摘要
为了加强无线通信物理层的传输安全,提出了一种基于天线虚拟运动的跳空扩频调制信号,采用天线的切换发射仿真天线运动,并且天线的切换方式由扩频码控制。利用天线开关函数产生的谐波分量构成一个空间扩频信号,这样发射的扩频信号不仅与发射信号使用的扩频码有关,而且与接收机相对于发射机的空间方位信息有关,是一种多天线跳空方式产生的扩频信号。最后给出了跳空扩频信号的频谱扩展性能、自相关性能、互相关性能、安全性能和多用户的通信性能,仿真结果表明跳空扩频信号为信息提供了一种更加安全的无线传输方法。
A space hopping spread-spectrum modulation signal transmitted by a virtual motion antenna is proposed to guarantee the information security at the physical layer.A switched antenna array is employed to simulate antenna motion,and the switching mode is controlled by a spread-spectrum sequence.In this way,a spread-spectrum modulation signal is formed by the fundamental components and the harmonic components which are generated by the switching function of the antenna array.Therefore the transmit signal is associated with not only the spread-spectrum sequence but also the azimuth angle information of the receiver.Finally,the performances of spectrum spread,autocorrelation,cross-correlation,security and multi-user communication are investigated.Simulation results show that the proposed signal offers a security transmission method for wireless communication.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2011年第4期481-485,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
江苏省自然科学基金(BK2009367)资助项目
航空科学基金(20095152026)资助项目
关键词
扩频调制
安全通信
虚拟运动
跳空
spread spectrum modulation
secure communication
virtual motion
space hopping
