基于WIPT的两路中继协作underlay认知无线电的性能分析  

Performance analysis of two-way relay cooperation underlay cognitive radio networks based on WIPT

作　　者：徐纪胜 曾凡仔 李康 李勇峰[2] XU Jisheng;ZENG Fanzi;LI Kang;LI Yongfeng(College of Information Science and Engineering,Hunan University,Changsha 810012,China;School of Engineering,Tibet University,Lhasa 850000,China)

机构地区：[1]湖南大学信息科学与工程学院,湖南长沙810012 [2]西藏大学工学院,西藏拉萨850000

出　　处：《通信学报》2019年第2期129-136,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61370096;No.61772184);西藏自治区自然科学基金资助项目(No.2016ZR-TU-02);西藏大学青年科研培育基金资助项目(No.ZDPJZK1606);西藏大学珠峰学者人才支持计划--杰出青年基金资助项目(No.[2016]141))~~

摘　　要：首先提出基于WIPT的两路中继协作underlay认知无线电网络,其中次用户系统采用两路协作中继传输,中继采取功率分裂协议进行能量采集和信息解码,利用所采集的能量转发信息。然后通过数学推导得出系统用户的中断概率精确表达式和次用户系统遍历容量以及能量效应。最后数值仿真探讨了次用户发射功率对系统性能的影响,结果表明两路中继协作有效地降低了数据传输的中断概率,且当功率分配系数取0.5时,系统的容量和能量效应达到最优。The two-way relay cooperation for underlay cognitive radio networks based on WIPT was presented,where secondary system adopted the two-way relay cooperative transmission.First,the relay adopted a power splitting protocol to harvest energy and to decode information transmitted by secondary users,then the relay forwarded information to two secondary users by using the harvested energy.Subsequently the exact expression of the outage probability,the ergodic capacity and energy efficiency of the secondary user system were derived.Finally,numerical simulation discusses the impact on the system performance with regard to secondary transmission power.The results reveal that the two-way relay cooperation effectively reduces the outage probability of data transmission.The capacity and energy efficiency of the system reaches optimal level when the power allocation coefficient is 0.5.

关 键 词：认知无线电网络 两路中继 协作通信 无线信息和功率转发 中断概率 

分 类 号：TN925[电子电信—通信与信息系统]