不完美CSI下全双工多用户多天线中继网络的能效谱效均衡  

Trade-off between Energy Efficiency and Spectrum Efficiency for Full-Duplex Multi-User Multi-Antenna Relay Networks under Imperfect CSI

作　　者：仇润鹤 张茜[2] QIU Runhe;ZHANG Qian(College of Information Sciences and Technology,Shanda University,Shanghai 201209,China;College of Information Sciences and Technology,Donghua University,Shanghai 201620,China)

机构地区：[1]上海杉达学院信息科学与技术学院,上海201209 [2]东华大学信息科学与技术学院,上海201620

出　　处：《通信技术》2024年第10期1023-1029,共7页Communications Technology

基　　金：教育部产学合作协同育人项目(230805384035416)。

摘　　要：在信道状态信息存在误差及用户间存在相互干扰的条件下,为优化解码转发全双工多用户多天线中继网络的能量效率和频谱效率性能,提出一种能效与谱效均衡优化方案,通过寻求能效和谱效之间的平衡点,实现能效和谱效的最优化。首先,对信道进行估计,求出最小均方误差下信道估计和下行速率的表达式;其次,在最大总发射功率的约束下,引入帕累托最优集,建立多目标优化问题,使相互矛盾的能效和谱效同时最大化;再次,利用加权和的方法,将多目标能效和谱效优化问题简化为单目标能效与谱效优化问题,通过增加干扰约束将单目标优化问题转化为凸优化问题,并采用拉格朗日乘子法求得最优发射功率;最后,通过仿真结果证明,设置不同的均衡因子能够实现能效和谱效的均衡。In order to optimize the energy efficiency and spectrum efficiency performance of decode-andforward full-duplex multi-user multi-antenna relay networks under the conditions of error in channel state information and mutual interference among users,an energy efficiency and spectrum efficiency balancing optimization scheme is proposed which achieves the optimization of energy efficiency and spectrum efficiency by seeking the balance point between them.First,the channel estimation is performed,and the expressions of channel estimation and downlink rate under minimum mean square error are obtained.Then,under the constraint of the maximum total transmit power,the Pareto optimal set is introduced to build a multi-objective optimization problem to maximize the conflicting energy efficiency and spectrum efficiency simultaneously.Next,the multi-objective energy efficiency and spectrum efficiency optimization problem is simplified into a single-objective energy efficiency and spectrum efficiency optimization problem by using the weighted sum,the single-objective optimization problem is transformed into a convex optimization problem by adding interference constraints,and the optimal transmit power is achieved by using Lagrange multiplier method.Finally,simulation results indicate that setting different balancing factors can achieve the trade-off between energy efficiency and spectrum efficiency.

关 键 词：解码转发 全双工 中继网络 能量效率 频谱效率 

分 类 号：TN925[电子电信—通信与信息系统]