Increase data rate while having low power consumption and low computational complexity at the receiver are the key elements for the research in wireless communication for low complexity devices. Sub Terahertz (SubTHz) radio-frequency domain can support ultra-wideband (UWB) communications, and thus the unprecedented increase in the wireless network capacity, that could be the next breakthrough for the next 6G standards. However, the technology of subTHz transceivers is not yet completely mature to apply the same advanced processes as the ones that are currently implemented for microwaves communications. We propose to test the effectiveness of Time Reversal (TR) precoding which is simple and robust processing to focus on time and space UWB waveforms in exploiting the channel diversity. In this paper, we first investigate experimentally the performance of subTHz TR focusing on multiple access transmission scenarios at a high data rate, while keeping the receiver simple and with low computational complexity.