Energy-Efficient Power Allocation in Multi-User mmWave-NOMA Systems With Finite Resolution Analog Precoding

This paper investigates the energy-efficient power allocation strategy for multi-user mmWave non-orthogonal multiple access (NOMA) system with different hybrid precoding (HP) structures. Particularly, we consider the fully-access HP structure and the subarray HP structure, respectively. For these tw...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology Vol. 71; no. 4; pp. 3750 - 3759
Main Authors: Qi, Xiaolei, Xie, Gang, Liu, Yuanan
Format: Journal Article
Language:English
Published: New York IEEE 01.04.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Downlink
Energy efficiency
hybrid precoding
Hybrid systems
Inverters
Millimeter waves
mmWave communications
NOMA
Nonorthogonal multiple access
Optimization
power allocation
Precoding
Radio frequency
Resource management
Switches
user clustering
ISSN:0018-9545, 1939-9359
Online Access:Get full text
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Summary:This paper investigates the energy-efficient power allocation strategy for multi-user mmWave non-orthogonal multiple access (NOMA) system with different hybrid precoding (HP) structures. Particularly, we consider the fully-access HP structure and the subarray HP structure, respectively. For these two structures, the finite resolution analog precoder is realized through a low-power switches and inverters (SI) network. In the NOMA system, multiple users are first paired according to their channel correlation and gain difference. Following this, we propose hybrid precoding schemes for the low-power SI-based HP structures. Then, a power allocation (PA) problem is formulated to maximize the energy efficiency of the system, subject to per-cluster' power constraints and per-user' quality of service constraints. To solve the non-convex PA optimization problem, we devise a suboptimal solution with two-stage PA strategies. Furthermore, the PA problem aiming at conditionally maximizing the spectrum efficiency is also analyzed. Simulation results show that the proposed mmWave-NOMA can achieve higher energy efficiency than the existing mmWave-NOMA scheme and the conventional mmWave orthogonal multiple access scheme.
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2021.3080387