Paper Info
Title
An Efficient Near Blind Carrier Frequency Offset Estimation Scheme for MIMO-OFDM Systems
Abstract
A novel technique for the estimation of carrier frequency offset (CFO) in orthogonal frequency division multiplexing (OFDM) based multiple input multiple output (MIMO) communication systems is proposed in this paper. While the conventional null subcarrier based methods estimate the CFO through a single global line search, the proposed method employs a two step procedure. Firstly the integer frequency offset is estimated by means of a cost function minimization over the trial integer offset values. Then the fractional frequency offset is estimated through a fine search over one subcarrier spacing on either side centered on zero offset reference after correcting the integer offset. We also propose a novel null subcarrier allocation scheme based on Fibonacci series, which ensures a CFO estimation range equal to the OFDM bandwidth. Furthermore, performance of the proposed frequency offset estimator is mathematically analyzed by deriving the Cramer-Rao lower bound and compared it with the mean square estimation error to demonstrate its efficiency. Our algorithm is shown to outperform a popular method reported in literature in terms of BER performance and estimation complexity.
Year
DOI
Venue
2008
10.1109/GLOCOM.2008.ECP.627
IEEE Global Telecommunications Conference (Globecom)
Keywords
Field
DocType
Multiple input multiple output (MIMO),Orthogonal frequency-division multiplexing (OFDM),Carrier frequency offset (CFO),Null subcarriers,Cramer-Rao lower bound
Subcarrier,MIMO-OFDM,Control theory,Computer science,Frequency offset,Carrier frequency offset,MIMO,Algorithm,Real-time computing,Orthogonal frequency-division multiplexing,Offset (computer science),Estimator
Conference
ISSN
Citations 
PageRank 
1930-529X
0
0.34
References 
Authors
8
2
Name
Order
Citations
PageRank
S. M. Sameer1122.74
Ratnam V. Raja Kumar2154.87