Uwb transmission apparatus and uwb transmission method

An ultra wideband transmitting apparatus that enables transmission in amplitude shift keying modulation mode and transmission in quadrature phase shift keying modulation mode, the ultra wideband transmitting apparatus comprising:

• a selecting section that selects one of the amplitude shift keying modulation mode and the quadrature phase shift keying modulation mode;
• and
• a transmission signal forming section that, when selected mode is the amplitude shift keying modulation mode, generates an amplitude shift keying modulation signal using a first value as an amplitude level, by forming a symbol located in an original point on an in-phase and quadrature plane, or generates an amplitude shift keying modulation signal using a second value as an amplitude level, by forming a symbol located over time to two or more of four signal points on the in-phase and quadrature plane in quadrature phase shift keying modulation, according to one bit data and, when the selected mode is the quadrature phase shift keying modulation mode, generates a quadrature phase shift keying modulation signal by forming a symbol located in one of the four signal points on the in-phase and quadrature plane in the quadrature phase shift keying modulation, according to two bit data.

The ultra wideband transmitting apparatus according to claim 5, wherein:

• the π/2 phase shifter comprises a switching section that, when the selected mode is the amplitude shift keying modulation mode, outputs the carrier to the second multiplier;
• and
• when the selected mode is the amplitude shift keying modulation mode, the mapping section sets to the quadrature component the in-phase component of the symbol and a component equal to the in-phase component.

An ultra wideband transmitting method of enabling transmission in amplitude shift keying modulation mode and transmission in quadrature phase shift keying modulation mode, the ultra wideband transmitting method comprising the steps of:

• selecting one of the amplitude shift keying modulation mode and the quadrature phase shift keying modulation mode;
• and
• when selected mode is the amplitude shift keying modulation mode, generating an amplitude shift keying modulation signal using a first value as an amplitude level, by forming a symbol located in an original point on an in-phase and quadrature plane, or generating an amplitude shift keying modulation signal using a second value as an amplitude level, by forming a symbol located over time to two or more of four signal points on the in-phase and quadrature plane in phase modulation, according to one bit data and, when the selected mode is the quadrature phase shift keying modulation mode, generating a quadrature phase shift keying modulation signal by forming the symbol located in one of the four signal points on the in-phase and quadrature plane in the quadrature phase shift keying modulation, according to the two bit data.