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为克服在光纤同轴电缆混合(HFC)网络进行双向改造时会遇到的汇集噪声问题,引入混沌机制,将有用信号调制到参数空间中去,利用混沌的分叉特性和参数敏感性处理回传噪声问题。通过对Duffing方程的分析给出了这种方法的理论推导,并且给出了具体实践中的模型,同时分析了实际运用中可能出现的阵发混沌现象以及仿真结果。混沌振子首次被引入数字系统中,并实现了对四相频移随控(QP-SK)信号的解调。此方法使得在信噪比很低的情况下仍旧能够检测出回传信号,使原有网络得到充分利用,双向改造更加简便易行。
In order to overcome the problem of pooled noise encountered in the fiber coaxial cable hybrid (HFC) network, a chaos mechanism is introduced to modulate the useful signal into the parameter space. The chaotic bifurcation and parameter sensitivity Noise problem. The theoretical derivation of this method is given through the analysis of the Duffing equation, and the model in practical practice is given. At the same time, the possible chaotic phenomena and the simulation results are also analyzed. Chaos oscillator is introduced into digital system for the first time and demodulation of QP-SK signal is realized. This method makes it possible to detect the backhaul signal under the condition of very low signal-to-noise ratio, make full use of the original network and make bidirectional transformation more simple and easy.