基于改进智能水滴算法的多用户OFDMA系统资源分配

在正交频分多址(OFDMA)系统中,合理的资源分配对于提升系统的性能具有重要的意义.针对多用户OFDMA系统,对最大化系统容量为目标的资源分配算法进行研究,提出了一种基于智能水滴算法的无向全连通图资源分配模型,以无向全连通图的顶点集和边集来描述用户与子载波之间的匹配关系.在此基础上,进一步对智能水滴算法进行改进.仿真结果表明,在满足用户比例公平性的条件下,与蚁群算法相比,基于改进智能水滴算法的全连通图分配方案能够提高2.17%~4.91%的系统速率,同时具有更快的收敛速度,提高了系统性能.

Resource allocation with improved intelligent water drops algorithm in multi-user OFDMA system

Reasonable resource allocation for orthogonal frequency division multiple access( OFDMA) sys―tems plays an important role in enhancing system performance. For a multi-user OFDMA system,the re―source allocation algorithm with maximizing system capacity as target is researched deeply. And then,a re―source allocation model of undirected full connection graph on intelligent drops algorithm is proposed,and the matching relationship can be expressed through vertices and edges sets of undirected full connection graph. Finally,the intelligent water drops algorithm is further improved. The simulation results indicate that under the condition of meeting user proportion fairness,compared with ant colony algorithm,the pro―posed full connection graph resource allocation scheme based on improved intelligent water drops algorithm can increase system rate of 2. 17% ~4. 91%. At the same time,it is in possession of faster convergence speed and enhances system performance.