Radio transmission apparatus, radio communication base station apparatus, radio communication mobile station apparatus, and transmission signal generating method

A radio transmission apparatus that transmits a transmission signal with a plurality of subcarriers, the apparatus comprising:

• an encoding section that encodes a transmission bit to generate a first bit sequence, the first bit sequence comprising a systematic bit and a parity bit, the systematic bit being a repetition source;
• a repetition section that repeats the systematic bit included in the first bit sequence to generate a second bit sequence, the second bit sequence comprising a first systematic bit and a second systematic bit, the first systematic bit corresponding to the repetition source, and the second systematic bit being generated by the repetition;
• a modulation section that modulates the second bit sequence to generate a plurality of first symbols from the first systematic bit and the second systematic bit, the first symbols being the same as second symbols that are generated only from the first systematic bit;
• and
• a generating section that generates the transmission signal by mapping the plurality of the first symbols on the plurality of subcarriers according to a first mapping pattern which is the same as a second mapping pattern of other radio transmitting apparatuses.