Received signal with N.paths (1/2) -2-2pe四 In the narrowband case the new signal at the Rx is still a sinusoid,but with amplitude and phase given by the coherent sum(1).Time does not appear. In the wideband case,i.e.when a transmitted signal is modulated on the carrier we have to include the MO-DEM and consider the time domain Tx Rx u0中Mo x(t)Propagation channel Radio Channel_IR = IR i i=1 Nr ∑ = ρi e jϑi i=1 Nr ∑ (1) • In the narrowband case the new signal at the Rx is still a sinusoid, but with amplitude and phase given by the coherent sum (1). Time does not appear. • In the wideband case, i.e. when a transmitted signal is modulated on the carrier we have to include the MO-DEM and consider the time domain. Received signal with Nr paths (1/2) Tx Rx Radio Channel Propagation channel u(t) MO- DEM- v(t) x(t) y(t) IT IR