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Summary: IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 47, NO. 3, MARCH 1999 365
Analysis of New and Existing Methods of Reducing Intercarrier
Interference Due to Carrier Frequency Offset in OFDM
Jean Armstrong
Abstract--Orthogonal frequency division multiplexing (OFDM)
is very sensitive to frequency errors caused by frequency differ-
ences between transmitter and receiver local oscillators. In this
paper, this sensitivity is analyzed in terms of the complex weight-
ing coefficients which give the contribution of each transmitter
subcarrier to each demodulated subcarrier. Previously described
windowing and self-intercarrier interference (ICI) cancellation
methods are analyzed in terms of these weighting coefficients.
New ICI cancellation schemes with very much improved perfor-
mance are described. A condition for orthogonality of windowing
schemes is derived in terms of the discrete Fourier transform
(DFT) of the windowing function.
Index Terms-- Discrete Fourier transform, intercarrier inter-
ference, interference suppression, orthogonal frequency division
multiplexing, synchronization.
I. INTRODUCTION
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