Abstract: In order to overcome the shortcomings of decode-and-forward and amplify-and-forward transmission, a multi-relay hybrid-forwarding cooperative transmission scheme (MRHF-CTS) was proposed to optimize the performance of cooperative communication system, which selects the style of forwarding according to the result of decoding at relay nodes and uses the broadcast channels among relay nodes to improve the transmission reliability of multi-relay wireless networks. hhe performance characterizations in terms of outage probabilities arc developed. The results show that in contrast to decode-and-forward and amplify-and-forward scheme, MRHF-CTS offers a superior performance. And in the high signal-to-noise ratio (SNR) regime,the optimal performance of decodcand-forward transmission is gained.

Key words: Wireless network, Cooperative communication, Diversity gain, Decode-and-forward, Amplify-and-forward