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Títol: Conditional maximum likelihood timing recovery: estimators and bounds
Autor: Riba Sagarra, Jaume
Sala i Álvarez, Josep
Vázquez Grau, Gregorio
Altres autors/autores: Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
Editorial: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Matèries: Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Processament del senyal
Signal detection
Array signal processing
Asymptotic statistical accuracy
Pulse shaping
Maximum likelihood estimation
Modulation
Signal detection
Synchronisation
Conditional maximum likelihood timing recovery
Timing
Performance bounds
Maximum likelihood estimators
Timing estimation
Digitally modulated signals
Linearly modulated signals
Nondata-aided
Timing-error-detectors
Self-noise free
Conditional Cramer-Rao bound
Modified CRB
Asymptotic statistical accuracy
NDA synchronizers
Closed-form expression
Sensor array processing
Discrete-time signal model
Processament del senyal
Tipus de document: Article
Descripció: This paper is concerned with the derivation of new estimators and performance bounds for the problem of timing estimation of (linearly) digitally modulated signals. The conditional maximum likelihood (CML) method is adopted, in contrast to the classical low-SNR unconditional ML (UML) formulation that is systematically applied in the literature for the derivation of non-data-aided (NDA) timing-error-detectors (TEDs). A new CML TED is derived and proved to be self-noise free, in contrast to the conventional low-SNR-UML TED. In addition, the paper provides a derivation of the conditional Cramér–Rao Bound (CRB ), which is higher (less optimistic) than the modified CRB (MCRB) [which is only reached by decision-directed (DD) methods]. It is shown that the CRB is a lower bound on the asymptotic statistical accuracy of the set of consistent estimators that are quadratic with respect to the received signal. Although the obtained bound is not general, it applies to most NDA synchronizers proposed in the literature. A closed-form expression of the conditional CRB is obtained, and numerical results confirm that the CML TED attains the new bound for moderate to high Eg/No.
Altres identificadors i accés: Riba Sagarra, J.; Sala Alvarez, J.; Vazquez Grau, G. Conditional maximum likelihood timing recovery: estimators and bounds. IEEE Transactions on Signal Processing. 2001, vol. 49, núm. 4 p. 835-850.
1053-587X
http://hdl.handle.net/2117/1522
Disponible al dipòsit:E-prints UPC
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