NDLI: A novel RMS delay-spread estimation technique for wireless OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Athaudage, C.R.N. Jayalath, A.D.S.
Copyright Year	2003
Description	Author affiliation: ARC Special Res. Center for Ultra-Broadband Inf. Networks, Melbourne Univ., Vic., Australia (Athaudage, C.R.N.)
Abstract	This paper presents a novel RMS delay-spread estimation technique for wireless OFDM systems in exponentially decaying multipath power-delay channels. The technique utilizes a correlation function evaluated over the cyclic-prefix of the OFDM signal. The RMS delay-spread is estimated by means of a minimum mean-squared-error (MMSE) fitting between the observed correlation function and its theoretical expectation. Estimation of the symbol timing and frequency offset parameters is also inherent in the technique. Simulation results demonstrate the accuracy of the technique for the cases of (i) with perfect synchronization, and (ii) with synchronization error. In particular, it is shown that an RMS estimation error as low as 1-2 samples can be achieved for RMS delay-spread, for high channel SNR values (>15 dB). Pilot-symbol-assisted OFDM channel estimation techniques, which require the RMS delay-spread of the wireless channel for optimal frequency domain channel response interpolation, can be benefited by the proposed technique.
Sponsorship	Microsoft Res. Asia Singapore Exhibition and Convention Bureau
Starting Page	626
Ending Page	630
File Size	321323
Page Count	5
File Format	PDF
ISBN	0780381858
DOI	10.1109/ICICS.2003.1292529
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-15
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay estimation OFDM Interpolation Frequency estimation AWGN Frequency synchronization Channel estimation Timing Estimation error Frequency domain analysis
Content Type	Text
Resource Type	Article

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