Research On Some Key Techniques In Ultra-wideband Wireless Communication

Ultra-wideband (UWB) communication is a novel short-distance wireless communication technique, by which data are transferred using pulses with very short duration. It has a lot of advantages, such as high transmission rate, low power consumption, robustness to multi-path and so on. Based on IEEE 802.15.3a UWB channel model, an impulse radio UWB communication scheme which can be used in-house is presented. This thesis endeavors to research in depth on signal detection and synchronization acquisition techniques in UWB. The main contributions of the thesis are as follows:1. Through researching on the IEEE 802.15.3a UWB channel model, the characteristics of the channels under various circumstances are simulated. The simulation results demonstrate that UWB channel has the characteristics of dense multi-paths and long time delay.2. After presenting a typical scheme of UWB, the thesis analyzes the necessity of using Rake receivers and Differential receivers, and furthermore proposes two schemes, i.e. DIFF-PAM-UWB and DIFF-PPM-UWB.3. An unstructured channel estimation algorithm with threshold is proposed, and the performance of the Rake receivers both using the ideal and non-ideal channel estimation is simulated and analyzed. The simulation results demonstrate that the channel estimation algorithm is effective.4. The thesis proposes two synchronization acquisition schemes, the one is combining TDT algorithm with slipping correlation for PAM-UWB, and the other is combining TS-TDT algorithm with slipping correlation for PPM-UWB. Simulation results show that the both schemes are available.