A method of generating an impulse for impulse radio transmission signals and an impulse-radio ultra-wideband transmitter are provided. In one aspect, the method includes distributing input digital data according to time information data and amplitude information data along a first modulation path and a second modulation path, respectively. Pulse position modulation is performed based on the time information data along the first modulation path to define a timing position of the impulse. Pulse amplitude modulation is performed based on the amplitude information data along the second modulation path to define an envelope of the impulse. The input digital data can be distributed according to phase information data along a third modulation path, and phase shift keying modulation can be performed based on the phase information data along the third modulation path to define a phase of a carrier signal of the impulse.