Signal Processing - Signal processing in communications
Timing synchronization in decode-and-forward cooperative communication systems
IEEE Transactions on Signal Processing
On performance bounds for timing estimation under fading channels
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
The Cramér-Rao bound for joint parameter estimation of burst-mode QPSK
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
On the performance of estimators for burst-mode offset QPSK
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Near optimal training sequences for low complexity symbol timing estimation in MIMO systems
IEEE Transactions on Communications
Timing estimation and resynchronization for amplify-and- forward communication systems
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
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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 Cramer-Rao bound (CRBc), 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 Es/N o