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

This paper investigates code synchronization for arecently proposed code-shifted reference (CSR) impulseradio ultra-wideband (IR-UWB) system. In the CSRscheme every symbol with the code-shifted informationbits is conveyed by several frames and during each frameonly one pulse is transmitted. By assuming that the startof each frame concerning the receiver’s clock is known,two code synchronization algorithms are proposed toestimate the position of the first frame in each symbol andeach algorithm works without using a preamble sequence.The performance of the two algorithms are evaluatedunder IEEE802.15.4a industrial line-of-sight (LOS)scenario. The simulation results reveal that the secondalgorithm with the partial Euclidean distanceminimization outperforms the first algorithm with thedirect searching.