Abstract:

In order to overcome the long mean acquisition time （MAT） and the low acquisition precision resulting from the multipath narrow pulse in the time-hopping ultra-wide band （UWB） system, a synchronization acquisition scheme with variable step size is proposed. In this scheme, the nonconsecutive search and various thresholds are employed to effectively adjust the searching step size, and the searching process follows the steps from coarse to re- fined. The MAT performances of the proposed scheme are then analyzed and compared with those of the conventional acquisition schemes via a simulation of a pulse-based time-hopping UWB system. The results indicate that, as compared with the conventional schemes, the proposed acquisition scheme significantly saves the MAT and improves the acquisition precision.

Key words: roadband network, synchronization, data acquisition