On Power Allocation and User Grouping for Sparse Coded Non-Orthogonal Multiple Access in the Downlink

Johannes Dommel, S. Faehse, L. Thiele
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引用次数: 1

Abstract

Sparse-spreading based non-orthogonal multiple access is considered to be a key component to support massive connectivity and increased capacity for future wireless communication systems. Since multiple users are co-scheduled on the same physical resources, power allocation cannot be optimized independently per user but also has to consider the assignment of resources between different users. This accounts specifically in the downlink, where the sum power constraint holds. In this paper, we propose a heuristic approach for power allocation in a downlink system using multi-user sparse coded multiple access. The motivation is to improve fairness within a group of users sharing the same physical resources in a non-orthogonal fashion and thus, simplify the receiver processing. An extensive simulation study reveals, that aligning the signal-to-noise ratio of each user within the group, user fairness can be improved without loosing system performance as long as the users are grouped carefully.
稀疏编码非正交多址下行链路功率分配与用户分组研究
基于稀疏传播的非正交多址被认为是支持未来无线通信系统大规模连接和增加容量的关键组件。由于多个用户在同一物理资源上共同调度,所以不能针对每个用户单独优化电力分配,还必须考虑不同用户之间的资源分配。这尤其适用于下行链路,在下行链路中,和功率约束是有效的。本文提出了一种启发式的多用户稀疏编码多址下行系统功率分配方法。其动机是提高以非正交方式共享相同物理资源的用户组内的公平性,从而简化接收器处理。一项广泛的仿真研究表明,只要仔细地对用户进行分组,调整组内每个用户的信噪比,就可以在不损失系统性能的情况下提高用户公平性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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