JZUS - Journal of Zhejiang University SCIENCE

Frontiers of Information Technology & Electronic Engineering 2018 Vol.19 No.3 P.398-408

Resource allocation for physical-layer security in OFDMA downlink with imperfect CSI

Author(s): Wei Yang, Jing Mao, Chen Chen, Xiang Cheng, Liu-qing Yang, Hai-ge Xiang
Affiliation(s): State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University, Beijing 100871, China; more
Corresponding email(s): youngwei@pku.edu.cn, maojing@pku.edu.cn, c.chen@pku.edu.cn, lqyang@engr.colostate.edu
Key Words: Resource allocation, Orthogonal frequency-division multiple access (OFDMA), Imperfect channel state information (CSI), Physical layer security

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Abstract: We investigate the problem of resource allocation in a downlink orthogonal frequency-division multiple access (OFDMA) broadband network with an eavesdropper under the condition that both legitimate users and the eavesdropper are with imperfect channel state information (CSI). We consider three kinds of imperfect CSI:(1) noise and channel estimation errors, (2) feedback delay and channel prediction, and (3) limited feedback channel capacity, where quantized CSI is studied using rate-distortion theory because it can be used to establish an information-theoretic lower bound on the capacity of the feedback channel. The problem is formulated as joint power and subcarrier allocation to optimize the maximum-minimum (max-min) fairness criterion over the users' secrecy rate. The problem considered is a mixed integer nonlinear programming problem. To reduce the complexity, we propose a two-step suboptimal algorithm that separately performs power and subcarrier allocation. For a given subcarrier assignment, optimal power allocation is achieved by developing an algorithm of polynomial computational complexity. Numerical results show that our proposed algorithm can approximate the optimal solution.

基于非完美信道状态的下行OFDMA系统中优化物理层安全问题的资源分配算法研究

概要：介绍了一种基于正交频分多址（OFDMA）技术的下行通信系统中优化物理层安全问题的资源分配方案。假设系统中存在多名合法用户和一名采取"被动窃听"方式的非法入侵者，同时考虑基站端收到合法用户和窃听者的信道状态信息均含有误差。讨论了3种非完美信道状态信息情况，分别是：（1）信道信息存在估计误差；（2）信道信息反馈存在时延，需要通过预测估计当前信道状态；（3）反馈信道容量受限，导致量化误差，运用率失真理论可以推导出反馈信道容量的下界。我们把优化问题建模成一个功率和子载波的联合分配问题，优化目标为最大化用户最小的遍历安全容量。该优化问题是一个混合整数非线性规划问题，最优解计算复杂度较高。为降低求解复杂度，提出一种两步次优算法，分别进行子载波分配和功率分配。在给定某种子载波分配方案时，可以通过一种多项式复杂度算法，得出最优功率分配方案。仿真结果证明我们提出的算法在性能上可以逼近最优解。

关键词：资源分配；正交频分多址（OFDMA）；非完美信道状态信息；物理层安全

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