Low bias frequency domain SNR estimator using DCT in mobile fading channels

  • Authors:

  • Sungtae Kim;Hyunkyu Yu;Jemin Lee;Daesik Hong

  • Affiliations:

  • Information and Telecommunication Lab., School of Electrical and Electronic Eng., Yonsei Univ., Seoul, Korea;Information and Telecommunication Lab., School of Electrical and Electronic Eng., Yonsei Univ., Seoul, Korea;Information and Telecommunication Lab., School of Electrical and Electronic Eng., Yonsei Univ., Seoul, Korea;Information and Telecommunication Lab., School of Electrical and Electronic Eng., Yonsei Univ., Seoul, Korea

  • Venue:
  • IEEE Transactions on Wireless Communications
  • Year:
  • 2009

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Abstract

The authors analyze the cause of bias in a fast Fourier transform (FFT)-based frequency domain signal-to-noise ratio (SNR) estimator by deriving the upper bound of the bias. The analysis is then used to propose a new frequency domain estimator using discrete cosine transform (DCT), which has lower bias. In addition, a criterion is proposed for use when maximum Doppler frequency information is available; it is based on the derived upper bound and can be used to improve the mean squared error (MSE) performance of the proposed DCT-based estimator. Simulation results show that the proposed estimator reduces the MSE remarkably by diminishing the bias.