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This paper presents a spectrally efficient distributed coded cooperation based on opportunistic relaying for multi-relay. The proposed scheme chooses the best relay to participate in the cooperation depending on the instantaneous channel information. The authors adopt distributed Rate-compatible punctured convolutional code. The relay operates on DF mode. After the single relay has been chosen, the best relay will cooperate with the source to transmit the codeword. Thus, the proposed scheme only uses two orthogonal subchannels to finish the second part of the codeword. And the spectrum efficiency is greatly improved. Theoretical analysis and simulation results show that, compared with multi-relay coded cooperation scheme, the new scheme can achieve the same performance with low coding and decoding complexity and high spectrum efficiency.
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