NDLI: 1 doppler spread estimation by tracking the delay-subspace for ofdm systems in doubly selective fading channels (811).

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1 doppler spread estimation by tracking the delay-subspace for ofdm systems in doubly selective fading channels (811).

Content Provider	CiteSeerX
Author	Zhao, Xiaochuan Peng, Tao Yang, Ming Wang, Wenbo
Abstract	Abstract—In this paper, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern in doubly selective fading channels. First, the least-squared estimated channel frequency responses on pilot tones are used to generate two auto-correlation matrices with different lags. Then, according to these two matrices, a Doppler dependent parameter is measured. Based on a time-varying multipath channel model, the parameter is expanded and then transformed into a non-linear high-order polynomial equation, from which the maximum Doppler spread is readily solved by using the Newton’s method. The delay-subspace is utilized to reduce the noise that biases the estimator. Besides, the subspace tracking algorithm is adopted as well to automatically update the delay-subspace. Simulation results demonstrate that the proposed algorithm converges for a wide range of SNR’s and Doppler’s. Index Terms—Doppler spread, Estimation, Subspace tracking, OFDM, Doubly selective fading channels, Comb-type pilot.
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Access Restriction	Open
Subject Keyword	Ofdm System Doubly Selective Fading Channel Doppler Spread Estimation Fading Channel Newton Method Simulation Result Index Term Doppler Spread Selective Fading Channel Time-varying Multipath Channel Model Auto-correlation Matrix Different Lag Least-squared Estimated Channel Frequency Response Algorithm Converges Maximum Doppler Spread Doppler Dependent Parameter Wide Range Non-linear High-order Polynomial Equation Comb-type Pilot Pattern Pilot Tone Comb-type Pilot Subspace Tracking
Content Type	Text

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