计算机科学 ›› 2015, Vol. 42 ›› Issue (7): 142-145.doi: 10.11896/j.issn.1002-137X.2015.07.031
潘沛生 赵喜凤
PAN Pei-sheng ZHAO Xi-feng
摘要: 针对放大转发(AF)模式下正交频分复用(OFDM)双向中继网络如何提高系统总容量的问题,提出了一种低复杂度的以系统总速率最大化为目标的最优功率分配策略。该策略先建立用户与中继节点间的最优功率分配比例关系,将三层功率最优化问题简化为一层最优化问题,实现了将节点上的功率优化分配问题转化成一种易于处理的形式,以较小的复杂度获得了各节点上分配的功率占所在子载波对上分配的功率的比重;然后利用原对偶内点法求解各子载波间的功率分配问题;最终,求得各节点最优的功率分配。仿真实验表明,所提算法能显著提升系统总速率,且其性能随子载波数的增多而提升。
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