A Security Method of Physical Layer Transmission Using Random Antenna Arrays in Wireless Communication

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A Security Method of Physical Layer Transmission Using Random Antenna Arrays in Wireless Communication

更新时间：2025-07-09

- A Security Method of Physical Layer Transmission Using Random Antenna Arrays in Wireless Communication
- Vol. 44, Issue 6, Pages: 62-66(2010)
- 作者机构：
  
  1. 西安交通大学智能网络与网络安全教育部重点实验室,西安,710049
  2. 西安交通大学电子与信息工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN929.5
- Online First：10 June 2010，
  
  Published：2010
- 稿件说明：
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A Security Method of Physical Layer Transmission Using Random Antenna Arrays in Wireless Communication[J]. 2010, 44(6): 62-66.
DOI：

A Security Method of Physical Layer Transmission Using Random Antenna Arrays in Wireless Communication[J]. 2010, 44(6): 62-66. DOI：

摘要

为了在无线通信过程中保证信息安全

提出了一种使用随机天线阵列的物理层安全传输方法(RAA方法).该方法在基站端使用多天线而在移动用户端使用单天线

期望移动用户首先发送同步训练符号

基站根据接收到的训练符号估计信道

然后基站随机选取若干天线并根据估计到的信道使用分布式波束形成的方法进行加权发射

各天线发射信号最后在期望用户接收点同相叠加

期望用户可以直接进行最大似然解调.由于基站在发射每个符号时都随机变换天线

将会导致窃听者的信道随机快速变化

因此窃听者无法通过盲均衡算法解调

从而保证了信息的低截获概率.与经典的使用随机加权系数的方法相比

RAA方法具有功率利用率更高的特点.仿真结果表明

在总功率一定的情况下

RAA方法可以在期望用户处获得比已有方法低一个数量级的误码率

而窃听者始终无法正确解调.

Abstract

A method of using random antenna arrays(RAA)is proposed to guarantee the information security during the physical layer transmission. The method uses multiple antennas at the base station and a single antenna at each mobile terminal. When expected mobile terminals(target users)transmit training symbols. the base station estimates the channel from the symbols. Then the base station randomly selects several antennas for weighted transmission

and the weighting coefficients are obtained by using the method of distributed beamforming according to the estimated channel. Signals from all the selected antennas are finally superimposed at the target user so that the maximum likelihood demodulation can be directly employed. The base station randomly changes antennas to transmit each symbol

which makes the channel of any eavesdropper change fast. Hence the eavesdropper can not demodulate his received signals by blind equalization

and the low probability of interception is achieved. A comparison with the traditional method of using random weighting coefficients shows that the RAA method improves the utilization of power. Simulation results show that the bit error rate of the RAA method is reduced by one order of magnitude at the target user

while the eavesdropper can not demodulate correctly.

关键词

Keywords

references

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PATHAN A S K, LEE H W, HONG C S. Security in wireless sensor networks: issues and challenges [C]∥Proceedings of the 8th International Conference on Advanced Communication Technology. Piscataway, NJ, USA: IEEE, 2006: 1043-1048.

AONO K, HIGUCHI T, OHIRA B, et al. Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels [J]. IEEE Transactions on Antennas and Propagation, 2005, 53(11): 3776-3784.

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