基于负荷平衡的混合式中继选择新算法

现有的中继选择算法通常带来中继负荷失衡问题，可能导致中继节点资源的非公平利用。为解决这个问题，首先对中继负荷失衡问题进行了分析，接着使用链路信噪比和中继节点负荷作为模糊控制的输入参量，提出了负荷平衡中继选择（LBRS）算法；其次，针对LBRS算法中存在的低信噪比区域误比特率偏高的问题，进一步提出了LBRS的改进算法，即基于负荷平衡的混合式中继选择（HRS）算法。仿真结果表明，与典型的最优中继选择（BRS）算法比较，HRS算法在平衡中继节点负荷上具有非常显著的优势，在误比特率性能上稍逊，总的来说是一种性能优异的中继选择算法。

New hybrid relay selection algorithm based on load balancing

The known relay selection methods usually lead to load imbalance at the relay nodes, which may cause unfair utilization of the resources. So the problem of load imbalance at the relay nodes is analyzed and a method of load balancing relay selection (LBRS) is proposed by means of the fuzzy control with the link signal to noise ratio (SNR) and relay load as the inputs. Then, the improved method of LBRS called hybrid relay selection (HRS) method, which improves the bit error rate (BER) performance over LBRS, is proposed to further cope with the problem of higher BER in the low SNR area in LBRS. Simulation results show that compared with the typical method of best relay selection (BRS), HRS has significant advantages in load balances and slightly inferior BER performance at the same time. In all, HRS is an excellent relay selection method.