Ultra-Wideband Impulse Radio for Tactical Ad-Hoc Military Communications

摘要

The simple ultra-wideband (UWB) communications receiver structure is especially attractive to applications which require low cost and low power consumption. However, the envisioned simple receiver designs are also fraught with challenges Transmitted Reference (TR) UWB systems have been proposed in the literature as one way to avoid channel estimation while still maintaining a relatively simple receiver structure. In this project, we investigated the performance of TR UWB communication systems in multiple-access environments. We remove the commonly invoked assumption of perfect power control. We investigate the multiple access interference (MAI) of TR UWB systems, as well as frequency- shifted reference (FSR) UWB systems. In this project, we propose and investigate a synchronization procedure which is near-far resistant. By exploiting the structure of interfering power levels, we devise an efficient suppression technique which only requires the knowledge of the spreading code of the desired user. Complex matrix operations required by other techniques found in the CDMA literature are not required in our suppression process. Simulation results validate our proposed near-far resistant synchronization technique and the superior performance is shown when compared to the current literature.