Distributed decode-forward for multicast
Distributed decode-forward for multicast
复制标题
多播的分布式解码转发
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Young
中科院分区：
文献类型：
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作者：
S. Lim;Kwang Taik Kim;Young
提出了一种新的编码方案，用于在一般中继网络上多播消息，该方案扩展了Ahlswede，Cai，Li和Yeung的图形网络的网络编码和Cover和El Gamal的中继信道的部分解码转发。对于N节点高斯多播网络，该方案实现了0.5N比特的容量，改善了已知的最佳容量差距的结果。其关键思想是在信源处使用多重编码，就像广播信道的Marton编码一样。代替如在原始部分解码转发方案中那样恢复消息的特定部分，所提出的分布式解码转发方案中的中继恢复隐含地携带关于消息的一些信息的辅助索引，并且以块马尔可夫编码转发它。该方案可以适用于在一般中继网络上广播多个消息，扩展和改进了Kannan，Raja和Viswanath最近的结果。
A new coding scheme for multicasting a message over a general relay network is presented that extends both network coding for graphical networks by Ahlswede, Cai, Li, and Yeung, and partial decode-forward for relay channels by Cover and El Gamal. For the N-node Gaussian multicast network, the scheme achieves within 0.5N bits from the capacity, improving upon the best known capacity gap results. The key idea is to use multicoding at the source as in Marton coding for broadcast channels. Instead of recovering a specific part of the message as in the original partial decode-forward scheme, a relay in the proposed distributed decode-forward scheme recovers an auxiliary index that implicitly carries some information about the message and forwards it in block Markov coding. This scheme can be adapted to broadcasting multiple messages over a general relay network, extending and refining a recent result by Kannan, Raja, and Viswanath.