processing
A comparison of pilot-aided channel estimation methods for OFDMsystems
IEEE Transactions on Signal Processing
IEEE Transactions on Consumer Electronics
Transmission techniques for digital terrestrial TV broadcasting
IEEE Communications Magazine
Image data compression using cubic convolution spline interpolation
IEEE Transactions on Image Processing
Locally adaptive wavelet-based image interpolation
IEEE Transactions on Image Processing
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Pilot-aided channel estimation in orthogonal frequency division multiplexing (OFDM) systems often needs an interpolation technique to construct the channel frequency response on nonpilot subcarriers. Many studies on interpolations have been published; however, the performance of interpolations such as cubic spline interpolation and linear interpolation is limited by either the number or the position of the pilot subcarriers. This paper proposes an analytic interpolator developed using a linear least square criterion to replace conventional interpolation techniques for comb-type pilot-added channel estimation in OFDM systems without inter-carrier interference. The performance evaluation of the analytic interpolator is performed both on the basis of theory and through simulation, and the results from both the analyses are found to be in good agreement. The simulation results show that the proposed method can effectively mitigate the ill-influences of limitations on the number and position of the pilot subcarriers and that it also outperforms the cubic spline interpolation and linear interpolation, especially for short or nonequidistant pilot patterns.