Incorporating　Ultra-wide-band　(UWB)　technology　into　multiple　transmit　and　receive　antennas　(MIMO)　is　a　viable　way　to　improve　bit　error　rate　(BER)　performance　for　wireless　communications.　However,　the　large　number　of　antennas　requires　lots　of　expensive　hardware.　To　reduce　the　hardware　cost　and　complexity　while　to　enhance　BER　performance,　in　this　paper,　based　on　knowing　entire　channel　state　information　(CSI)　at　the　transmitter,　we　provide　an　UWB　system　with　transmit　antenna　selection　(TAS).　The　simulation　results　confirm　a　considerable　increase　in　BER　performance　in　UWB　channel.