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层间等级网络编码是一种联合利用信源分层编码与组播间线性网络编码优势的多速率线性网络编码技术。与分层组播网络编码相比,层间等级网络编码能够进一步提高异构信宿网络的资源利用效率。然而,网络中各链路上进行的编码类型,是影响层间等级网络编码多速率传输性能的决定性因素。本文面向单信源异构信宿网络,研究层间等级网络编码的优化;基于微分进化算法,提出了一种最优编码类型配置的快速搜索方案。该方案充分体现了信源输出链路上进行的层间等级网络编码对整个网络传输性能的影响;具体设计了符合层间等级网络编码本质特性的微分进化操作。实验结果表明,与现有的启发式算法相比,本文提出的基于微分进化算法的层间等级网络编码优化方案,能够为单信源异构信宿网络获得更高的网络总吞吐量。
Interlevel level network coding is a multi-rate linear network coding technique that combines the advantages of source layered coding and linear network coding among multicasts. Compared with the hierarchical multicast network coding, the hierarchical level network coding can further improve the resource utilization efficiency of the heterogeneous sink network. However, the type of coding performed on each link in the network is a decisive factor affecting the performance of multi-rate transmission at the inter-level network coding. This paper focuses on the single-source heterogeneous sink network, and studies the optimization of the hierarchical hierarchical network coding. Based on the differential evolution algorithm, a fast search scheme of optimal coding type configuration is proposed. The scheme fully embodies the influence of layer-by-layer network coding on the output link of the source on the transmission performance of the whole network. The differential evolution operation that conforms to the nature of layer-by-layer network coding is specifically designed. The experimental results show that compared with the existing heuristic algorithms, the proposed hierarchical hierarchical network coding optimization scheme based on differential evolution algorithm can achieve higher total network throughput for single-source heterogeneous sink network.