On the Achievable Spectral Efficiency of Spatial Modulation Aided Downlink Non-Orthogonal Multiple Access

被引：35
|
作者：
Wang, Xuesi [1 ]
Wang, Jintao [1 ]
He, Longzhuang [1 ]
Tang, Zihan [1 ]
Song, Jian [1 ]
机构：
[1] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2017年 / 21卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Non-orthogonal multiple access (NOMA); spatial modulation (SM); spectral efficiency (SE); mutual information (MI); lower bound;
D O I：
10.1109/LCOMM.2017.2707068
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
In this letter, a novel spatial modulation aided non-orthogonal multiple access (SM-NOMA) system is proposed. We use mutual information (MI) to characterize the achievable spectral efficiency (SE) of the proposed SM-NOMA system. Due to the finite-alphabet space-domain inputs employed by SM, the expression of the corresponding MI lacks a closed-form formulation. Hence, a lower bound is proposed to quantify the MI of the SM-NOMA system. Furthermore, its asymptotic property is also theoretically investigated in both low and high signal-tonoise ratio regions. The SE performance and its analysis of our proposed SM-NOMA system are confirmed by simulation results.
引用
收藏
页码：1937 / 1940
页数：4
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