计算机科学 ›› 2016, Vol. 43 ›› Issue (5): 51-55.doi: 10.11896/j.issn.1002-137X.2016.05.009
张培玲,张洪欣
ZHANG Pei-ling and ZHANG Hong-xin
摘要： 针对电力线信道在传输速率受限、子载波单用户独享和兼顾用户公平性的约束条件下,以余量自适应(MA)为准则,提出一种基于粒子群优化遗传(PSO_GA)联合算法的多用户自适应OFDM系统子载波和比特分配。在此联合算法中利用改进PSO算法中更新粒子速度和位置的思路来重构GA算法中的交叉、变异操作,可克服PSO算法早熟收敛、GA收敛速度慢等问题,能够提高联合算法对全局最优解的搜索能力及收敛速度。在典型电力线衰落信道下的实验结果表明,相比于已有的资源分配算法,基于所提联合算法的系统资源分配方案随着用户数增多,其收敛速度明显加快,且系统所需发射总功率最小,有效地提高了系统通信性能,从而充分证实了所提联合算法的有效性。
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