Paper Info
Title
On the Cramer-Rao Lower Bound for Frequency Correlation Matrices of Doubly Selective Fading Channels for OFDM Systems
Abstract
In this paper, the Cramer-Rao lower bound (CRLB) of the sample frequency correlation matrices (SFCM) is derived based on a rigorous model of the doubly selective fading channel for orthogonal frequency division multiplexing (OFDM) systems with pilot-symbol-aided modulation. By assuming a fixed pil ot sequence and independent samples, SFCM is complex Wishart distributed. Then, the maximum likelihood estimator (MLE) and the exact expression of CRLB are obtained. From CRLB, the lower bounds of total mean squared error (TMSE) and average mean squared error (AvgMSE) independent of the pilot sequence are deduced, which reveal that the amount of samples is the dominant factor affecting AvgMSE while the signal-to-noise ratio and the maximum Doppler spread have negligible effect. Numerical simulations demonstrate the analytic results. Index Terms—CRLB, Frequency correlation matrix, Doubly selective fading channels, OFDM.
Year
Venue
Keywords
2008
Clinical Orthopaedics and Related Research
sampling frequency,mean square error,signal to noise ratio,information theory,indexing terms,cramer rao lower bound,numerical simulation,correlation matrix,fading channel,computer science,lower bound,wishart distribution,maximum likelihood estimate
DocType
Volume
Citations 
Journal
abs/0811.0
1
PageRank 
References 
Authors
0.38
12
4
Name
Order
Citations
PageRank
Xiaochuan Zhao126317.98
Ming Yang2101.73
Tao Peng339146.51
Wenbo Wang410.38