arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1811.03220cs.ITmath.IT
收藏

采用中继选择策略的协作NOMA系统的安全中断分析

Secrecy Outage Analysis for Cooperative NOMA Systems with Relay Selection Scheme

Hongjiang Lei, Zixuan Yang, Ki-Hong Park, Imran Shafique Ansari, Yongcai Guo, Gaofeng Pan, Mohamed-Slim Alouini

摘要:

研究了Nakagami- $m$衰落信道下多中继辅助非正交多址接入(NOMA)网络的保密中断性能。利用两个时隙从基站向目的地发送信号。在第一个时隙,基站通过消息映射策略将两个用户的叠加信号广播给所有解码转发中继。然后,选择的中继通过功率域NOMA技术向两个用户发送叠加信号。三种中继选择(RS)方案,即,提出了最优单中继选择(OSRS)方案、两步单中继选择(TSRS)方案和最优双中继选择(ODRS)方案,并分析了保密中断性能。作为一个基准,我们还研究了保密中断性能的NOMA系统与传统的多中继合并(TMRC)计划,其中所有的中继,成功地解码信号从源转发信号到NOMA用户具有相同的功率。考虑到两个NOMA用户的保密容量之间的相关性和不同的保密要求,推导了所提出的OSRS、TSRS和ODRS方案以及TMRC方案的安全中断概率(SOP)的封闭表达式,并通过仿真进行了验证。为了得到更多的见解,我们还推导出封闭形式的表达式的渐近SOP的所有计划与固定和动态的功率分配。此外,还得到了合作NOMA系统的保密分集阶。结果表明,与TMRC方案相比,我们提出的方案可以显著提高保密性能,并且所有采用固定功率分配的RS方案都获得了零SDO,而采用动态功率分配的OSRS方案获得了与TMRC相同的SDO。

英文摘要:

This paper considers the secrecy outage performance of a multiple-relay assisted non-orthogonal multiple access (NOMA) network over Nakagami-$m$ fading channels. Two slots are utilized to transmit signals from the base station to destination. At the first slot, the base station broadcasts the superposition signal of the two users to all decode-and-forward relays by message mapping strategy. Then the selected relay transmits superposition signal to the two users via power-domain NOMA technology. Three relay selection (RS) schemes, i.e., optimal single relay selection (OSRS) scheme, two-step single relay selection (TSRS) scheme, and optimal dual relay selection (ODRS) scheme, are proposed and the secrecy outage performance are analyzed. As a benchmark, we also examine the secrecy outage performance of the NOMA systems with traditional multiple relays combining (TMRC) scheme in which all the relay that successfully decode signals from the source forward signals to the NOMA users with equal power. Considering the correlation between the secrecy capacity of two users and different secrecy requirement for two NOMA users, the closed-form expressions for the security outage probability (SOP) of the proposed OSRS, TSRS, and ODRS schemes along with the TMRC scheme are derived and validated via simulations. To get more insights, we also derive the closed-form expressions for the asymptotic SOP for all the schemes with fixed and dynamic power allocations. Furthermore, the secrecy diversity order (SDO) of cooperative NOMA systems is obtained. The results demonstrate that our proposed schemes can significantly enhance the secrecy performance compared to the TMRC scheme and that all the RS schemes with fixed power allocation obtain zero SDO and the OSRS scheme with dynamic power allocation obtains the same SDO as TMRC.

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。

↑