Patent ID: 8913542

Claim:
A radio communication system comprising: a first radio communication apparatus configured to transmit first data in a first phase using a first radio channel resource, and to transmit second data in a second phase using a second radio channel resource; a second radio communication apparatus configured to receive the first data from the first radio communication apparatus during the first phase, to generate relayed data, wherein the relayed data comprises the first data and to transmit the relayed data using the second radio channel resource during the second phase; and a third radio communication apparatus, wherein the third radio communication apparatus includes at least; a receiver, a controller, a first switch, a first demodulator, a first decoder, a buffer memory, a second switch, an encoder, a modulator, a canceler, a second demodulator, and a second decoder, wherein the controller is configured to decide whether a received signal is transmitted in the first phase or transmitted in the second phase, the first switch is configured to guide the received signal to the first demodulator when the received signal is transmitted in the first phase, and to guide the received signal to the canceller when the received signal is transmitted in the second phase, the first demodulator is configured to demodulate the received signal to generate a first demodulated signal, the first decoder is configured to decode the first demodulated signal to generate first decoded data, the buffer memory is configured to store the first decoded data, the second switch is configured to guide the first decoded data stored in the buffer memory to the encoder when the received signal is transmitted in the second phase, the encoder is configured to encode the first decoded data to generate re-encoded data, the modulator is configured to modulate the re-encoded data to generate a re-modulated signal, the canceller is configured to extract a target signal from the received signal transmitted in the second phase by subtracting the re-modulated signal from an output signal of the first switch, the second demodulator is configured to demodulate the extracted target signal to generate a second demodulated signal, and the second decoder is configured to decode the second demodulated signal to obtain the second data.