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The UWB-IR (ultra wideband-impulse radio) technology and MIMO system have attracted interest for next generation high rate radio communications. The authors researched IMO-UWB systems using the FDE (frequency domain equalization) technique with the MMSE spatial filtering technique. The UWB system will be used in short range wireless transmissions. Then, we usually have line-of-sight (LOS) environments in the MIMO-UWB systems. The authors conducted propagation measurement and evaluated the transmission performance of MIMO-UWB systems in LOS environments. Then, the authors proposed a timing control scheme for performance improvement. SIC (successive interference canceller) and PIC (parallel interference canceller) are known as better signal separation techniques in MIMO systems. In these techniques, the authors obtain diversity gain subtracting the data detected by a spatial filtering technique from the received signal. Therefore, we can achieve better signal separation performance by the diversity gain. The authors found that the timing control scheme is also needed for the SIC and PIC techniques in LOS MIMO-UWB environments by bit error rate (BER) evaluation. In this paper, the authors show the signal separation performance applying the SIC and PIC techniques with the timing control scheme in LOS environments.