Patent ID: 8102895

Claim:
A radio transmission apparatus that uses a plurality of band groups and that transmits a signal subjected to frequency hopping between a plurality of bands in each band group at a local frequency apart from the center frequency of each band, the radio transmission apparatus comprising: a local frequency generating unit that generates a local frequency lower than the center frequency of each band in a first band group in a transmission with the first band group, wherein the local frequency generating unit generates a local frequency higher than the center frequency of each band in a second band group in a transmission with the second band group, the local frequency to be generated being the same as the local frequency generated in the transmission with the first band group, wherein the center frequency of one band in the first band group is the same as the center frequency of one band in a third band group whose bandwidth is adjacent to the one band of the first band group; wherein the local frequency generating unit includes a frequency synthesizer that receives a first frequency at a first input and receives a second frequency corresponding to the distance between two adjacent bands or a third frequency corresponding to the distance between the bands at both ends among three adjacent bands at a second input, the first frequency corresponding to the frequency that is the same as the local frequency generated in the transmission with the first band group and being the local frequency apart from the center frequency of each band; and wherein the local frequency generating unit includes a first frequency generator generating the second frequency by digital waveform synthesis and a second frequency generator generating the third frequency by the digital waveform synthesis.