非正交选择译码转发协同
doi: 10.3724/SP.J.1146.2007.00128
Non-orthogonal Decode-and-forward Cooperation with Selection Relays
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摘要: 为了提高两跳中继网络的传输速率和协同分集增益，该文提出一种非正交的选择译码转发策略传输数据。单节点协同时，协同节点仅在正确译码时采用和发送节点非正交的时序转发；在多节点协同时，采用一种节点选择算法选择译码正确且信道条件最佳的节点用于非正交转发。这种协同策略可获得和非正交放大转发相同的分集复用折衷性能，但其实现更简单，且在低信噪比时中断性能更好。Abstract: A non-orthogonal decode-and-forward scheme with relay selection is proposed in order to achieve higher spectral efficiency and more cooperative diversity gain in the two-hop relay networks. In the single relay case, the relay node is available to cooperate non-orthogonally with the source node only if it can decode correctly. When there are multiple nodes in the network, a relay selection method is given to select the best relay which decodes correctly and has the best channel to destination. Asymptotic analysis of outage probability shows that the scheme with relay selection achieves the same diversity-multiplexing tradeoff as the non-orthogonal amplify-and-forward scheme, but it obtains more outage capacity at lower SNR and is easier to implement.
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