Relay Aided Wireless Multicast Utilizing Network Coding: Outage Behaviour and Diversity Gain

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Broadcast nature of wireless networks can be exploited to provide a flexible transmission, especially in multicast service. The potential relay then is capable to participate in message forwarding. In this paper, the authors first presents a Network Coding Based Cooperative (NCBC) multicast scheme exploiting limited feedback, where the source transmits two separate signals to multiple destinations in two successive half slots. The relay may combine the signals if it received two signals correctly and forward it to destinations in the next half slot. The destinations, therefore, can recover signals either from direct transmission or the relay forwarding.