The experiments of time reversal (TR) technique with ultra-wideband (UWB) signals are conducted in indoor propagation channel by using time-domain technique. The UWB propagation channel response of a typical indoor environment is measured and time reversal technique is applied for signal transmission. The characteristics of the TR scheme for different propagation scenarios, line-of-sight (LOS) and non-LOS with different wideband receiving antennas are evaluated. The measurement results of signals focusing gain, temporal sidelobes and average signal energy for different propagation scenarios are presented. The spectral analysis of TR-UWB signals is conducted and an inherent bandwidth limit of the classical TR-UWB scheme is observed. To overcome the bandwidth restrictions, novel design architecture is proposed. The new design adjusts the TR signal by a way to support ultra-wide bandwidth and provides better matching to the UWB spectral mask with better temporal focusing features.
Modified time reversalMultipath propagationSpectral analysisTime reversalUltra wideband