| 摘要: |
| 针对差分混沌-相关延时移位键控（DC-CDSK）存在的码间干扰而造成的比特误码率较高问题，提出了一种无码间干扰DC-CDSK混沌通信方案。通过改变混沌信号发生器的结构，确保发送的两路混沌信号严格正交，彻底解决了判决变量中码间干扰问题。推导了在高斯白噪声信道中的比特误码率公式并完成仿真，结果表明，在一定信噪比和扩频因子条件下无码间干扰DC-CDSK比特误码率比原系统提高了2~3 dB。 |
| 关键词: 混沌通信 DC-CDSK 判决变量 码间干扰 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（61371164）；重庆市教育委员会科研项目（KJ1600429） |
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| A DC-CDSK chaotic communication system without inter-symbol interference |
| ZHANG Gang,XU Jiaping,ZHANG Tianqi |
| (Chongqing Key Laboratory of Signal and Information Processing,Chongqing niversity of Posts
and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| For existing defects of high bit error rate（BER） caused by inter-symbol interference(ICI) in the Differential Chaos-Correlation Delay Shift Keying（DC-CDSK）,a novel DC-CDSK chaotic communication system without inter-symbol interference is proposed.By changing the structure of chaotic signal generator,the modulated chaotic signals transmitted in two channels become strictly orthogonal,which thoroughly eliminates all possible inter-symbol interference component in all decision variables.The BER formula in Gaussian channel is derived and numerous simulations are completed.The simulation results show that the BER performance in proposed DC-CDSK without inter-symbol interference increases by 2~3 dB compared with that of the conventional DC-CDSK under certain signal-to-noise ratio(SNR) and spreading factor. |
| Key words: chaotic communication DC-CDSK decision variables inter-symbol interference |
