基于网络编码的双向中继系统节点选择及功率分配策略

考虑在多个节点间的中继双向信道中,将中继分配和功率分配结合起来.每一对节点间的通信可以看做是通过一个中继的双向中继信道.中继使用网络编码同时向对应的节点发送信息.中继分配考虑了两种分配方案,第一种方案考虑到了所有节点对和中继的排列组合,选取其中性能最好的一组;第二种方案选取所有排列组合中的一部分,选取性能最好的一组.第二种方案略微降低了整个系统的性能,但是大大降低了运算的复杂度.将功率分配策略和这两种方案结合,进一步优化了整个系统的性能,相比较没有加入功率分配的系统,有大约2～3dB的提升.

On the Combination of Relay Assignment and Power Allocation in Two-way Network-coded Cooperative Systems

We considered in this paper combining relay assignment with power allocation for cooperative systems with multiple two-way relay channels.The nodes corresponding to one two-way relay channel communicate with each other through a relay.The relays use network coding to simultaneously transmit the signals corresponding to the pairs they are assigned to.We considered two relay assignment schemes.The first one selects the best one from all possible relay assignment permutations and yields the best performance.The other one considers only a subset of these permutations and selects the best one.The second scheme results in a significant reduction in computations complexity,but causes slightly performance degradation.We combined power allocation with these two schemes to optimize the system performance.Compared to the system without power allocation,this scheme has a 2 ～3 dB increasing.