Performance analysis of dynamic network coding scheme with opportunistic relay

In this paper, we consider a dynamic network coding scheme with opportunistic relay (DNC-OR) for multiple sources multiple relays networks. In DNC-OR, all of the source transmit one´s own data one by one. The selected relay dynamically applies network coding according to whether the source-destination channel from suffers an outage and sends the network-coded data to the destinations. Assume that (denoted as F) the data received from other resources by each destination are reliable, under assumption F and in case the assumption F does not exist, theoretical and numerical results show that DNC-OR can provide superior system outage performance to the network-coded cooperation scheme with dynamic coding mechanism (DC-NCC) proposed by Cong Peng and yields a full diversity order of N + 1 , where N is the number of relay nodes. When the assumption F does not exist, we propose a dynamic network coding (DNC) scheme. The relay takes different actions according to different feedback message. For a network consist of a relay and two source-destination pairs, it is shown that DNC achieves superior diversity-multiplexing tradeoff to conventional cooperation(CC) by theoretical analysis and numerical results. Moreover, DNC-OR can significantly decrease system outage probability.