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中文摘要：
在给定信息速率的条件下,给出了译码转发机制下的最优合作（OC）策略.OC策略需要相关信号的相位在目的节点严格同步,这是很难实现的.为克服此缺点,提出了一种不需要同步的无信息重叠（NIO）策略.与OC策略相比,NIO策略更适合实际的中继网络.进而又提出一种仅包含2层叠加编码的减少中继选择的方法以达到复杂度与性能的折中.仿真结果显示,NIO策略与OC策略之间的性能差距很小,即使在节点数很大的情况下,仅选择2个最好的中继节点就足以获得NIO策略大部分的性能增益.
英文摘要：
Different transmission strategies for decode-and-forward parallel relay networks based on super-position coding are investigated. In particular,an optimal-cooperation （ OC） strategy is proposed to mini-mize the aggregate power consumption for a target transmission rate,which requires strict synchronization at the destination node to achieve its optimal performance. A non-information-overlapping （ NIO） strategy is then proposed to avoid the synchronization problem. Compared with OC strategy,NIO strategy is more suitable for actual relay networks. Furthermore,a reduce-relay-selection method involving only 2-level superposition coding is given to trade off between complexity and performance. Analysis shows that the performance gap between NIO strategy and OC strategy is negligible. the best two relay nodes are selected in adequating to achieve most performance gain of NIO strategy even if the number of relay nodes is large.
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