Algorithms of Channel Estimation and Tracking in MB-OFDM UWB System

In this paper, we analyze the system and channel characteristic based on Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra Wide-Band (UWB), and propose the corresponding improved channel estimation and tracking algorithms. The proposed channel estimation algorithm which is based on the improved DFT algorithm is quite suitable for the low SNR environment. It conditionally cuts the paths with little energy within the window, then decreases the infection caused by noise. The proposed channel tracking algorithm aimed at the considerable performance damage coursed by frequency offset conquers the sparseness of pilots, tracks and corrects the amplitude attenuation and phase rotation coursed by frequency offset. The simulation between improved and traditional algorithms is carried out and the results show that better performance can be achieved.