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arXiv 2308.08804cs.ITeess.SPmath.IT
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实际SIC误差下下行不可信NOMA的保密中断概率分析

Secrecy Outage Probability Analysis for Downlink Untrusted NOMA Under Practical SIC Error

Sapna Thapar, Deepak Mishra, Derrick Wing Kwan Ng, Ravikant Saini

AI总结:

针对接收端不完美SIC导致残余干扰且用户不可信的下行NOMA系统,提出RI模型并推导两用户SOP解析表达式及高信噪比近似,数值验证了理论结果。

摘要:

非正交多址接入(NOMA)通过在发射端利用叠加编码并在接收端采用连续干扰消除(SIC),在同一资源块上同时为多个用户提供服务。在实际考虑下,可能无法实现完美SIC。因此,由于不完美SIC,残余干扰(RI)不可避免地产生。在本工作中,我们首先提出一种用于表征RI的新模型,以便在接收端存在不完美SIC的情况下,为下行NOMA系统提供更贴近实际的保密性能分析。在存在不可信用户时,NOMA具有固有的安全缺陷。因此,针对这一不可信用户场景,我们利用所提出的RI模型,为两用户不可信NOMA系统中的每个用户推导了保密中断概率(SOP)的新解析表达式。为进一步阐明所得结果并获得更深入的理解,还得到了SOP在高信噪比下的近似。最后,本文给出数值研究,以验证所需解析结果的准确性,并就各类系统参数对安全NOMA通信系统保密速率性能的影响提出有价值的见解。

英文摘要:

Non-orthogonal multiple access (NOMA) serves multiple users simultaneously via the same resource block by exploiting superposition coding at the transmitter and successive interference cancellation (SIC) at the receivers. Under practical considerations, perfect SIC may not be achieved. Thus, residual interference (RI) occurs inevitably due to imperfect SIC. In this work, we first propose a novel model for characterizing RI to provide a more realistic secrecy performance analysis of a downlink NOMA system under imperfect SIC at receivers. In the presence of untrusted users, NOMA has an inherent security flaw. Therefore, for this untrusted users' scenario, we derive new analytical expressions of secrecy outage probability (SOP) for each user in a two-user untrusted NOMA system by using the proposed RI model. To further shed light on the obtained results and obtain a deeper understanding, a high signal-to-noise ratio approximation of the SOPs is also obtained. Lastly, numerical investigations are provided to validate the accuracy of the desired analytical results and present valuable insights into the impact of various system parameters on the secrecy rate performance of the secure NOMA communication system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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