适用于无线网络的动态网络编码协作通信机制

Dynamic network-coded cooperation scheme in wireless networks

为在较高频谱利用效率下有效对抗无线媒质衰落,提出一种动态网络编码协作通信机制。该机制将节点转发和网络编码有机结合,中继节点对从多个源节点接收到的信息做动态网络编码,并将编码后信息转发(广播)给相应的目的节点。目的节点利用收到的编码后信息以及其由于无线媒质的广播特性从其它源节点那里接收到的信息解码出需要的数据。数值结果表明:和空时编码协作通信相比,本机制有更好的分集-复用折衷性能,亦可获得满空间分集增益。并且转发节点采用的动态网络编码策略能有效避免因将错误接收到的信息带入编码后的转发信息而导致的错误传播。

A dynamic network coded cooperation （DNCC） scheme was developed to combat slow fading in wireless media at high spectrum efficiencies. The scheme exploits the spatial diversity by pooling node relaying and also network coding in a network to increase the wireless network system perfgrmance. The relay node performs network coding on received information from multiple sources before forwarding the network-coded data towards their destinations, which decode their desired data from the network-coded data and the data they overhear from other sources. The numerical results show that the scheme has a better diversity-multiplexing tradeoff performance than existing cooperative cooperation schemes with a full diversity order. Moreover, with the dynamic network coding mechanism, the scheme avoids error propagation due to incorporating erroneous data into network-coded data.