Paper Info
Title
Estimation and Mitigation of Intercarrier Interference for OFDM Systems in Multipath Fading Channels
Abstract
Orthogonal Frequency Division Multiplexing (OFDM) is a transmission technique which is robust in multipath channels. It is though sensitive to frequency errors that may be caused by several factors such as frequency offset at the local oscillator, phase noise and mobility of the receiver. These errors may destroy orthogonality among subcarriers and introduce InterCarrier Interference (ICI) that may be represented in the frequency domain by means of an ICI matrix. Estimation of this matrix is crucial to optimize performance. In this work we propose two iterative methods that use pilot tones in the frequency domain and converge very quickly. The first proposed method works in two steps. Initially, correlation between received signal and estimated transmitted one is used to recover the channel matrix, and then it estimates the actual transmitted data by means of MMSE. This method is shown to be very effective in AWGN channel with frequency offset at the local oscillator or in one time variant path channel. The second method represents an extension to more severe channel conditions such as multipath fading. In this case a different frequency domain OFDM channel representation is needed and a suitable scheme is implemented to recover channel and data. Simulation results show that the proposed algorithms look promising to be used in actual implementations.
Year
DOI
Venue
2008
10.1109/WiMob.2008.58
Avignon
Keywords
Field
DocType
multipath channel,channel representation,frequency error,channel matrix,frequency domain,local oscillator,multipath fading channels,time variant path channel,intercarrier interference,different frequency domain ofdm,awgn channel,severe channel condition,ofdm systems,orthogonal frequency division multiplexing,fading,frequency domain analysis,ofdm,frequency offset,estimation,phase noise,time frequency analysis,multipath fading,iteration method,ofdm modulation,bit error rate,iterative methods
Frequency domain,Multipath propagation,Telecommunications,Computer science,Fading,Frequency offset,Phase noise,Algorithm,Orthogonal frequency-division multiplexing,Local oscillator,Bit error rate,Distributed computing
Conference
ISSN
ISBN
Citations 
2160-4886
978-0-7695-3393-3
2
PageRank 
References 
Authors
0.47
10
3
Name
Order
Citations
PageRank
Lorenzo Favalli16814.67
Pietro Savazzi28316.09
Anna Vizziello3408.92