Patent ID: 8311146

Claim:
A radio communication system comprising a radio transmission device, and a radio reception device, for communicating a signal between the radio transmission device and the radio reception device by using multiple carriers, wherein: the radio transmission device comprises: splitting means for splitting an input digital signal into a plurality of channels; modulating means for modulating the digital signal obtained on a channel basis by the splitting performed by the splitting means into a constant-envelope-modulated signal, and converting the constant-envelope-modulated signal into an analog signal; a first frequency converting means for subjecting the constant-envelope-modulated signal, which has been converted into the analog signal on a channel basis by the modulating means, to frequency conversion into a plurality of carrier frequencies in which frequencies in respective adjacent channels are mapped at frequency intervals each set to be less than 3 times as large as a symbol rate of each channel; amplifying means for amplifying the constant-envelope-modulated signal, which has been converted into the analog signal and converted on a channel basis into each of different carrier frequencies by the first frequency converting means, individually with a high efficiency; and transmission means for radio-transmitting the constant-envelope signal, which has been converted into the analog signal and amplified on a channel basis by the amplifying means, into space on the channel basis; and the radio reception device comprises: receiving means for radio-receiving the constant-envelope-modulated signal, which has been converted into the analog signal and radio-transmitted into space; a second frequency converting means for converting the constant-envelope-modulated signal, which has been converted into the analog signal and received by the receiving means, into each of a plurality of baseband frequencies in different channels on a carrier frequency basis, and converting the constant-envelope-modulated signal into a digital signal; demodulating means for demodulating the constant-envelope-modulated signal, which has been converted on the channel basis into the baseband frequency and converted into the digital signal by the second frequency converting means; and restoring means for restoring an original digital signal from the digital signal, which has been demodulated on the channel basis by the demodulating means.