Inter-carrier Interference Analysis and Mitigationfor OFDM System over Fast Fading Channels
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Graphical Abstract
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Abstract
Inter-carrier interference (ICI) due to
Doppler spread is analyzed for OFDM system in highly
mobile applications, and then an iterative ICI mitigation
method is developed. With the Jakes' model for the
Doppler power spectrum and linear model in one OFDM
symbol interval for time-varying channel, the analytical
closed-form expression of Signal-to-interference ratio (SIR)
and Signal-to-interference-plus-noise ratio (SINR) are de-
veloped with neither assumption on the statistical charac-
teristic of ICI nor constraint on the statistical model for
the fading channels. Then, a joint detection algorithm is
proposed to iteratively mitigate ICI and estimate channel
and detect symbols, where the ICI from a few neighbor-
ing interfering subcarriers which contribute the majority
of ICI power is regenerates and partially subtracted from
the received signal in order to mitigate decision error accu-
mulation. The number of concerned interfering subcarriers
and the optimal partial ICI cancellation factor are inves-
tigated for the tradeo® of complexity reduction and Mean
square error (MSE) minimization. Simulation results ver-
ify the proposed method can mitigate ICI e®ectively.
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