多载波NOMA安全通信系统稳健性资源分配算法

doi:10.11959/j.issn.1000-436x.2022044

Abstract

Abstract:

To improve the spectrum efficiency and enhance the information security of wireless network, a sum secrecy rate maximization-based robust resource allocation algorithm was proposed for a downlink multicarrier NOMA security communication system.Firstly, the artificial noise (AN) precoding vector was designed to be orthogonal to the legitimate channel, so that the legitimate transmission would not be affected by the AN.Then, considering the constraints of rate requirement of each user and the maximum transmit power of base station, a joint AN precoding, downlink data precoding and subcarrier allocation optimization problem was formulated under eavesdropping channel uncertainties.To solve that non-convex problem, it was decomposed into two joint optimization subproblems: precoding optimization and subcarrier allocation.The former was solved based on S-procedure and block coordinate descent (BCD) algorithm, the latter was solved by dynamic matching theory.Simulation results demonstrate that the proposed algorithm has good robustness and can effectively improve the sum secrecy rate.

Key words: multicarrier, NOMA, physical layer security, artificial noise, precoding, subcarrier allocation

CLC Number:

TN92

Yu ZHANG, Xiongwen ZHAO, Xiaoqing WANG, Suiyan GENG, Peng QIN, Zhenyu ZHOU. Robust resource allocation algorithm for multicarrier NOMA security communication system[J]. Journal on Communications, 2022, 43(3): 42-52.

Figures/Tables 8

算法	复杂度
本文算法	$O {2 I^{2} N_{\max} (X^{4} M^{\frac{1}{2}} + Y^{4} N^{^{\frac{1}{2}}}) \log (\frac{1}{ε})}$
穷尽搜索算法	$O {\frac{(2 I)! I!}{2^{I}} N_{\max} (X^{4} M^{^{\frac{1}{2}}} + Y^{4} N^{^{\frac{1}{2}}}) \log (\frac{1}{ε})}$
文献[15]算法	$O {6 I^{2} {N^{'}}_{\max} {(7 + 6 M)}^{2} (16 + 4 M)}$

References 28

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参数	取值
子载波数	16
小区半径/m	500
系统带宽/MHz	5
噪声功率谱密度/(dBmxHz^-1)	-174
路径损失/km	128.1+37.6lgd
基站发射天线数	4
窃听天线数	{1, 2}
归一化信道估计误差	0.02
用户最小传输速率需求门限/(bitx(sxHz)^-1)	1
基站最大传输功率/dBm	30

Robust resource allocation algorithm for multicarrier NOMA security communication system

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