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UWB technology is generally limited to short range applications, due to the strong power limitations imposed by Federal Communications Commission (FCC). In this paper we propose to use MIMO combined with Time Reversal (TR) technology to increase its transmission distance. The performance of such a UWB-MIMO-TR system is analyzed, considering a simple one correlator receiver. Performance comparisons are made among the scenarios of SISO-TR, MISO-TR, and MIMO-TR. The results show that a UWB-MIMO-TR system can achieve a huge power gain, depending on the antenna numbers employed at both the transmitter and the receiver, but still keeps low complexity at the receiver. The performance analysis is based on realistic channels measured in an office environment.