Preequalizer Design for Spatial Multiplexing SIMO-UWB TR Systems

A spatial multiplexing single-input-multiple-output (SM-SIMO) ultrawideband (UWB) communication system using the time-reversal (TR) technique is proposed in this paper. The system with only one transmit antenna, using a spatial multiplexing scheme, can transmit several independent data streams to achieve a very high data rate. To cope with the long delay spread of the UWB channel, the TR technique is adopted. TR can mitigate not only the intersymbol interference (ISI) but the multistream interference (MSI) caused by multiplexing several data streams simultaneously as well. Preequalization using the channel state information (CSI), which is already available at the transmitter in TR systems, is proposed to further eliminate the ISI and MSI. Simulation results show that the preequalization based on shortened equivalent channels can considerably improve the bit error rate (BER) performance of the system.