Efficient tracking design in UWB communication systems

Synchronization process is considered as a major challenge for ultra-wideband (UWB) communication systems. Delay-Locked Loop (DLL) method is widely used to maintain the satisfactory timing synchronization and reduce timing offset error between the received and reference signals. In this paper, we propose a novel strategy to design DLL structure, based on Internal Model Control (IMC) concept. Primary simulation results confirm that the proposed DLL tracking works efficiently in the absence of Doppler Effect. However, the loss of tracking may arise with Doppler Effect. To solve this problem, we suggest two different approaches to develop the IMC-DLL structure: The first approach is based on Model-shifter concept, while the second is based on adaptive filter algorithms. The simulation results compare the performance of these proposed approaches with the classical DLL.