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This paper proposes a cooperative diversity protocol with truncated Automatic Repeat reQuest (ARQ) for multicast transmission. The proposed method employs SNR threshold based selective relaying for distributed space time block coding for retransmission. Numerical results will show that the proposed method with optimal SNR threshold improves the error and throughput performance remarkably. Cooperative diversity is an efficient technique to extend the coverage and to achieve spatial diversity. However, most of the previous studies have focused on unicast transmission, not on multicast transmission which can support group applications more effectively.
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