双频载波通信电路的研制

为了在信道特性十分恶劣的低压电力线上实现可靠通信，本采用双路扩频技术通过快速CPU用软件进行数字信号处理来实现调制解调。载波耦合和功率放大电路采用光电耦合式HCPL-800J型电力线通信信号接入集成电路，使该载波通信系统兼有宽带扩频通信方式抗通信频带内干扰能力强和窄带通信方式克服信道衰减、抗通信频带外干扰能力强的特点，而且集成度高，调试方便。

The development of the communication circuit with double-frequency carrier

In order to made realiable communication in low voltage power line for its scurviness of channel characteristic, the communication circuit in our paper adopts the technology of double-frquency spread spectrum based on DSP emused fast CPU. The power and carrier coupling circuit adopt HCPL-800J based on photoelectircity coupling. This system both have the advantage of the narrowband communication and broadband communication, moreover the intergration of the system is high,and debug is very convenience.