Data relay apparatus, communication apparatus and communication method

摘要

This invention relates to a data relay apparatus, a communication apparatus and a method thereof. The data relay apparatus comprises a first demodulating unit, for demodulating a modulation signal of a first modulation mode from a first transmission source; a second demodulating unit, for demodulating a modulation signal from a second transmission source and having a modulation mode higher in order than the first modulation mode; a combination controlling unit, for providing a mapping rule necessary for performing signal combination in accordance with the modulation mode of the modulation signal from the first transmission source and the modulation mode of the modulation signal from the second transmission source, the mapping rule being rule as how to map the demodulated modulation signal from the first transmission source together with the demodulated modulation signal from the second transmission source to a constellation of symbols of the second modulation mode; and a data combining unit, for performing data combination on the demodulated modulation signal from the first transmission source and the demodulated modulation signal from the second transmission source in accordance with the mapping rule provided by the combination controlling unit.