Ultra-Wideband Interference Suppression in Time Reversal Transmitted-Reference UWB System

摘要

Aiming to improve the performance of transmitted reference(TR) UWB system and mitigate external interference in multipath channel, time reversal(TiR) is employed. The BER performance of TR-UWB systems with and without TiR technology are investigated respectively, and the results imply that the SNR of TR-UWB system is improved about 10dB in multi-path channel with TiR pre-filter than that without TiR pre-filter whilst BER=1E-3. The impacts of the notch filter's parameters on performance of TiR TR-UWB system are investigated. The simulation results show that every increase of 528MHz in the width of notch filter causes 5dB degradation in the performance whilst the depth of notch filter has little influence on it. Finally, BER performance of this system with notch filter is studied in the case of MBOFDM- UWB interference. Results indicate that with ultra-wideband notch filter technology, strong ultra-wideband interference within a bandwidth of 3×528MHz can be mitigated. For BER=1E-2, the signal-to-interference ratio(SIR) of TR-UWB improves 25dB with a notch filter comparing to that without a notch filter. The present work is expected to be useful for the design of the simple and advanced TR-UWB system.