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

Athaudage, Chandranath R. N. & Jayalath, Dhammika (2003) A novel RMS delay-spread estimation technique for wireless OFDM systems. In Joint Conference of the Fourth International Conference on Information, Communications and Signal Processing, and the Fourth Pacific Rim Conference on Multimedia, 2003, 15-18 December 2003.

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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.

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ID Code: 13773
Item Type: Conference Paper
Refereed: Yes
Keywords: OFDM, Delay Spread Estimation
DOI: 10.1109/ICICS.2003.1292529
ISBN: 0780381858
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > COMMUNICATIONS TECHNOLOGIES (100500) > Communications Technologies not elsewhere classified (100599)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 16 Jun 2008 00:00
Last Modified: 29 Feb 2012 14:02

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