载波抄表系统的通信特性及全数字解决方案

Obstruction of the Communication for Carrier Wave Metering System and the Design of Digital Means

分析了我国低压电力线载波信道特征和传统载波通信电路的机理 ,指出传统载波通信芯片的抗干扰和抗衰减性能不足以克服低压电力线路的障碍。设计出一种符合我国低压电力线载波信道传输特性的数字载波抄表系统 ,通信电路放弃使用传统的载波芯片 ,以MCU或DSP为硬件平台用软件进行调制解调来嵌入通信功能 ,其模式采用载波频率可自适应跳变的窄带扩频方式 ,各项参数能够自适应调整以适应时变性大的电力信道 ,该系统的抗衰减和干扰的性能具备极大的优势 。

The paper analyses the reason that the anti\|jamming and the anti\|attenuation's abilities of traditional low voltage power line communication chips are not enough for overcoming the obstruction of the voltage power line communication environment, and designs a kind of digital power line communication metering system, which accords with the character of the low voltage power line transmission in our country The system gives up traditional carrier wave chips, combining with the superiority of narrow\|band frequency modulation communication and broad\| band spread\|spectrum communication, and uses the software to modulate and demodulate carrier wave signals based on the hardware of MCU or on the DSP, which realizes the carrier wave communication function. The communication model applies the narrow\|band expanded spectrum which can automatically adjust the carrier wave frequency Every parameter can be automatically adjusted to meet power channel with big time\|varying property. The system is of great superior abilities of anti\|jamming and the anti\|attenuation, and can carry out power line carrier wave metering reliably with low cost