Beata Wysocki Peter Vial, Beata Wysocki, Tad Wysocki, Optimal receiver for Space Time Spreading across a Time Hopping PPM over Ultra Wideband Saleh-Valenzuela MIMO Channel K. Popovski, T. A. Wysocki, B. J. Wysocki, Closed-Form Derivations of ISI and MUI for Time-Reversed Ultra Wideband