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Time domain measurements are conducted for ultra-wideband (UWB) signals in a reverberation chamber (RC) and in a typical indoor environment for a single input multiple output (SIMO) time reversal (TR) system. Channel estimation is carried out using an Arbitrary Waveform Generator (AWG) and a high speed Digital Storage Oscilloscope (DSO) for all transmitter receiver links. The measured channel impulse responses (CIR) of all the links are added and re-transmitted from the transmitting antenna. Upon reaching the receiving antennas, the received signals are added to form the eventual received signal. Different TR characteristics i.e. TR peak performance, TR focusing gain, average power increase, signal to side lobe ratio (SSR) and RMS delay spread are analyzed and compared to that of a single input single output (SISO) TR system.