【摘要】 为解决传统差分混沌移位键控(differential chaotic shift keying, DCSK)系统安全性较差及误码性能受限的问题，提出一种结合脉冲位置调制与动态帧变换技术的DCSK(frame-transform DCSK system based on pulse position modulation, FT-PPM-DCSK)系统，实现安全性与误码性能的协同优化。通过推导系统在加性高斯白噪声(additive white Gaussian noise, AWGN)信道下的误比特率(BER)表达式，基于蒙特卡洛仿真验证其性能。实验结果表明，与基准DCSK系统相比，FT-PPM-DCSK系统提高了误码性能且具有更高的安全性。更多还原

【Abstract】 To solve the problems of poor security and limited bit error performance of traditional differential chaotic shift keying system(DCSK),a differential chaotic shift keying system combining pulse position modulation and dynamic frame transform technology(FT-PPM-DCSK)is proposed.Based on the hybrid modulation strategy of frame transformation, the system uses pulse position modulation(PPM)to modulate part of the information bits to achieve the collaborative optimization of security and bit error performance.The bit error rate(BER)expression of the system in additive white Gaussian noise(AWGN)channel is derived, and its performance is verified by Monte Carlo simulation.The experimental results show that, compared with the benchmark DCSK system, the FT-PPM-DCSK system improves the BER performance and has higher security.更多还原