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

Lishuai Jing, Troels Pedersen, Bernard Henri Fleury

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Abstrakt

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.
OriginalsprogEngelsk
Titel51st Annual Allerton Conference on Communication, Control, and Computing
Antal sider7
ForlagIEEE
Publikationsdato2013
Sider160-166
ISBN (Trykt)978-1-4799-3409-6
DOI
StatusUdgivet - 2013
Begivenhed51st Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2013 - Monticello, IL, USA
Varighed: 2 okt. 20134 okt. 2013
Konferencens nummer: 51

Konference

Konference51st Annual Allerton Conference on Communication, Control, and Computing (Allerton), 2013
Nummer51
LandUSA
ByMonticello, IL
Periode02/10/201304/10/2013

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