面向多源多目标协作网络的中继选择方法

Relay selection methods for multi-source and multi-destination cooperative networks

在多源多目标无线网络中采用最佳中继协作方法时,多个通信对有可能同时选择同一个节点作为最佳中继来进行协作传输,从而导致最佳中继冲突问题,进而对系统的协作性能产生严重影响。为了解决这一问题,提出了两种低冲突的中继选择方法,并将其扩展至功率可分配场景;同时,还提出了一种支持功率分配的分布式选择方法。仿真结果表明,所提方法在保证系统分集增益不变条件下,相比于已有方法,显著降低了中继冲突情况发生,改善了系统协作效果;并在性能接近于最优方法的前提下,有效降低了中继选择方法的复杂度。

In multi-source and multi-destination wireless networks, the source-destination pairs may choose the same node as the best relay for cooperative transmission by the best relay cooperative technology, which leads to the best relay collision problem and severely affects the cooperative performance of systems. In order to solve this problem, two low conflict relay selection methods are proposed and extended to the power distribution situation. Meanwhile, a distributed method with power distribution is also proposed. Simulation results show that, compare to previous methods, the proposed methods can reduce conflict significantly and improve the sys- tem performance with the diversity gain unchanged. Furthermore, in comparison with the optimal algorithm, the proposed methods have lower complexity with the nearly same performance.