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基于正交频分复用(OFDM)的概念,给出了在宽带电力线通信(PLC)中应用OFDM编码方法及其实现模型,并分析了常用编码OFDM技术应用于宽带电力线通信中存在的优点及不足。针对无效频谱现象,提出使用前置编码OFDM来改进常用编码OFDM技术的方案,并在模拟的低压电力载波通道模型上对这两种技术进行了宽带PLC模拟仿真,结果表明应用前置编码OFDM技术可以大幅度减小传输信号误码率,并且简化了常用编码OFDM通信系统实现的复杂性。
Based on the concept of Orthogonal Frequency Division Multiplexing (OFDM), this paper presents an OFDM encoding method and its implementation in broadband PLC, and analyzes the advantages of common encoding OFDM technology in broadband power line communication. insufficient. Aiming at the inefficient spectrum phenomenon, this paper proposes a scheme of using pre-coded OFDM to improve the commonly used OFDM technology. The simulation results show that the application of pre-coded OFDM Can greatly reduce the transmission signal error rate, and simplifies the commonly used coding OFDM communication system to achieve the complexity.