ICI Mitigation for Pilot-Aided OFDM Mobile Systems Yasamin Mostofi, Member, IEEE and Donald C. Cox, Fellow, IEEE IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 4, NO.2, MARCH 2005. 老師：高永安 學生：蔡育修. Outline. Introduction System model Piece-Wise Linear Approximation Method I
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reasons---1.near-constant channel in each frequency subband. 2.prevent ISI.
using them for data detection results in poor perfor-mance.
mation is a good estimate of channel time-variations.
We will derive the frequency domain relationship.
Therefore, we approximate
we will have
or both adjacent symbols.
T+(N/2)*Ts for the former and T for the latter.
delay and Doppler spread at the price of higher compu-
to the average interference power.
compare it to the that of the “no mitigation” case.
Let MAV represent the tap with maximum absolute value.
All the estimated taps with absolute values smaller than
MAV/γ for some γ>=1 will be zeros.Noise/Interference Reduction
that are separated by 20μs.
ters with total delay of 36.5μs.
in the absence of
noise for both channels.
received SNR for achieving a Pb = 0.2.
estimate channel time-variations in each OFDM symbol.
received SNR to a value close to that of the case with no