【摘要】 中压电力线信道可以用于高速数据传输业务。文章结合实测数据,分析了中压电力线信道复杂的噪声环境和多径衰落特性。为了提高这种特殊信道条件下的传输效果,选择了编码正交频分多路复用技术(COFDM)作为调制方案。分析了编码方案和交织深度的选取对系统抗突发噪声性能的影响;提出利用子载波位置调整法和子载波功率调整法,以削弱窄带噪声对系统的干扰;通过仿真证明了此系统方案能显著降低中压电力线在传输过程中的误码率。更多还原

【Abstract】 The medium voltage power line network can be used for high-speed data transmission services.Based on real measurement results,this paper analyzes the noise characteristics and multi-path transmission attenuation of the power line transmission channel.In order to tackle the BER degradation caused by the PLC channel characteristics,COFDM technique is chosen as the modulation method.This paper also analyzes the effect of interleaving depth and coding scheme on suppressing impulse noise,and two novel schemes-sub-carrier selection and sub-carrier power adjustment are proposed.The performance is studied by simulation,with conclusion that the proposed schemes improve the BER performance of the system greatly.更多还原