面向低压电力线扩频通信，基于Tent混沌序列提出了一种全新的混沌扩频序列复合构建方法。该方法通过对两组独立混沌序列乘积实值序列进行量化，快速构建扩频序列；研究了电力线通信的信道频率响应和噪声特征，并建立了基于该信道特性的电力线扩频通信系统模型。通过将复合混沌扩频序列应用于所建立的电力线扩频通信系统模型，对其性能进行了仿真验证。仿真结果表明：采用复合混沌扩频序列的电力线扩频通信系统在信噪比低于传统扩频序列3 dB的情况下仍能保证相同误码率。%Facing to low-voltage power line spread spectrum communication, a novel method of creating composite chaotic spread spectrum sequence based on Tent chaos sequence is proposed. The presented algorithm generates the spread spectrum sequence by quantifying the multiplication result of two independent chaos sequences, such as the Tent chaos sequence. The frequency response and noise characteristics of power line communication (PLC) channel are researched, and the typical channel model of PLC is built as well. The performance of the proposed composite chaotic spread spectrum sequence is verified by applying it to the spread spectrum PLC system model. Experimental result shows that compared with the traditional chaotic sequence, the direct sequence spread spectrum (DSSS) PLC system using the composite chaotic sequence generated by the proposed algorithm can guarantee the same BER on the condition that its SNR is 3 dB lower than the DSSS system using traditional single sequence.
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