Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response

Yi WANG; Qianbin CHEN; Ken LONG; Zu Fan ZHANG; Hong TANG

doi:10.1587/transcom.E95.B.2157

Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response

Yi WANG, Qianbin CHEN, Ken LONG, Zu Fan ZHANG, Hong TANG

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A simple DFT-based noise variance estimator for orthogonal frequency division multiplexing access (OFDMA) systems is proposed. The conventional DFT-based estimator differentiates the channel impulse response and noise in the time domain. However, for partial frequency response, its time domain signal will leak to all taps due to the windowing effect. The noise and channel leakage power become mixed. In order to accurately derive the noise power, we propose a novel symmetric extension method to reduce the channel leakage power. This method is based on the improved signal continuity at the boundaries introduced by symmetric extension. Numerical results show that the normalized mean square error (NMSE) of our proposed method is significantly lower than that of the conventional DFT method.

Publication: IEICE TRANSACTIONS on Communications Vol.E95-B No.6 pp.2157-2159

Publication Date: 2012/06/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.E95.B.2157

Type of Manuscript: LETTER

Category: Wireless Communication Technologies

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Yi WANG, Qianbin CHEN, Ken LONG, Zu Fan ZHANG, Hong TANG, "Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response" in IEICE TRANSACTIONS on Communications, vol. E95-B, no. 6, pp. 2157-2159, June 2012, doi: 10.1587/transcom.E95.B.2157.
Abstract: A simple DFT-based noise variance estimator for orthogonal frequency division multiplexing access (OFDMA) systems is proposed. The conventional DFT-based estimator differentiates the channel impulse response and noise in the time domain. However, for partial frequency response, its time domain signal will leak to all taps due to the windowing effect. The noise and channel leakage power become mixed. In order to accurately derive the noise power, we propose a novel symmetric extension method to reduce the channel leakage power. This method is based on the improved signal continuity at the boundaries introduced by symmetric extension. Numerical results show that the normalized mean square error (NMSE) of our proposed method is significantly lower than that of the conventional DFT method.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.E95.B.2157/_p

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@ARTICLE{e95-b_6_2157,
author={Yi WANG, Qianbin CHEN, Ken LONG, Zu Fan ZHANG, Hong TANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response},
year={2012},
volume={E95-B},
number={6},
pages={2157-2159},
abstract={A simple DFT-based noise variance estimator for orthogonal frequency division multiplexing access (OFDMA) systems is proposed. The conventional DFT-based estimator differentiates the channel impulse response and noise in the time domain. However, for partial frequency response, its time domain signal will leak to all taps due to the windowing effect. The noise and channel leakage power become mixed. In order to accurately derive the noise power, we propose a novel symmetric extension method to reduce the channel leakage power. This method is based on the improved signal continuity at the boundaries introduced by symmetric extension. Numerical results show that the normalized mean square error (NMSE) of our proposed method is significantly lower than that of the conventional DFT method.},
keywords={},
doi={10.1587/transcom.E95.B.2157},
ISSN={1745-1345},
month={June},}

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TY - JOUR
TI - Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response
T2 - IEICE TRANSACTIONS on Communications
SP - 2157
EP - 2159
AU - Yi WANG
AU - Qianbin CHEN
AU - Ken LONG
AU - Zu Fan ZHANG
AU - Hong TANG
PY - 2012
DO - 10.1587/transcom.E95.B.2157
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E95-B
IS - 6
JA - IEICE TRANSACTIONS on Communications
Y1 - June 2012
AB - A simple DFT-based noise variance estimator for orthogonal frequency division multiplexing access (OFDMA) systems is proposed. The conventional DFT-based estimator differentiates the channel impulse response and noise in the time domain. However, for partial frequency response, its time domain signal will leak to all taps due to the windowing effect. The noise and channel leakage power become mixed. In order to accurately derive the noise power, we propose a novel symmetric extension method to reduce the channel leakage power. This method is based on the improved signal continuity at the boundaries introduced by symmetric extension. Numerical results show that the normalized mean square error (NMSE) of our proposed method is significantly lower than that of the conventional DFT method.
ER -