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

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..

[1]  Todor Cooklev,et al.  Air Interface for Fixed Broadband Wireless Access Systems , 2004 .

[2]  Fang Xu Algorithm to Remove Spectral Leakage, Close-in Noise, and Its Application to Converter Test , 2006, 2006 IEEE Instrumentation and Measurement Technology Conference Proceedings.

[3]  Norman C. Beaulieu,et al.  Estimation of Ricean K parameter and local average SNR from noisy correlated channel samples , 2007, IEEE Transactions on Wireless Communications.

[4]  Norman C. Beaulieu,et al.  Maximum likelihood estimation of local average SNR in Rician fading channels , 2005, IEEE Communications Letters.

[5]  Petre Stoica,et al.  Introduction to spectral analysis , 1997 .

[6]  KyungHi Chang,et al.  A Novel Two-Step Channel-Prediction Technique for Supporting Adaptive Transmission in OFDM/FDD System , 2008, IEEE Transactions on Vehicular Technology.

[7]  You Xiaohu,et al.  A scheme for the SNR estimation and its application in Doppler shift estimation of mobile communication systems , 2004, IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004.

[8]  Sungtae Kim,et al.  Improved Frequency Domain SNR Estimator Using DCT in Mobile Fading Channels , 2006, 2006 IEEE 63rd Vehicular Technology Conference.

[9]  S. V. Narasimhan,et al.  A new spectral estimator based on discrete cosine transform and modified group delay , 2003, TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region.

[10]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[11]  Barry G. Evans,et al.  Simple SNR estimator for mobile fading channels , 2003 .