摘要
为了进一步提高多波束卫星系统的频谱效率,满足多接入的需求,提出一种基于下行非正交多址的稳健波束成形与功率分配方法。在已知非完美信道状态信息条件下,首先,建立满足NOMA用户服务质量和地球站干噪比阈值的概率约束的功率最小化问题;然后,针对此非凸问题,采用伯恩斯坦不等式将概率约束转换成确定形式,并将原问题分解为波束成形和功率分配两个子问题,通过交替迭代完成稳健设计。仿真结果表明,与其他现有方案相比,所提方案具有更好的稳健性和有效性。
To improved the spectrum efficiency of multibeam satellite system and meet the requirement of multi-access,a robust beamforming and power allocation scheme based on non-orthogonal multiple access(NOMA)was proposed.Under the condition that the imperfect channel state information was known,fi rstly,a power minimization problem subject to probability constraints of users’quality of service requirement and earth stations’interference-to-noise ratio was formulated.In order to address the non-convex problem,we then adopted Bernstein inequality to converted the probability constraints into deterministic forms and decomposed the original problem into beamforming sub-problem and power allocation sub-problem,and the robust design was conducted by alternating optimization.Simulation results showed that the proposed scheme has better robustness and eff ectiveness compared with other existing schemes.
作者
阚鹏程
王子宁
孔槐聪
欧阳键
林敏
KAN Pengcheng;WANG Zining;KONG Huaicong;OUYANG Jian;LIN Min(School of Communication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《天地一体化信息网络》
2021年第4期53-59,共7页
Space-Integrated-Ground Information Networks
关键词
多波束卫星系统
非正交多址接入
概率约束
功率分配
波束成形
multibeam satellite system
non-orthogonal multiple access
probability constraint
power allocation
beamforming
