Disclosed are ultra wideband radio transmitter, ultra wideband radio
receiver, and ultra wideband radio communication method capable of
securing higher transfer rate and communication quality than conventional
ones while avoiding a band where communication signals are concentrated,
and capable of miniaturizing an antenna. In a transmitter, a delay time
controller (12) outputs a periodic pulse to matched filters 11-1 and 11-2
when transmission data is 1, and outputs the periodic pulse to matched
filters 11-1 and 11-3 when the transmission data is 0. The matched filter
11-1 outputs reference signal, the matched filter 11-2 outputs first data
signal ahead of the reference signal, and the matched filter 11-3 outputs
second data signal behind the reference signal. An adder (13) adds up
these, a mixer (21) frequency-converts output of the adder using a local
signal received from a local oscillator (23), and an antenna (6) radiates
output of the mixer (21).