NDLI: Pilot signal design via constrained optimization with application to delay-Doppler shift estimation in OFDM systems

Content Provider	IEEE Xplore Digital Library
Author	Lishuai Jing Pedersen, T. Fleury, B.H.
Copyright Year	2013
Description	Author affiliation: Dept. of Electron. Syst., Aalborg Univ., Aalborg, Denmark (Lishuai Jing; Pedersen, T.; Fleury, B.H.)
Abstract	We address the problem of searching for the optimal pilot signal, i.e. pattern and signature, of an orthogonal frequency-division multiplexing (OFDM) system when the purpose is to estimate the delay and Doppler shift under the assumption of a single-path propagation channel. This problem is relevant for synchronization and for time-based localization using said signals. We propose to use the Cramér-Rao bound and the normalized side-lobe level (NSL) of the ambiguity function as figures of merit to devise the pilot signals. We formulate the design problem as a constrained optimization problem for which we propose a genetic algorithm that computes close-to-optimal solutions. Simulation results demonstrate that the proposed algorithm can efficiently find pilot signals that outperform the state-of-the-art pilot signals in both single-path and multipath propagation scenarios. In addition, we demonstrate that data interference causes a performance loss if a standard non-coherent correlator is used. The results also indicate that the pilot pattern impacts the estimator's performance more than the pilot signature.
Sponsorship	IEEE Cont. Syst. Soc.
Starting Page	160
Ending Page	166
File Size	720373
Page Count	7
File Format	PDF
e-ISBN	9781479934102
DOI	10.1109/Allerton.2013.6736519
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Doppler shift Algorithm design and analysis OFDM Estimation Delays Optimization Genetic algorithms
Content Type	Text
Resource Type	Article

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