基于短包通信的NOMA下行链路安全传输

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

Abstract

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

CLC Number:

TN929

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.

Figures/Tables 6

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%

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