Open AccessSpace‐frequency signal alignment for optimal DoF in multi‐carrier MIMO‐NOMA systems
Author(s) -
Liu Weihua,
Ding Hanqing,
Xu Jin,
Zhang Zhe
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.2606
Subject(s) - mimo , telecommunications link , interference (communication) , computer science , noma , electronic engineering , diagonal , control theory (sociology) , channel (broadcasting) , algorithm , mathematics , telecommunications , engineering , geometry , control (management) , artificial intelligence
In the process of maximising the utilisation of spatial and radio resources, interference is the major factor limiting the system capacity. In this Letter, a novel multi‐carrier signal alignment (MCSA) scheme based on diagonal‐block channel matrix is first proposed, to mitigate the interference in downlink multi‐input multi‐output non‐orthogonal multiple access (MIMO‐NOMA) cellular networks. The maximum degree of freedom (DoF) can be achieved by the iterative design of MCSA. Simulation results show the effectiveness and superiority of the proposed MCSA scheme in improving the sum‐rate and DoF, by fully using multiple antennas and multiple carriers.