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Phase noise estimation and compensation for OFDM systems: a DCT based approach

Jabran Bhatti, Nele Noels UGent and Marc Moeneclaey UGent (2010) IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS PROCEEDINGS. 11. p.93-97
abstract
We present an improved estimator of the phase noise theta(t) in OFDM systems, based on the approximation of the timevarying phasor exp(jtheta(t)) by a discrete-cosine transform (DCT) basis expansion, containing only a few terms. Using pilot symbols, an initial least-squares estimate of the phase noise is obtained. The initial estimate is iteratively improved by also exploiting the soft decisions from the data symbols, obtained in a previous iteration. We demonstrate that the resulting (linearized) meansquare estimation error consists of two contributions: a contribution from the additive channel noise, that equals the modified Cramer-Rao lower bound when the soft decisions are assumed to equal the true data symbols, and a contribution that results from the phase noise modeling error. The modified Cramer-Rao lower bound is shown to be proportional to the number of estimated DCT coefficients. Performance can be optimized by a proper selection of the number of DCT coefficients in the expansion of the phasor. Iterative soft-decision-directed phase noise estimation yields a considerable performance improvement as compared to estimation using only pilot symbols. For an OFDM system with strong phase noise, the BER performance degradation resulting from the proposed scheme is limited to about 1 dB only.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
in
IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS PROCEEDINGS
IEEE Int. Symp. Spread Spectr. Techn. Appl. Proc.
volume
11
issue title
ISSSTA 2010 : IEEE 11th International symposium on Spread Spectrum Techniques and Applications
pages
93 - 97
publisher
IEEE
place of publication
New York, NY, USA
conference name
2010 IEEE 11th International symposium on Spread Spectrum Techniques and Applications (ISSSTA 2010)
conference location
Taichung, Taiwan
conference start
2010-10-17
conference end
2010-10-20
ISSN
1943-7439
ISBN
9781424460137
9781424460144
DOI
10.1109/ISSSTA.2010.5649866
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1065253
handle
http://hdl.handle.net/1854/LU-1065253
date created
2010-10-26 15:43:00
date last changed
2017-01-02 09:52:45
@inproceedings{1065253,
  abstract     = {We present an improved estimator of the phase noise theta(t) in OFDM systems, based on the approximation of the timevarying phasor exp(jtheta(t)) by a discrete-cosine transform (DCT) basis expansion, containing only a few terms. Using pilot symbols, an initial least-squares estimate of the phase noise is obtained. The initial estimate is iteratively improved by also exploiting the soft decisions from the data symbols, obtained in a previous iteration. We demonstrate that the resulting (linearized) meansquare estimation error consists of two contributions: a contribution from the additive channel noise, that equals the modified Cramer-Rao lower bound when the soft decisions are assumed to equal the true data symbols, and a contribution that results from the phase noise modeling error. The modified Cramer-Rao lower bound is shown to be proportional to the number of estimated DCT coefficients. Performance can be optimized by a proper selection of the number of DCT coefficients in the expansion of the phasor. Iterative soft-decision-directed phase noise estimation yields a considerable performance improvement as compared to estimation using only pilot symbols. For an OFDM system with strong phase noise, the BER performance degradation resulting from the proposed scheme is limited to about 1 dB only.},
  author       = {Bhatti, Jabran and Noels, Nele and Moeneclaey, Marc},
  booktitle    = {IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS PROCEEDINGS},
  isbn         = {9781424460137},
  issn         = {1943-7439},
  language     = {eng},
  location     = {Taichung, Taiwan},
  pages        = {93--97},
  publisher    = {IEEE},
  title        = {Phase noise estimation and compensation for OFDM systems: a DCT based approach},
  url          = {http://dx.doi.org/10.1109/ISSSTA.2010.5649866},
  volume       = {11},
  year         = {2010},
}

Chicago
Bhatti, Jabran, Nele Noels, and Marc Moeneclaey. 2010. “Phase Noise Estimation and Compensation for OFDM Systems: a DCT Based Approach.” In Ieee International Symposium on Spread Spectrum Techniques and Applications Proceedings, 11:93–97. New York, NY, USA: IEEE.
APA
Bhatti, J., Noels, N., & Moeneclaey, M. (2010). Phase noise estimation and compensation for OFDM systems: a DCT based approach. IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS PROCEEDINGS (Vol. 11, pp. 93–97). Presented at the 2010 IEEE 11th International symposium on Spread Spectrum Techniques and Applications (ISSSTA 2010), New York, NY, USA: IEEE.
Vancouver
1.
Bhatti J, Noels N, Moeneclaey M. Phase noise estimation and compensation for OFDM systems: a DCT based approach. IEEE INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS PROCEEDINGS. New York, NY, USA: IEEE; 2010. p. 93–7.
MLA
Bhatti, Jabran, Nele Noels, and Marc Moeneclaey. “Phase Noise Estimation and Compensation for OFDM Systems: a DCT Based Approach.” Ieee International Symposium on Spread Spectrum Techniques and Applications Proceedings. Vol. 11. New York, NY, USA: IEEE, 2010. 93–97. Print.