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Doppler Spread Estimation for Wireless OFDM Tevfik Yucek, Ramy M. A. Tannious, and Huseyin Arslan
 

Summary: Doppler Spread Estimation for Wireless OFDM
Systems
Tevfik Y¨ucek, Ramy M. A. Tannious, and H¨useyin Arslan
Department of Electrical Engineering, University of South Florida
4202 E. Fowler Avenue, ENB-118, Tampa, FL, 33620
Abstract-- In this paper, we present a method for estimating
the Doppler spread in mobile orthogonal frequency division
multiplexing (OFDM) systems. The estimation is based on finding
the autocorrelation function of time domain channel estimates
over several OFDM symbols. In OFDM systems channel esti-
mation is popularly performed in frequency domain. Channel
frequency response estimates are affected by noise and inter-
carrier interference (ICI). As a result, Doppler estimates based on
frequency domain channel estimates will be affected significantly.
We show that use of channel estimates in time domain can
greatly improve the performance of Doppler estimates. The
channel impulse response (CIR) can be obtained by taking IDFT
of the channel frequency response (CFR). Consequently the
proposed method will reduce processing time and memory usage.
Computer simulations support our claim for a broad range of

  

Source: Arslan, Hüseyin - Department of Electrical Engineering, University of South Florida

 

Collections: Engineering