摘要
为提升多用户无线携能通信系统吞吐量,设计了一种缓存辅助的协作非正交多址接入(NOMA)携能传输方案,在平均/峰值功耗、用户速率、缓存队列稳定性等约束条件下,最大化系统平均吞吐量。为降低优化复杂度,引入Lyapunov方法,将长期平均优化问题转化为一系列时间离散的子优化问题,并提出了一种自适应传输与资源分配优化算法,能根据时变信道/缓存状态,动态优化工作模式、用户调度和功率分配。仿真结果表明,与已有方案相比,所提方案可显著提升平均吞吐量,且实现时延与吞吐量间性能的折中。
To improve the throughput of multiuser simultaneous wireless information and power transfer systems,a buffer-aided cooperative non-orthogonal multiple access scheme with power transfer was designed to maximize the average throughput under the constraints of average/peak power,user’s rate,and the buffer stability.To reduce the optimization complexity,the Lyapunov’s method was introduced to convert the long-term average optimization problem into a series of time-discrete subproblems,and an adaptive transmission and resource allocation optimization algorithm was proposed,where the working mode,the user scheduling and the power allocation were dynamically optimized according to the time-varying channel/buffer state.Simulation results demonstrate that compared with the existing schemes,the proposed scheme can significantly enhance the average throughput whilst achieving the tradeoff between the delay and throughput.
作者
杨龙
赵丽
周雨晨
贺冰涛
陈健
YANG Long;ZHAO Li;ZHOU Yuchen;HE Bingtao;CHEN Jian(School of Telecommunication Engineering,Xidian University,Xi’an 710071,China)
出处
《通信学报》
EI
CSCD
北大核心
2023年第6期77-89,共13页
Journal on Communications
基金
国家自然科学基金资助项目(No.61971320,No.62201421)
陕西省重点产业创新链基金资助项目(No.2023-ZDLGY-50)
陕西省自然科学基础研究计划基金资助项目(No.2021JQ-206)
广东省基础与应用基础研究基金资助项目(No.2020A1515110084)。
关键词
协作非正交多址接入
缓存辅助
能量收集
用户调度
cooperative non-orthogonal multiple access
buffer-aided
energy harvesting
user scheduling