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Easy encoding and low bit-error-rate chaos communication system based on reverse-time chaotic oscillator

机译：基于逆时混沌振荡器的易于编码和低误码率的混沌通信系统

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摘要

A new chaos communication system based on reverse-time chaotic oscillator (RTCO) is proposed in this study. In the system, driven by bipolar sequence, RTCO can directly generate chaotic wave signals that can encode arbitrary binary information, which is much easier than that of the existing chaotic communication scheme in that needs the initial condition estimation. Then the analytical expression of matched filter for the basis function of RTCO is derived. The proposed matched filter is capable of decreasing the effect of noise in the channel. Next, the binary information can be obtained by detecting the summation of multi-sampling during the symbol period through a setting threshold over additive white Gaussian noise (AWGN) channel, which further decreases the influence of noise in decoding procedure. In addition, the binary information can also be obtained over the Rayleigh channel, and its bit error rate (BER) expression is derived. Finally, the feasibility and the validity of the proposed system are given with numerical simulations. It is shown that in the proposed communication system, the encoded chaotic signal is generated with a much simpler method. Furthermore, the BER is lower than that in over AWGN channel, and the performance of the proposed system over Rayleigh channel is better than that of differential-chaos-shift-keying.
机译：提出了一种基于逆时混沌振荡器（RTCO）的新型混沌通信系统。在该系统中，由双极性序列驱动，RTCO可以直接生成可以编码任意二进制信息的混沌信号，这比现有的混沌通信方案要简单得多，因为它需要初始条件估计。然后推导了针对RTCO基函数的匹配滤波器的解析表达式。所提出的匹配滤波器能够减少信道中的噪声影响。接下来，通过在加性白高斯噪声（AWGN）信道上通过设置阈值检测符号周期内的多次采样的总和，可以获得二进制信息，这进一步减小了噪声在解码过程中的影响。另外，还可以通过瑞利信道获得二进制信息，并导出其误码率（BER）表达式。最后，通过数值模拟给出了所提系统的可行性和有效性。结果表明，在所提出的通信系统中，编码的混沌信号是用一种非常简单的方法生成的。此外，BER低于AWGN信道上的BER，所提出的系统在Rayleigh信道上的性能优于差分混沌移位键控。

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