关键词: 网络编码，实时，战术数据，多播，贪心算法

Abstract: Network coding technique is used to the multicast of tactical scene, which is abstracted in this paper. And based on analyzing the characteristic of this network with central node and many-to-all traffic, a transmission policy based on coding only upon the central node and corresponding greedy algorithm were proposed. The up-bound of theoretic gain for the transmission policy based on network coding was analyzed, and simulation results show that the gain of greedy algorithm is close to the optimum. Finally, the analyzing and simulation results provide important insights that the proposed policy based on network coding has better real-time performance than the classical policy in the multicast application.

Key words: Network coding, Real-time, Tactical data, Multicast, Greedy algorithm