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A Cooperative Hybrid ARQ Scheme with Adaptive Retransmission  

Kang, Seong-Kyo (경희대학교 전자전파공학과)
Wang, Jin-Soo (경희대학교 전자전파공학과)
Kim, Yun-Hee (경희대학교 전자전파공학과)
Song, Iick-Ho (한국과학기술원 전자전산학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.3A, 2009 , pp. 213-220 More about this Journal
Abstract
Cooperative diversity is a promising technique for range extension and diversity increase without the use of multiple transmit antennas at the user equipment. In this paper, we propose a cooperative hybrid automatic repeat request relay method with adaptive retransmission to increase the throughput when the SNR of a source user is low. In the proposed method, the source user transmits the first segment of a codeword to relay users and a base station. If the base station fails to recover the information from the received packet, it requests the source or some relay users to retransmit the packet previously sent. In addition, the retransmission type of a selected user is chosen from repetition or incremental redundancy according to the quality of systematic bits in a turbo codeword. Simulation results show that the proposed method improves the throughput compared to conventional methods, and the improvement is significant when the source user has a low SNR.
Keywords
협력 다양성;하이브리드 ARQ;적응 재전송;릴레이 전송;터보 부호;
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