In the last years a lot of attention has been paid to multi-antenna systems with Space-Time Coding (STC) and to Ultra Wide Band (UWB). In this paper we aim to propose a transceiver scheme in order to evaluate if these two technologies can be considered adequate candidates for next generation WLANs. Merging Ultra Wide Band signals with Multiple Antenna schemes allows us to achieve very high bit rate and error probability matched to QoS requested by 4GWLANs at low SNR. This contribution presents a simple way to combine Ultra Wide Band and Multiple Antenna schemes so to improve performance and coverage with respect to the conventional UWB approach in order to promote this approach application scenarios by considering a base band channel model and selective are considered.