Terahertz-Band MIMO-NOMA: Adaptive Superposition Coding and Subspace Detection

The problem of efficient ultra-massive multiple-input multiple-output (UM-MIMO) data detection in terahertz (THz)-band non-orthogonal multiple access (NOMA) systems is considered. We argue that the most common THz NOMA configuration is power-domain superposition coding over quasi-optical doubly-mass...

Full description

Saved in:
Bibliographic Details
Published in:IEEE open journal of the Communications Society 2021, Vol.2, p.2628-2644
Main Authors: Sarieddeen, Hadi, Abdallah, Asmaa, Mansour, Mohammad M., Alouini, Mohamed-Slim, Al-Naffouri, Tareq Y.
Format: Article
Language:English
Subjects:
Array signal processing
Baseband
Bit error rate
channel puncturing
Coding
Complexity
Detectors
MIMO communication
NOMA
Nonorthogonal multiple access
Piercing
Resource management
Sensors
Silicon carbide
subspace detectors
Terahertz frequencies
THz communications
Tuning
UM-MIMO
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The problem of efficient ultra-massive multiple-input multiple-output (UM-MIMO) data detection in terahertz (THz)-band non-orthogonal multiple access (NOMA) systems is considered. We argue that the most common THz NOMA configuration is power-domain superposition coding over quasi-optical doubly-massive MIMO channels. We propose spatial tuning techniques that modify antenna subarray arrangements to enhance channel conditions. Towards recovering the superposed data at the receiver side, we propose a family of data detectors based on low-complexity channel matrix puncturing, in which higher-order detectors are dynamically formed from lower-order component detectors. The proposed solutions are first detailed for the case of superposition coding of multiple streams in point-to-point THz MIMO links. Then, the study is extended to multi-user NOMA, in which randomly distributed users get grouped into narrow cell sectors and are allocated different power levels depending on their proximity to the base station. Successive interference cancelation is shown to be carried with minimal performance and complexity costs under spatial tuning. Approximate bit error rate (BER) equations are derived, and an architectural design is proposed to illustrate complexity reductions. Under typical THz conditions, channel puncturing introduces more than an order of magnitude reduction in BER at high signal-to-noise ratios while reducing complexity by approximately 90%.
ISSN:2644-125X
2644-125X
DOI:10.1109/OJCOMS.2021.3131769