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Título:
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A performance lower bound for quadratic timing recovery accounting for the symbol transition density
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Autor/a:
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Riba Sagarra, Jaume
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
Abstract:
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The symbol transition density in a digitally modulated signal affects the performance of practical synchronization schemes designed for timing recovery. This paper focuses on the derivation of simple performance limits for the estimation of the time delay of a noisy linearly modulated signal in the presence of various degrees of symbol correlation produced by the various
transition densities in the symbol streams. The paper develops high- and low-signal-to-noise ratio (SNR) approximations of the so-called (Gaussian) unconditional Cramér–Rao bound (UCRB),
as well as general expressions that are applicable in all ranges of SNR. The derived bounds are valid only for the class of quadratic, non-data-aided (NDA) timing recovery schemes. To illustrate the validity of the derived bounds, they are compared with the actual performance achieved by some well-known quadratic NDA timing recovery schemes. The impact of the symbol transition
density on the classical threshold effect present in NDA timing recovery schemes is also analyzed. Previous work on performance
bounds for timing recovery from various authors is generalized and unified in this contribution. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal -Telecommunication systems -Signal processing -- Digital techniques -Bandlimited communication -Correlation methods -Delay estimation -Gaussian processes -Modulation -Practical synchronization scheme -CML -Cramér-Rao bound -CRB -Maximum likelihood estimation -Symbol transition density -Quadratic timing recovery -UML -Noisy linearly modulated signal -SNR -Signal-to-noise ratio approximation -Nondata-aided timing recovery -Bandlimited channels -Digitally modulated signal -Unconditional Cramer-Rao bound -Sistemes de telecomunicació -Processament del senyal -- Tècniques digitals |
Derechos:
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Tipo de documento:
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Artículo |
Editor:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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