实际损伤存在下人工噪声辅助双跳SWIPT MIMO-NOMA网络的保密性能

中文摘要 AI 辅助

本文研究了实际损伤下协作非正交多址接入（NOMA）网络的保密性能。在所考虑的系统中，源端采用正交空时分组编码（OSTBC）传输，合法用户采用接收天线选择（RAS），窃听者采用最大比合并（MRC）方案。此外，一个能量受限的放大转发中继从接收信号中收集能量，并将收集到的能量分配给信息转发和人工噪声（AN）生成。为了捕捉更实际传输场景的真实性能，考虑了信道估计误差（CEE）、反馈延迟（FBD）、不完美串行干扰消除（SIC）和不完美人工噪声消除。针对该系统，推导了合法用户信干噪比（SINR）累积分布函数（CDF）和窃听者SINR概率密度函数（PDF）的闭式表达式，并获得了易于处理的解析保密中断概率（SOP）表达式。此外，在理想信道状态信息（CSI）条件和实际损伤下表征了高信噪比保密行为，分别揭示了可实现的保密分集阶数和保密中断底限。同时，基于所获得的SOP结果分析了保密吞吐量和能量效率。数值结果与分析结果高度吻合，并进一步说明了所提出系统的保密行为如何受关键设计参数和实际损伤的影响。所得结果表明，发射和接收分集以及适当的人工噪声功率分配显著提高了保密性能，而实际损伤导致高信噪比区域出现非零SOP底限。

英文摘要

This paper investigates the secrecy performance of a cooperative non-orthogonal multiple access (NOMA) network under practical impairments. In the considered system, the source employs orthogonal space-time block coding (OSTBC) transmission, legitimate users adopt receive antenna selection (RAS), and the eavesdropper utilizes maximal-ratio combining (MRC) scheme. Moreover, an energy-constrained amplify-and-forward relay harvests energy from the received signal and allocates the harvested energy to information forwarding and artificial noise (AN) generation. To capture the realistic performance of a more practical transmission scenario, channel estimation errors (CEE), feedback delay (FBD), imperfect successive interference cancellation (SIC), and imperfect AN cancellation are taken into account. For this system, closed-form expressions for the legitimate-user signal-to-interference+noise ratios (SINR) cumulative distribution function (CDF) and the eavesdropper SINR probability density function (PDF) are derived, and a tractable analytical secrecy outage probability (SOP) expressions are obtained. In addition, the high-SNR secrecy behavior is characterized under ideal channel state information (CSI) conditions and practical impairments, revealing the achievable secrecy diversity order and the secrecy outage floor, respectively. Moreover, secrecy throughput and energy efficiency are analyzed based on the obtained SOP results. The numerical findings are in close agreement with the analytical results and further illustrate how the secrecy behavior of the proposed system is affected by key design parameters and practical impairments. The obtained results indicate that transmit and receive diversity and proper AN power allocation significantly improve the secrecy performance, whereas practical impairments lead to non-zero SOP floors in the high signal-to-noise ratio region.

发表机构

• Gebze Technical University（盖布泽理工大学）
• Polytechnique Montréal（蒙特利尔高等工程学院）

机构由 AI 辅助整理，请以论文原文为准。