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。
In order to improve the system sum-capacity of amplify-and-forward scheme for two-way relaying over orthogonal frequency division multiplexing（OFDM）,this paper developed a new power allocation strategy with low complexity to maximize the total system rate.This strategy firstly builds a linear power relation between S-R and R-S to simplify the optimization problem from three layers to a layer,so the power allocation problem can be reformulated into a more tractable form and the power proportion between each node and the sub-carrier is obtained with low complexity.Then under the total power constraint,it employes the primal-dual interior-point methods to obtain the power allocation of each sub-carrier pair,and finally it allocates the power of each sub-carrier pair to all nodes.Simulation results show that the proposed power allocation strategy can significantly improve the total system rate,and the performance is improved as the number of sub-carrier increases.
出处
《计算机科学》
CSCD
北大核心
2015年第7期142-145,169,共5页
Computer Science
基金
南京邮电大学自然科学基金项目(NY211083)资助
关键词
双向中继
正交频分复用
功率分配
子载波匹配
系统总速率
原对偶内点法
Two-way relaying
OFDM
Power allocation
Subcarrier matching
Total system rate
Primal-dual interior-point methods
