BOOSTING THE SUM RATE INA THREE USER NOMA NETWORK USING INSPIRED CR-NOMA POWER ALLOCATION

Publication Date : 15/06/2023


Author(s) :

Lawal Muhammad Bello, Abdullahi Musa Auyo, Suleiman Aliyu Babale.


Volume/Issue :
Volume 18
,
Issue 2
(06 - 2023)



Abstract :

Fifth generation (5G) network which utilizes non-orthogonal multiple access (NOMA) to achieve some of its data requirement and maintain its advantages of low latency, high throughput and spectral efficiency which needs to be maximized to accommodate more users and enhance network capacity. This research proposes Rayleigh fading approach and inspired cognitive radio (CR-NOMA) power allocation to boost the sum rate in a three-user single carrier (SC-NOMA) system. The adopted model allocates power based on users’ channels condition while guaranteeing the minimum power required by the weakest user. This leads to simulations that involve three users with different channel conditions where their total sum rate is calculated and compared with the sum rate achieved when conventional fixed (F-NOMA) power allocation is used. The results revealed that simulation with three users arranged in two different forms between two user NOMA system coupled with lone unpaired user communicated using orthogonal multiple access (OMA) and three user SC-NOMA where both uses F-NOMA power allocation yields the maximum sum rate of 1.8 x 10-4bps/Hz and 0.3 x 10¬¬¬-4bps/Hz respectively. While inspired CR-NOMA power allocation yields a maximum sum rate of 16 bps/Hz for SC-NOMA and 7.5 bps/Hz for typical NOMA-OMA arrangement. The result shows a significant improvement over the existing system. Furthermore, it was observed that high sum rate in SC-NOMA is due to users’ distinct channel conditions while that of typical NOMA-OMA is due to large sum rate achieved by the lone unpaired user utilizing single spectrum. This makes room for more users to be accommodated without fear of signal degradation.


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