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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。
In order to effectively combat the fading of wireless media with higher spectrum utilization efficiency, a dynamic network coding cooperative communication mechanism is proposed. The mechanism combines node forwarding with network coding. The relay node performs dynamic network coding on the information received from multiple source nodes and forwards (broadcasts) the encoded information to the corresponding destination node. The destination node uses the received encoded information and its received information from other source nodes due to the broadcast nature of the wireless medium to decode the required data. The numerical results show that the proposed scheme has better diversity-reuse trade-off performance and full space diversity gain than space-time coded cooperative communication. And the dynamic network coding strategy adopted by the forwarding node can effectively avoid the error propagation caused by the erroneously received information into the encoded forwarding information.