Analyzing Hybrid NOMA Schemes Underlining Energy-Spectral Efficiency and SIC Tradeoff

Majumder Haider, Anindya Bal, Mousumi Sur, N. Chowdhury, Arshad Chowdhury
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引用次数: 2

Abstract

To cope with soaring users demand an appropriate multiple access technique becomes crucial in 5G and beyond wire-less communications. Non-orthogonal multiple access (NOMA) technique is superior to the existing orthogonal multiple access (OMA) technique utilizing the limited resources, though NOMA grants manageable interferences by non-orthogonal resource allocation. Successive Interference Cancellation (SIC) can efficiently mitigate the impact of interference when implemented massively, but it raises computational complexity significantly, hence, reduces energy efficiency. This paper focuses on comparative performance analysis among hybrid NOMA schemes such as MIMO-NOMA, NOMA-GSSK and STBC-CNOMA in terms of bit error probability, energy and spectral efficiency and number of SIC occurrence. The closed form expression to compute channel capacity for STBC-CNOMA scheme has been derived and less complex expression to calculate bit error probability for NOMA-GSSK scheme has been suggested. Numerical analysis and simulation results validate the superiority of the NOMA-GSSK scheme in terms of bit error probability and spectral efficiency than the other two promising schemes. The findings also demonstrate that STBC-CNOMA certainly outweighs the other two schemes considering system complexity and energy efficiency.
基于能谱效率和SIC权衡的混合NOMA方案分析
为了应对不断增长的用户需求,在5G和无线通信之外,适当的多址技术变得至关重要。非正交多址(NOMA)技术利用有限的资源,优于现有的正交多址(OMA)技术,尽管NOMA通过非正交资源分配提供可管理的干扰。连续干扰抵消(SIC)在大规模实现时可以有效地减轻干扰的影响,但它大大增加了计算复杂度,从而降低了能源效率。本文重点对MIMO-NOMA、NOMA- gssk和stbc - coma三种混合NOMA方案在误码率、能量频谱效率和SIC出现次数等方面的性能进行了比较分析。推导了STBC-CNOMA方案信道容量计算的封闭表达式,提出了计算NOMA-GSSK方案误码概率的较简单表达式。数值分析和仿真结果验证了NOMA-GSSK方案在误码率和频谱效率方面优于其他两种方案。研究结果还表明,考虑到系统复杂性和能源效率,stbc - coma方案肯定优于其他两种方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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