基于短包通信的NOMA下行链路安全传输

doi:10.11959/j.issn.1000-436x.2021041

通信学报 ›› 2021, Vol. 42 ›› Issue (2): 168-176.doi: 10.11959/j.issn.1000-436x.2021041

基于短包通信的NOMA下行链路安全传输

孙钢灿¹^,²^,³, 赵少柯¹^,², 郝万明²^,³, 朱政宇²^,³

¹ 郑州大学河南先进技术研究院，河南郑州 450003
² 郑州大学产业技术研究院，河南郑州 450001
³ 郑州大学信息工程学院，河南郑州 450001

修回日期:2020-09-25 出版日期:2021-02-25 发布日期:2021-02-01
作者简介:孙钢灿（1977- ），男，河南濮阳人，博士，郑州大学教授，主要研究方向为通信信号处理、通信信号关键参数盲估计、调制方式识别、机器人和智慧物流等。
赵少柯（1996- ），男，河南周口人，郑州大学硕士生，主要研究方向为短包通信、物理层安全等。
郝万明（1988- ），男，河南安阳人，博士，郑州大学讲师，主要研究方向为毫米波、NOMA 无线通信、边缘缓存和无线携能通信等。
朱政宇（1988- ），男，河南周口人，博士，郑州大学讲师，主要研究方向为携能传输、大规模MIMO等。
基金资助:
国家自然科学基金资助项目(61801435);河南省科技攻关基金资助项目(202102210119);郑州市重大科技创新专项基金资助项目(2019CXZX0037)

Secure transmission for NOMA downlink based on short packet communication

Gangcan SUN¹^,²^,³, Shaoke ZHAO¹^,², Wanming HAO²^,³, Zhengyu ZHU²^,³

¹ Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450003, China
² Industrial Technology Research Institute, Zhengzhou University, Zhengzhou 450001, China
³ School of Information Engineering, Zhengzhou University, Zhengzhou 450001, China

Revised:2020-09-25 Online:2021-02-25 Published:2021-02-01
Supported by:
The National Natural Science Foundation of China(61801435);Science and Technology Project of Henan Province(202102210119);Major Science and Technology Innovation Project of Zhengzhou(2019CXZX0037)

摘要/Abstract

摘要：

面向物联网业务中的低时延需求，将短包通信（SPC）和非正交多址接入（NOMA）技术相结合，针对存在窃听者的情况研究多用户 NOMA 系统中的安全传输问题。以最大化弱用户的安全吞吐量为目标，考虑用户译码错误概率约束、总功率约束和功率分配约束，提出了一种低复杂度的功率分配方案实现系统安全传输。为解决复杂的目标函数和不可靠的串行干扰消除（SIC）技术带来的问题，首先证明约束条件在取得最优解时的紧约束性，在最大译码错误概率约束下，对功率约束进行转化和计算，得到强用户发射功率范围，推导出基站向强用户的发射功率搜索集；然后利用一维搜索算法对功率进行分配，实现弱用户吞吐量最大化。仿真结果证明，所提方案可有效提高系统中弱用户的安全吞吐量。

关键词: 短包通信, 非正交多址接入, 安全吞吐量, 功率分配

Abstract:

For the low-latency requirements of Internet of things (IoT) business, short packet communication (SPC) and non-orthogonal multiple access (NOMA) were combined to study the problem of secure transmission in the multi-user NOMA system with eavesdroppers.With the maximizing the secure throughput of weak uses as the objective, considering the user decoding error probability constraint, total power constraint and power allocation constraint, a low-complexity power allocation algorithm was proposed to realize secure transmission.In order to solve the problem caused by complex objective function formula and unreliable serial interference cancellation (SIC) technology, the proof that the compactness of the constraints was necessary to find the optimal solution.Under the constraint of maximum decoding error probability, the power constraint was transformed and calculated to obtain the strict limit of transmitting power for strong users, and the transmit power search set from base station to strong user was derived.Then, the one-dimensional search algorithm was used to allocate power resources to maximize the throughput of weak users.Simulation results prove that the proposed algorithm can effectively improve the security throughput of weak users in the system.

Key words: short packet communication, non-orthogonal multiple access, secure throughput, power allocation

中图分类号:

TN929

孙钢灿, 赵少柯, 郝万明, 朱政宇. 基于短包通信的NOMA下行链路安全传输[J]. 通信学报, 2021, 42(2): 168-176.

Gangcan SUN, Shaoke ZHAO, Wanming HAO, Zhengyu ZHU. Secure transmission for NOMA downlink based on short packet communication[J]. Journal on Communications, 2021, 42(2): 168-176.

图/表 6

图1

表1

仿真参数"

参数	数值
总传输包长N /symbol	100～200（图2），100（图3～图5）
传输比特数B/bit	200（图2、图4和图5），100～200 （图3）
用户噪声功率 $σ_{i}^{2}$ /dB	-5^[33]
窃听者噪声功率 $σ_{e}^{2}$ /dB	2^[33]
用户2信息保密约束δ	10^-2（图2～图5），10^-5（图5）
用户1最大译码错误概率ε₀	10^-5（图2～图5），10^-2（图5）
总功率P/dB	20（图2和图3），15～25 （图4），15～35（图5）
用户1信道增益h₁	0.6（图2～图4），0.8（图5）
用户2信道增益h₂	0.3
窃听者信道增益h_e	0.2（图2、图3和图5），0.1（图4）
OMA方案中用户2资源分配系数α	50%，60%

表1

图2

图3

图4

图5

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基于短包通信的NOMA下行链路安全传输

Secure transmission for NOMA downlink based on short packet communication

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