Patent ID: 8451939

Claim:
A radio communication apparatus, comprising: a baseband signal generator configured to generate digital data; a clock generator configured to generate 2 N pulse signals corresponding to the digital data having N bits, where N represents an integer being at least two; a selector configured to select one of the 2 N pulse signals generated by the clock generator based on the N-bit digital data generated by the baseband signal generator; a short pulse generator configured to reduce a pulse width of the pulse signal selected by the selector; a band pass filter configured to pass a frequency component included in a pass frequency band and attenuate a frequency component not included in the pass frequency band, the frequency components making up the pulse signal having the pulse width reduced by the short pulse generator; an antenna configured to perform radio transmission of a signal passed through the band pass filter, wherein the 2 N pulse signals include a whole-period non-transmission pulse, a whole-period transmission pulse, and 2 N -2 partial-period transmission pulses, the whole-period non-transmission pulse including a first pulse and a second pulse, the whole-period transmission pulse including a third pulse and a fourth pulse, the 2 N -2 partial-period transmission pulses having approximately the same pulse widths and different phases, when the selector selects the partial-period transmission pulse, the band pass filter outputs a signal having a time width corresponding to part of a period having a 1-symbol length, the signal that the band pass filter outputs when the selector selects a first partial-period transmission pulse included in the 2 N -2 partial-period transmission pulses, and the signal that band pass filter outputs when the selector selects a partial-period transmission pulse other than the first partial-period transmission pulse included in the 2 N -2 partial-period transmission pulses have approximately the same time widths and different phases, when the selector selects the whole-period non-transmission pulse, the band pass filter outputs a signal attenuated by offsetting a signal corresponding to the first pulse and a signal corresponding to the second pulse, and when the selector selects the whole-period transmission pulse, the band pass filter outputs a signal having a time width corresponding to a whole of the period having the 1-symbol length.