摘要： 将调制方式作为跳变优化对象是一种新型抗截获通信技术，可减小对抗方的调制识别概率，提高通信的安全性。为增强跳变图案的复杂性，降低其破译风险，提出一种新的调制跳变图案设计方法。在三维混沌系统中引入加权反馈机制，采用粒子群优化算法对加权因子进行优化，产生复杂度更高的混沌实值序列，并利用余弦映射法生成最终的调制跳变图案。在此基础上，通过FPGA动态可重构技术，在软件无线电平台上以较小的资源消耗实现复杂的调制跳变功能。测试结果表明，相比传统的m序列和低维混沌序列方法，该方法生成的跳变图案近似熵最大且复杂度最高，能够满足资源受限场景下调制跳变通信系统的应用需求。

关键词: 调制跳变, 加权反馈, 混沌系统, FPGA动态可重构技术, 软件无线电, 抗截获通信

Abstract: It is a new anti-interception communication technology to take the modulation method as the hopping optimization object,which can reduce the probability of modulation identification of the opposing party and improve the communication security.In order to increase the complexity of the hopping pattern and reduce its risk of being decrypted,this paper proposes a new design method of modulation hopping pattern.The weighted feedback mechanism is introduced into the three-dimensional chaotic system,and the Particle Swarm Optimization(PSO) algorithm is used to optimize the weighting factors to generate chaotic real-value sequences with higher complexity.The cosine mapping method is used to generate the final modulation hopping pattern.On this basis,the dynamically reconfigurable FPGA technology is used to realize the complex modulation hopping function on the software radio platform with less resource consumption.The test results show that,compared with the hopping patterns generated by the traditional m-sequence and low-dimensional chaotic sequence methods,the hopping patterns generated by the proposed method have the largest approximate entropy and the highest complexity,which can effectively meet the application requirements of modulation hopping communication system in resource-constrained scenarios.

Key words: modulation hopping, weighted feedback, chaotic system, dynamically reconfigurable FPGA technology, software radio, anti-interception communication

中图分类号: 

• TP391