Non-data-aided carrier offset estimators for OFDM with null subcarriers: identifiability, algorithms, and performance

The ability of orthogonal frequency-division multiplexing systems to mitigate frequency-selective channels is impaired by the presence of carrier frequency offsets (CFOs). In this paper, we investigate identifiability issues involving high-resolution techniques that have been proposed for blind CFO...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications Vol. 19; no. 12; pp. 2504 - 2515
Main Authors: Xiaoli Ma, Tepedelenlioglu, C., Giannakis, G.B., Barbarossa, S.
Format: Journal Article
Language:English
Published: New York IEEE 01.12.2001
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Adaptive algorithm
Adaptive algorithms
Bit error rate
Carrier frequencies
Channels
Computer simulation
Cramer-Rao bounds
Delay estimation
Digital audio broadcasting
Digital video broadcasting
Estimators
Frequency division multiplexing
Frequency estimation
Frequency synchronization
OFDM
Offsets
Orthogonal Frequency Division Multiplexing
Subcarriers
ISSN:0733-8716, 1558-0008
Online Access:Get full text
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Summary:The ability of orthogonal frequency-division multiplexing systems to mitigate frequency-selective channels is impaired by the presence of carrier frequency offsets (CFOs). In this paper, we investigate identifiability issues involving high-resolution techniques that have been proposed for blind CFO estimation based on null subcarriers. We propose new approaches that do not suffer from the lack of identifiability and adopt adaptive algorithms that are computationally feasible. The performance of these techniques in relation to the location of the null subcarriers is also investigated via computer simulations and compared with the modified Cramer-Rao bound.
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ISSN:0733-8716
1558-0008
DOI:10.1109/49.974615