CD3S通信的软件无线电实现

针对混沌直接序列扩频(Chaotic Direct Sequence Spread Spectrum,CD3S)通信技术的实现问题,提出了一种CD3S通信的软件无线电实现方案,阐述了CD3S通信系统发收机的设计方法。发射机由软件实现信息码的混沌扩频,并通过硬件平台完成发射。接收机由硬件平台完成下变频与采样,然后通过软件实现定时同步、载波同步与信息解调。信息解调由多滤波器解调算法实现。在多滤波器解调算法中,由无损卡尔曼滤波(Unscented Kalman Filter,UKF)估计混沌码、卡尔曼滤波(Kalman Filter,KF)估计信道参数和最小均方误差(Minimum Mean Square Error,MMSE)滤波估计信息码这3个滤波器交替工作,通过联合估计实现信息码的解调。实验结果表明,该方案可以实现CD3S通信。

Software Radio Implementation of CD3S Communication

To implement the Chaotic Direct Sequence Spread Spectrum(CD3S)communication,a software radio implementation scheme for CD3S communication is proposed,and the design method of the transceiver is presented.The transmitter realizes the chaotic spread spectrum of the data symbol by software and completes the transmission through the hardware platform.The receiver completes the down-conversion and sampling through the hardware platform,and then realizes timing synchronization,carrier synchronization and data symbol demodulation by software.The data symbol demodulation is realized by the multi-filter demodulation algorithm.In the multi-filter demodulation algorithm,the unscented Kalman filter(UKF)estimates the chaotic code,the Kalman filter(KF)estimates the channel parameters and the minimum mean square error(MMSE)filter estimates the data symbol.The three filters work alternately and accomplish the demodulation by joint estimation.The experimental results demonstrate that the proposed scheme can achieve CD3S communication.