Paper Info
Title
Low-Resolution Limited-Feedback NOMA for mmWave Communications
Abstract
The spectrum-efficient millimeter-wave (mmWave) communications has recently attracted much attention as a viable solution to spectrum crunch problem. In this work, we propose a novel non-orthogonal multiple access (NOMA) framework, which makes use of the directional propagation characteristics of mmWave communications so as to improve the spectral efficiency through non-orthogonal signaling. In particular, we consider one-bit quantized angle information as a limited yet effective feedback scheme describing the channel quality of user equipment (UE) in mmWave bands. The UE pairs for NOMA transmission are then established using not only the one-bit distance feedback as a classical approach, but also the one-bit angle feedback. The proposed strategy is therefore referred to as two-bit NOMA. We also propose a novel hybrid strategy, called combined NOMA, for the circumstances with no UE pair through two-bit NOMA. Whenever no UE pair is available through any NOMA strategy, we resort to single user transmission (SUT) with proper UE selection schemes. The hybrid outage sum-rate performance is also analyzed thoroughly with the respective outage and rate expressions. The numerical results verify that the proposed strategy outperforms one-bit NOMA schemes with either angle- or distance-only feedback, and has a very close outage sum-rate performance to that for the optimal full-resolution feedback.
Year
DOI
Venue
2020
10.1109/TWC.2020.2993212
IEEE Transactions on Wireless Communications
Keywords
DocType
Volume
Low-resolution limited-feedback,millimeter-wave (mmWave) communications,multiuser communications,non-orthogonal multiple access (NOMA)
Journal
19
Issue
ISSN
Citations 
8
1536-1276
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Yavuz Yapici13710.10
Ismail Güvenç22041153.03
Huaiyu Dai31790173.26