A Novel Power Allocation Scheme Under Outage Constraints in NOMA Systems
A Novel Power Allocation Scheme Under Outage Constraints in NOMA Systems
复制标题
NOMA 系统停电约束下的新型功率分配方案
DOI：
10.1109/lsp.2016.2591561
复制
发表时间：
2016-09-01
影响因子：
3.9
通讯作者：
Fan, Pingzhi
中科院分区：
文献类型：
--
作者：
Cui, Jingjing;Ding, Zhiguo;Fan, Pingzhi
在这封信中，我们研究了下行链路非正交多址（NOMA）传输系统，其中发射机仅提供平均信道状态信息（CSI）。 NOMA 系统的发射功率和用户公平性方面的两个标准被用来制定两个优化问题，受到中断概率约束和最优解码顺序的影响。我们首先研究当发射机只知道平均CSI时的最优解码顺序，然后，我们利用NOMA原理的特点针对这两个问题开发封闭形式的最优功率分配方案。此外，还获得了停电约束下NOMA系统和OMA系统之间的功率差。
In this letter, we study a downlink non-orthogonal multiple access (NOMA) transmission system, where only the average channel state information (CSI) is available at the transmitter. Two criteria in terms of transmit power and user fairness for NOMA systems are used to formulate two optimization problems, subjected to outage probabilistic constraints and the optimal decoding order. We first investigate the optimal decoding order when the transmitter knows only the average CSI, and then, we develop the optimal power allocation schemes in closed form by employing the feature of the NOMA principle for the two problems. Furthermore, the power difference between NOMA systems and OMA systems under outage constraints is obtained.