能量收集认知网络中基于次用户意愿和吞吐量的中继协作方案  

Optimal relay scheme for cooperation and throughput requirements of secondary users in energy harvesting cognitive networks

作　　者：谢显中[1] 罗莹 陈九九[1] 严可 XIE Xianzhong;LUO Ying;CHEN Jiujiu;YAN Ke(Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, P.R. China)

机构地区：[1]重庆邮电大学个人通信研究所,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2019年第1期1-10,共10页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61271259;61601070);重庆市教委科学技术研究项目(KJ1600411);重庆市教委重点实验室专项经费(KJ12010000062);重庆市基础与前沿研究计划项目(CSTC2016jcyjA0455);长江学者和创新团队发展计划(IRT1299)~~

摘　　要：针对能量收集认知无线电网络(energy harvesting-cognitive radio network,EH-CRN)很少考虑次用户需求,且缺乏主次用户间的具体协作策略的问题,提出一种基于次用户意愿的中继协作方案。与传统协作方案不同的是,该方案考虑次用户意愿,假设次用户可以根据自身需求选择携带数据量负荷较小的主用户进行合作,并给出了具体的协作策略。设计了一种能量收集时间分配因子的优化方案,使得在合作以及非合作模式下次用户吞吐量最大。进一步,在不合作模式下推导出能量收集时间分配因子的闭式解;在合作模式下,由于无法直接完全通过解析求解获得优化结果,故采用遍历搜索的方法求解优化问题。进行了仿真分析,一方面验证了该方案的系统性能比传统合作方案有明显优势,另一方面仿真了不同参数对该方案性能的影响。Energy harvesting cognitive radio networks is a research hotspot at present, but it seldom considers the demands of secondary users, and lacks specific cooperative schemes between primary users (PU) and secondary users (SU). So, in this paper, we propose a relay cooperative scheme based on SU’s willingness. Unlike the traditional cooperative schemes, we consider the SU’s willingness and assume that SU can select PU with less traffic load to cooperate with, and specific cooperative strategy is proposed. In this scheme, we firstly design an optimizing scheme of energy harvesting time sharing factor to maximize the SU’s throughput in cooperation mode and non-cooperation mode. Moreover, we derive the closed-form solution of energy harvesting time sharing factor in non-cooperation mode. Meanwhile, in cooperation mode, the optimal result can not be obtained directly through analytical algorithm, so the optimizing problem is solved through ergodic searching solution. Finally, we conduct the simulation analysis, on the one hand, the results indicate that the proposed scheme has better performance compared with existing cooperative schemes;on the other hand, we simulate the impact that different parameters have on the performance of proposed scheme.

关 键 词：认知无线电 能量收集 次用户意愿 中继协作 吞吐量最大 

分 类 号：TN929.5[电子电信—通信与信息系统]