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One of the biggest challenges in ultra-wideband(UWB) radio is the accurate timing acquisition for the receiver.In this article, we develop a novel data-aided synchronizationalgorithm for pulses amplitude modulation (PAM) UWB systems.Pilot and information symbols are transmitted simultaneously byan orthogonal code division multiplexing (OCDM) scheme. Inthe receiver, an algorithm based on the minimum average errorprobability (MAEP) of coherent detector is applied to estimatethe timing offset. The multipath interference (MI) problem fortiming offset estimation is considered. The mean-square-error(MSE) and the bit-error-rate(BER) performances of our proposedscheme are simulated. The results show that our algorithmoutperforms the algorithm based on the maximum correlatoroutput (MCO) in multipath channels.