Non-Data-Aided Code Synchronization for the Code-Shifted Reference Ultra-Wideband (UWB) System

This paper investigates code synchronization for a recently proposed code-shifted reference (CSR) impulse radio ultra-wideband (IR-UWB) system. In the CSR scheme every symbol with the code-shifted information bits is conveyed by several frames and during each frame only one pulse is transmitted. By assuming that the start of each frame concerning the receiver´s clock is known,two code synchronization algorithms are proposed to estimate the position of the first frame in each symbol and each algorithm works without using a preamble sequence.The performance of the two algorithms are evaluated under IEEE802.15.4a industrial line-of-sight (LOS)scenario. The simulation results reveal that the second algorithm with the partial Euclidean distance minimization outperforms the first algorithm with the direct searching.