How could I measure the effect of the multi-path in UWB DUT

Dear all,

Could anyone teach me how could I measure the multi-path effect of my tested circuit? Multi-path means the RF circuit receive more than 2 same signals in different path from a single transmitted signal source. Is there are any testing equipment could emulate this effect? Could you introduce this machine to me? I am doing OFDM UWB circuit.

Thanks

CHI