摘要由于无线通信的广播特性，信息在传输过程中容易被拦截和窃听，物理层的安全问题亟待解决。方向调制技术(Directional Modulation, DM)作为一种新兴的物理层传输技术，可以有效提升通信系统的安全性能。论文主要的研究工作如下：
（1）研究了方向调制系统的合成技术及主要的度量指标。DM属于发射端技术，允许期望方向上数字编码信息的安全传输，同时干扰所有其他方向上相同信号的星座模式，可以采用安全速率和误码率指标进行DM系统间的性能分析。仿真结果表明，与常规的波束成形阵列以及静态DM系统相比，动态DM系统通过非期望方向上增强的随机扰动机制，可以提供更为稳定的安全传输性能。
（2）为进一步提高多方向调制的合成性能，设计了基于最大化信泄噪比(Maximum signal-to-leakage-and-noise ratio, Max-SLNR)的方向调制合成方法。仿真结果表明：与常规的基于正交投影的DM方案相比，由于Max-SLNR方案综合考虑了接收机噪声的影响，在多用户场景，在期望用户方向能够提供更好的误码性能。77149
毕业论文关键词 方向调制 误码率 安全速率 多波束 大规模MIMO 信泄噪比
毕业设计说明书外文摘要
Title Research on Basic Principal and Synthesis technology of Directional Modulation
Abstract Due to the broadcasting nature of wireless communications, the information is accessible to the eavesdroppers during the transmissions, which needs to be highly addressed。 The directional modulation (DM) technology, as a promising physical layer security technology, can be effectively utilized to ensure the security performance。 The main contents are organized as follows:
(1) The synthesis procedures of DM systems and its evaluation metrics are investigated。 DM is a transmitter-side technology, which projects digitally encoded information signals onto desired directions and simultaneously distorts the constellation formats of the same signals in all other spatial directions。 The synthesis methods of the DM inter-systems are validated and discussed via the secrecy rate and bit error rate metrics。 The simulations show that the dynamic DM systems outperform the conventional beam-forming arrays and static types by exploiting the enhanced random interferences in undesired directions。
(2) In order to further improve the performance of directional modulation, the maximum signal-to-leakage-and-noise ratio (Max-SLNR) is proposed to implement DM。 It follows from our simulation results that the proposed Max-SLNR scheme can provide a better BER performance along the desired directions compared to the orthogonal projection method in multi-user scenario。
Keywords DM BER Multi-beam Security Rate Massive MIMO SLNR
目 次
1 绪论 3
1。1 物理层安全技术概述 3
1。3 论文结构 5
2 方向调制基本原理和度量指标 6
2。1 引言 6
2。2 方向调制的合成技术 6
2。3 方向调制系统的度量指标 15
2。4 本章小结 21
3 多波束方向调制接收机的合成 方向调制基本原理和合成技术研究:http://www.youerw.com/tongxin/lunwen_88632.html