WFRFT认知通信系统控制参数联合优化方法研究  

Research on Joint Optimization Method of Control Parameters in WFRFT Cognitive Communication System

作　　者：杜欣军 刘鹏飞[1] DU Xinjun;LIU Pengfei(The 32nd Research Institute of China Electronics Technology Group Corporation,Shanghai 201808,China)

机构地区：[1]中国电子科技集团公司第三十二研究所,上海201808

出　　处：《计算机工程》2021年第12期177-184,共8页Computer Engineering

基　　金：国家部委基金。

摘　　要：针对WFRFT系统难以适应复杂电磁环境及最优控制参数难以选取的问题,提出一种新型WFRFT认知通信系统构建方法。在传统WFRFT通信系统的基础上引入信号认知模块,完成电磁信号的采集及电磁环境中目标信号调制特征的识别。根据WFRFT信号调制特征裂变的特性,分析控制参数间的耦合作用机理,并设定优化控制参数的目标。将目标信号调制特征参数引入到WFRFT控制参数优化模型中,提出基于目标特征的WFRFT认知通信系统控制参数联合优化方法,并通过粒子群算法的迭代计算,选取最优控制参数集,针对最优参数的WFRFT认知通信系统,分别仿真计算高斯、莱斯、瑞利等典型信道条件下的误码率性能。实验结果表明,该方法可伪装信号调制特征,能有效提高通信信号的安全性,且在典型信道条件下的误码率性能较好,具有较好的抗干扰能力。To deal with the selection of the optimal control parameters in Weighted Fractional Fourier Transform(WFRFT),this paper constructs a novel WFRFT cognitive communication system.On the basis of the traditional WFRFT communication system,a signal recognition module is introduced to realize the recognition of the modulation characteristics of target signals in the electromagnetic environment.At the same time,according to the fission characteristics of the modulation characteristics of WFRFT signals,the coupling mechanism between the control parameters is deeply analyzed,and the goal of control parameter optimization is set.On this basis,the parameters of target signal modulation characteristics are introduced into the optimization model for WFRFT control parameters,so as to form a joint optimization method of control parameters in a WFRFT cognitive communication system based on target characteristics.In addition,the optimal control parameter set is selected through the iterative calculation of the particle swarm algorithm.For the WFRFT cognitive communication system with optimal parameters,the Bit Error Ratio(BER)performance under typical channel conditions such as Gaussian,Rice and Rayleigh are simulated.The experimental results show that the proposed method can realize the camouflage of signal modulation characteristics,and effectively improve the security of communication signals.At the same time,the WFRFT system displays good anti-interference ability,and provides excellent BER performance under typical channel conditions,so it can effectively meet the requirements of engineering applications.

关 键 词：变换域通信 加权分数阶傅里叶变换 认知通信 粒子群算法 安全通信 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]