喷泉中继传输网络中基于信道信息和剩余能量的中继选择算法

协作中继传输是无中心节点的无线网络中一种重要的传输方式，中继选择是中继传输中的一个重要问题。采用数字喷泉码的协作中继传输中的中继选择算法，给出了一种中继选择算法。该算法不仅考虑协作中继系统各条链路的信道状态信息，而且考虑中继当前的剩余能量信息。根据源节点到中继及中继到目的节点的信道信息选择出一组中继，再在这组中继中根据剩余能量的顺序，选择出所需要的中继节点。通过对源节点至目的节点总的传输时间和能量消耗的分析和仿真，以及不同门限值及中继节点数对系统性能影响的仿真。结果表明，与只考虑信道状态信息的中继选择算法相比，采用该算法可明显改善网络寿命。

A relay selection algorithm based on channel information and residual energy in fountain relay transmission networks

A new relay selection algorithm employing digital fountain codes that considers both channel state information and current residual energy is proposed in this paper. A set of relays is firstly selected according to the channel information of the links from source to relays and from relays to destination, and then the required relays are chosen from the set based on the order of residual energy. Through theoretical analysis and simulation of the transmission time and energy consumption, as well as simulation of the impact of thresholds and relay numbers on system performance, the results show that the algorithm can significantly improve the network lifetime compared to the relay selection algorithm only considering channel state information.