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Hybrid Forwarding HARQ Scheme for Cooperative Communication in Wireless Networks

In order to reduce the outage probability of cooperative communication, a hybrid forwarding HARQ scheme in wireless network is proposed. In this scheme, if the relay decoding unsuccessfully until the last time, the Amplify-and-Forward protocol will be used to retransmit. Otherwise, the code cooperation will be used. Both of the Chase Combining and Incremental Redundancy combining is used in this scheme. Over the Rayleigh fading channels, the lower bound expressions of outage probability is derived. Furthermore, the simulation shows that the proposed scheme outperforms conventional cooperative HARQ relaying with code cooperation in reducing the outage probability and improving the average throughput.