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http://dx.doi.org/10.7236/JIIBC.2021.21.4.37

Outage Performance of Uplink NOMA Systems with CDF Scheduling  

Kim, Nam-Soo (Dept. of Electronic Engineering, Cheongju University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.21, no.4, 2021 , pp. 37-42 More about this Journal
Abstract
NOMA (Non-orthogonal multiple Access) system has been focused on the next generation cellular system for higher spectral efficiency. However, this requires user scheduling as the NOMA system is a multi-user system which accesses simultaneously. There are two representative scheduling schemes, proportionate scheduling (FP) and cumulative distribution function (CFD) scheduling. The PF scheduling is applied, the cell edge user is hard to obtain a transmit opportunity. Recently, CDF scheduling is obviously noted that it offers the same possibility of transmission for a user regardless of the location in a cell. We consider an uplink NOMA system with CDF scheduling, and obtain the channel access probabilities, the outage probabilities of the system with different number of users and different kinds of weights through simulation. The results indicate that the likelihood of each user accessing the channel is the same and the probability of failure decreases as the number of users increases. We found that the effect of the probability of failure is negligible as the weight of the cell edge user increases.
Keywords
CDF Scheduling; NOMA performance; Rayleigh fading; Selection probability;
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