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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.
Given the information rate, we propose an optimal cooperation (OC) strategy under transcoding and forwarding mechanism. The OC strategy requires that the phase of the relevant signal be strictly synchronized at the destination node, which is hard to achieve. To overcome this shortcoming , An NIO strategy is proposed, which does not need to be synchronized. Compared with OC strategy, NIO strategy is more suitable for the actual relay network, and then proposes a reduction of relay selection with only 2-layer overlay coding Method to achieve the trade-off between complexity and performance.The simulation results show that the performance gap between NIO strategy and OC strategy is very small, only selecting the best two relay nodes is enough even in the case of a large number of nodes Get most of the performance gains from NIO strategy.