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

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概要

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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.

• 2012-06-01

著者

• ZHANG Zu

  ChongQing University of Posts and Telecommunications (CQUPT)

• WANG Yi

  ChongQing University of Posts and Telecommunications (CQUPT)

• CHEN Qianbin

  ChongQing University of Posts and Telecommunications (CQUPT)

• LONG Ken

  ChongQing University of Posts and Telecommunications (CQUPT)

• TANG Hong

  ChongQing University of Posts and Telecommunications (CQUPT)

• TANG Hong

  Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Post and Communications (CQUPT) and Chong Qing Electric Power Research Institute

• LONG Ken

  Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Post and Communications (CQUPT) and Chong Qing Electric Power Research Institute

関連論文

• Symmetric Extension DFT-Based Noise Variance Estimator in OFDMA Systems with Partial Frequency Response
• Adaptive Coupling Method Based on Optimal Subcarrier Spacing for OFDM System

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