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On the Mitigation of Inter-carrier Interference for OFDM Systems
 

Summary: On the Mitigation of Inter-carrier Interference for
OFDM Systems
Tevfik Y¨ucek and H¨useyin Arslan
Department of Electrical Engineering, University of South Florida
4202 E. Fowler Avenue, ENB 118, Tampa, FL, 33620
yucek@eng.usf.edu and arslan@eng.usf.edu
EXTENDED ABSTRACT
Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation scheme that provides efficient
bandwidth utilization and robustness against time dispersive channels. However, OFDM systems are more sensitive
to the frequency offset than single carrier systems and the sensitivity increases with the number of sub-carriers
and with the constellation size. Frequency offset results in the loss of orthogonality among sub-carriers and causes
intercarrier interference (ICI). ICI has Gaussian statistics and affects both channel estimation and detection of the
transmitted symbols. In this poster, we will present methods to mitigate the effects of ICI in the detection of symbols
as well as in the channel estimation.
ICI Reduction using AR Modeling
Most of the ICI reduction methods model ICI as additive white Gaussian noise. Although ICI has the statistics
of Gaussian distribution due to central limit theorem for sufficiently large subcarriers, it is not white. We have
exploited the colored nature of ICI by modeling ICI as an auto-regressive (AR) process and whitening it. Although
the proposed algorithm is intended to reduce the ICI, it will also reduce any kind of interference which is colored.
Adjacent channel interference (ACI) and co-channel interference (CCI) are two examples that are colored in nature

  

Source: Arslan, Hüseyin - Department of Electrical Engineering, University of South Florida

 

Collections: Engineering