On the Capacity Comparison Between MIMO-NOMA and MIMO-OMA
On the Capacity Comparison Between MIMO-NOMA and MIMO-OMA
复制标题
MIMO-NOMA与MIMO-OMA容量比较
DOI：
10.1109/access.2016.2563462
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发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Song, Mei
中科院分区：
文献类型：
--
作者：
Liu, Yang;Pan, Gaofeng;Song, Mei
非正交多址接入（NOMA）在总信道容量方面已经在文献中被证明具有比OMA更好的性能;然而，NOMA相对于OMA的容量优势仅在单天线系统中被证明，而多输入多输出NOMA（MIMO-NOMA）相对于常规MIMO-OMA的容量优势尚未得到证明。在本文中，我们将提供证据来证明MIMO-NOMA在总信道容量方面严格优于MIMO-OMA（仅与一个用户通信的情况除外），即，对于MIMO-OMA实现的任何速率对，存在功率分割，对于该功率分割，MIMO-NOMA可以实现严格更大的速率对。基于这个结果，我们证明了MIMO-NOMA也可以实现更大的遍历容量和MIMO-OMA。我们的分析结果进行了验证模拟。
Non-orthogonal multiple access (NOMA) has been shown in the literature to have a better performance than OMA in terms of sum channel capacity; however, the capacity superiority of NOMA over OMA has been only proved for single antenna systems, and the proof for the capacity superiority of multiple-input multiple-output NOMA (MIMO-NOMA) over conventional MIMO-OMA has not been available yet. In this paper, we will provide our proof to demonstrate that the MIMO-NOMA is strictly better than MIMO-OMA in terms of sum channel capacity (except for the case where only one user is being communicated to), i.e., for any rate pair achieved by MIMO-OMA, there is a power split for which MIMO-NOMA can achieve rate pairs that are strictly larger. Based on this result, we prove that the MIMO-NOMA can also achieve a larger sum ergodic capacity than MIMO-OMA. Our analytical results are verified by simulations.