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Delay Spread and Time Dispersion Estimation for Adaptive OFDM Systems
 

Summary: Delay Spread and Time Dispersion Estimation for
Adaptive OFDM Systems
Tevfik Y¨ucek and H¨useyin Arslan
Department of Electrical Engineering, University of South Florida
Abstract-- Time dispersion is one of the most important
characteristics of the wireless channel. The knowledge about the
time dispersion of a channel can be used for designing better
systems which can adapt themselves to the changing nature of
the transmission medium. In this paper, algorithms for estimating
the time dispersion (frequency selectivity) of the channel, which
use the frequency domain channel estimates or the frequency
domain received signal, are proposed. The proposed algorithms
first estimate the power delay profile (PDP) from which the
two important dispersion parameters, namely root-mean-squared
(RMS) delay spread and maximum excess delay of the channel,
are estimated. It is shown that synchronization errors bias the
performance of the estimators based on the channel correlation,
and this bias is removed by obtaining the PDP using the
magnitude of the channel estimates. The performances of the
proposed algorithms are evaluated using computer simulations.

  

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

 

Collections: Engineering