Original scientific paper
https://doi.org/10.1080/00051144.2024.2314937
Subcarrier-users nomination process for downlink NOMA system
G. Shanmugavel
; Department of Electronics and Communication Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, India
*
M. S. Vasanthi
; Department of Electronics and Communication Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu, India
* Corresponding author.
Abstract
The non-orthogonal multiple access (NOMA) characteristics of 5G radio access allowfor more efficient resource distribution. NOMA improves spectral efficiency by allowing Power domain users
to transmit power concurrently with other users of time and spectrum resources. The selection of
the subcarrier and the nomination of users to the subcarrier is of the utmost importance to maximize spectral efficiency fairness among the users and improve the data rate of weak users in the
downlink NOMA system. The least gain subcarrier First-threshold-based Adaptive user grouping
algorithm (LGSF-TBAUGA) has been devised for this purpose. This algorithm maintains a significant channel gain differential based on a threshold, thus avoiding successive interference
cancellation (SIC) process imperfections. The computational complexity of the proposed technique is calculated and compared to other approaches. The power coefficients of the selected
users are used to allocate power to them. The proposed method improves the weak user data
and overall system sum rates. As a result, the spectrum efficiency and user fairness index have
been greatly enhanced compared to some existing algorithms.
Keywords
Subcarrier selection; user grouping; NOMA; computational complexity; spectral efficiency; fairness index
Hrčak ID:
323054
URI
Publication date:
13.2.2024.
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