Two-step synchronization for direct-sequence UWB systems with corresponding demodulation scheme

In this paper, a two-step synchronization is firstly presented for direct-sequence (DS) ultra-wideband (UWB) communication systems, and then the corresponding demodulation scheme are proposed. During the synchronization process, the start of individual frames is estimated via simple square and overlap-add operation at the first step. Then the first frame in each symbol is identified by exploiting the cyclic autocorrelation of DS codes at the second step. After synchronizing the received signals, we propose an efficient demodulation scheme which bypasses the complicated channel estimation. Simulations are performed to validate the promising performance of the proposed scheme.