基于Zadoff-Chu序列的单载波抗截获波形设计

Single-carrier anti-interception waveform design based on Zadoff-Chu sequence

单载波系统中,采用相同的UW字进行捕获、多普勒估计和信道估计。目前采用相同的UW字容易被非合作方进行盲参数估计和捕获,危及信号的安全性和私密性。为了防止电子对抗中的窃听攻击,保护信号的安全性和私密性,设计针对单载波系统的抗截获波形。首先进行UW字的选择,选择符合进行捕获、多普勒估计和信道估计的UW字。设计新的帧格式,使其具有抗截获能力并保持SC-FDE原有的良好性能。将传统的同步头去掉,采用PMF-FFT方法进行捕获和多普勒估计,采用SC-FDE方法进行信道估计。对该帧格式的波形进行多普勒估计性能、误码率和循环特性抑制的仿真测试。仿真结果表明,在误码率影响极小的情况下、不增加复杂度的前提下,实现了单载波循环自相关的峰均比性能提高了91.72%,提高了波形的抗截获性能。

In a single carrier system,the same UW(unique word)is used for acquisition,Doppler estimation and channel estimation.At present,using the same UW can easily be blind parameter estimation.The signal can easily be captured by non-cooperative parties,which endangers the security and privacy of the signal.In order to prevent eavesdropping attacks in electronic countermeasures and protect the security and privacy of signals,an anti-interception waveform is designed for single-carrier systems.Firstly,select UW words,and select UW that meet the requirements for acquisition,Doppler estimation,and channel estimation.Design a new frame format to have anti-interception performance and maintain the original good performance of SC-FDE.The traditional synchronization sequence is removed,PMF-FFT method is used for acquisition and Doppler estimation,and SC-FDE method is used for channel estimation.The simulation test of Doppler estimation performance,bit error rate and cycle characteristic suppression are performed on the waveform of this frame format.The simulation results show that the peak-to-average ratio performance of the cyclic autocorrelation is increased by 91.72%under the condition of minimal impact of the bit error rate and without increasing the complexity,and the anti-interception performance of the waveform is improved.