基于非正交多址技术的协作中继传输方案  

Transmission scheme of cooperation relay based on non-orthogonal multiple access

作　　者：颜晓娟 肖海林[1,3] 王茹[1] 黄国庆 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]钦州学院工程训练中心,广西钦州535011 [3]温州大学物理与电子信息工程学院,浙江温州325035

出　　处：《系统工程与电子技术》2017年第10期2333-2338,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61261018;61472094);广西自然科学基金杰出青年基金(2014GXNSFGA118007);东南大学国家移动通信研究实验室开放基金(2015D05);桂林电子科技大学研究生教育创新计划资助项目(2016YJCXB05)资助课题

摘　　要：针对星地频谱共享网络中深衰落认知用户传输速率低的问题,提出了一种基于非正交多址接入(non-orthogonal multiple access,NOMA)的协作中继传输方案。该方案的源节点采用NOMA技术广播信息并根据信道特性自适应地调节功率分配因子,中继节点通过中继-源节点功率比参数合理设置其传输功率并进行译码转发,在功率受限情况下最大化认知用户的传输速率。数值分析结果表明,功率比在一定范围内时,与正交多址接入的协作中继方案相比,该方案的传输速率提高了13.7%左右;当两种方案传输速率相同时,该方案的功率节约30%左右。To improve the transmission rate of deep fading cognitive users in spectrum sharing satellite terrestrial network, a relay cooperative communication strategy with non-orthogonal multiple access （NOMA） is presented. For the proposed strategy, on one hand, the source node can utilize NOMA technology to broadcast information, and adaptively adjust the power allocation factor according to the channel characteristics. On the other hand, the transmission power of relay node with decode-and-forward is reasonably set by the relay-source power ratio parameter. In the case, the proposed strategy can maximize the transmission rate of the cognitive user under the total power constraint. Numerical results show that, compared with the relay cooperative communication strategy with orthogonal multiple access, the transmission rate of the proposed strategy will improve by about 13.7% within a certain limit of the relay-source power ratio. Moreover, the total power of the proposed strategy will reduce by about 30% in the same transmission rate.

关 键 词：频谱共享 星地网络 非正交多址接入 协作中继 

分 类 号：TN929.5[电子电信—通信与信息系统]