Paper Info
Title
Frequency smoothing gains in preamble-based channel estimation for multicarrier systems.
Abstract
In this paper, the problem of least-squares (LS) preamble-based channel estimation in multicarrier systems under a deterministic channel assumption is revisited. The analysis is presented for the filterbank multicarrier offset quadrature amplitude modulation (FBMC/OQAM) system, although the derived results hold unchanged for the cyclic prefixed orthogonal frequency division multiplexing (CP-OFDM) system, as well. Assuming independent noise disturbances per subcarrier, we show that frequency-domain smoothing techniques can be used to improve the mean square error (MSE) performance. Depending on the number of subcarriers, the choice of smoothing may be different. We also present the time-domain formulation of the frequency-domain smoothing. Based on this formulation, we show that frequency-domain smoothing techniques can minimize the variance of the LS channel estimator, while they can further reduce its MSE by trading bias for variance. Simulations are given to support the derived results.
Year
DOI
Venue
2013
10.1016/j.sigpro.2013.01.010
Signal Processing
Keywords
Field
DocType
Least squares (LS),Filterbank multicarrier (FBMC),Offset quadrature amplitude modulation (OQAM),Preamble,Smoothing
Subcarrier,Signal processing,Control theory,Filter bank,Communication channel,Mean squared error,Smoothing,Orthogonal frequency-division multiplexing,Mathematics,Estimator
Journal
Volume
Issue
ISSN
93
9
0165-1684
Citations 
PageRank 
References 
0
0.34
2
Authors
4
Name
Order
Citations
PageRank
Dimitrios Katselis111212.34
Cristian R. Rojas225243.97
Mats Bengtsson31493110.70
Håkan Hjalmarsson41254175.16