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:: Volume 6, Issue 1 (1-2020) ::
2020, 6(1): 34-53 Back to browse issues page
Performance Evaluation of the NOMA in Imperfect SIC Mode and Ergodic Capacity Maximization with User Pairing Scenario in Three Users Groups
Behzad Mozaffary tazekand , Farid Tabee miandoab *
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz , fariiiid95@ms.tabrizu.ac.ir
Abstract:   (10056 Views)

This paper evaluates the problem of user pairing scenario with similar channel conditions in NOMA with three users per pair. The small difference in the channel gain of the paired users leads to interference in the process of successive interference cancelation (SIC). The incidence of imperfect SIC reduces system capacity. Also, mid users in this scenario will be deprived of the advantages provided by the NOMA without pairing, on the other hand, by pairing,  due to the closeness of the users’ channel conditions to each other, leads to the incidence of imperfect SIC. In this paper, in order to solve this problem, we propose a scenario for users to pair, in which all users, including mid users, will be able to use the benefits of NOMA and the problem of incidence of imperfect SIC is minimized. To evaluate the performance of the NOMA, we examine the sum ergodic capacity in both perfect and imperfect SIC modes. In this paper, the concept of an imperfect SIC has calculated analytically for the first time for pairs containing three users. The calculations performed along with the simulations show that in this case, the system's capacity falls sharply. The simulation results also show that the proposed scenario, in addition to minimizing the imperfect SIC event, provides a higher sum ergodic capacity than other scenarios.

Keywords: NOMA (non-orthogonal multiple access), user pairing, perfect SIC (successive interference cancelation), imperfect SIC (successive interference cancelation), sum ergodic capacity.
Full-Text [PDF 1208 kb]   (2986 Downloads)    
Type of Study: Research | Subject: Wireless Networks
Received: 2018/05/2 | Accepted: 2019/04/16 | Published: 2020/01/22
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mozaffary tazekand B, tabee miandoab F. Performance Evaluation of the NOMA in Imperfect SIC Mode and Ergodic Capacity Maximization with User Pairing Scenario in Three Users Groups. Nonlinear Systems in Electrical Engineering 2020; 6 (1) :34-53
URL: http://journals.sut.ac.ir/jnsee/article-1-188-en.html


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Volume 6, Issue 1 (1-2020) Back to browse issues page
سامانه های غیرخطی در مهندسی برق Journal of Nonlinear Systems in Electrical Engineering
نشریه سامانه‌های غیرخطی در مهندسی برق در خصوص اصول اخلاقی انتشار مقاله، از توصیه‌های «کمیته بین‌المللی اخلاق نشر» موسوم به COPE و «منشور و موازین اخلاق پژوهش» مصوب معاونت پژوهش و فناوری وزارت علوم، تحقیقات و فناوری تبعیت می‌کند.
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