全双工中继网络中的安全资源分配方法研究

发布时间：2018-05-27 22:03

本文选题：中继系统 + 全双工　；参考：《浙江大学》2017年硕士论文

【摘要】：在无线通信领域,通信能力和通信安全是两个最值得关注的方面。在通信能力方面,中继技术作为一种提升系统吞吐量和扩大系统覆盖范围的技术,正受到越来越多的关注。在通信安全方面,物理层安全技术,由于其安全性在数学上可以得到确切地证明,被认为是一种极具潜力的安全方案。因而,中继安全系统是一个有意思的研究方向。考虑到带内全双工技术可以为中继安全系统带来信息吞吐量和安全性能两方面的提升,于是,本论文围绕全双工中继安全系统,对其安全传输机制和资源分配问题进行研究,主要内容如下:首先,我们考虑单天线情况下,多个数据源-目的节点对和多个全双工中继子节点的安全中继网络,研究如何通过安全资源分配来实现系统的可实现安全速率的最大化。对于该问题,我们先针对单一全双工中继安全链路提出了基于人工噪声的安全传输策略,并推导了其可实现安全速率。在此基础上,网络安全速率最大化问题建模为一个混合整数非线性规划(Mixed-Integer Nonlinear Progranmming,MINLP)问题,并进一步分解为能量因子分配和中继子节点选择两个子问题。针对这两个问题,我们分别提出了基于粒子群(Particle Swarm Optimization,PSO)算法的最优能量分配方案和基于最大二部图权重匹配(Maximal Bipartite Weighted Matching,MBWM)算法的最佳中继节点选择方案。仿真结果表明,AN技术与全双工技术配合,可以在自干扰信号得到有效的抑制时,显著提高系统安全性能。同时,本文提出的安全资源分配方案相比其他几种方案,具有明显的性能优势。其次,我们研究了多天线情况下,MIMOME(Multiple Input Multiple Output Multi-antenna Eavesdropper)全双工中继安全系统下的安全资源分配问题,着重考虑了窃听链路只有统计CSI反馈情况下的系统安全性能。对于该问题,我们先给出了基于多天线AN技术的安全通信机制,并推导了系统可实现安全速率的闭式表达式。为了最大化系统可实现安全速率,我们接着提出了基于粒子群-差分进化(PSO-Differential Evolution,PSO-DE)算法的任意能量分配方案。考虑到该方案的复杂度,我们进而提出两种简化方案。仿真结果表明,简化算法与基于PSO-DE的任意能量分配方案可以实现一致的安全速率,本文中提出的基于AN的全双工安全通信策略和对应的安全资源分配方案可以实现不错的干扰抑制性能。
[Abstract]:In the field of wireless communication, communication capability and communication security are the two most worthy of attention. In terms of communication capacity, relay technology, as a technology to improve system throughput and expand system coverage, is receiving more and more attention. In the aspect of communication security, physical layer security technology is considered to be a potential security scheme because its security can be proved mathematically. Therefore, relay security system is an interesting research direction. Considering that the in-band full-duplex technology can improve the information throughput and security performance of the relay security system, this paper focuses on the security transmission mechanism and resource allocation of the full-duplex relay security system. The main contents are as follows: firstly, we consider the secure relay network with multiple data source-destination node pairs and multiple full duplex relay sub-nodes under the condition of single antenna. This paper studies how to maximize the security rate of the system through the allocation of security resources. To solve this problem, we first propose a secure transmission strategy based on artificial noise for a single full-duplex relay secure link, and derive its realizable security rate. On this basis, the network security rate maximization problem is modeled as a mixed integer nonlinear programming problem called Mixed-Integer Nonlinear granmming MINLPproblem, which is further decomposed into two sub-problems: energy factor allocation and relay sub-node selection. To solve these two problems, we propose an optimal energy allocation scheme based on particle swarm optimization Swarm optimization (PSO) algorithm and an optimal relay node selection scheme based on the maximal bipartite graph weight matching algorithm (Maximal Bipartite Weighted matching). The simulation results show that the combination of an technique and full-duplex technology can significantly improve the security performance of the system when the self-interference signal is effectively suppressed. At the same time, the security resource allocation scheme proposed in this paper has obvious performance advantages compared with other schemes. Secondly, we study the security resource allocation problem in the full duplex relay security system with multiple Input Multiple Output Multi-antenna dropper in the case of multiple antennas, and focus on the security performance of the eavesdropping link under the condition of statistical CSI feedback. For this problem, we first give a secure communication mechanism based on multi-antenna an technology, and derive the closed-form expression of the system security rate. In order to maximize the security rate of the system, we propose an arbitrary energy allocation scheme based on PSO-differential evolution PSO-DEE algorithm. Considering the complexity of the scheme, we propose two simplified schemes. The simulation results show that the simplified algorithm can achieve the same security rate as the arbitrary energy allocation scheme based on PSO-DE. The full duplex security communication strategy and the corresponding security resource allocation scheme proposed in this paper can achieve good interference suppression performance.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92;TN918

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