The Design Of The Power Line Modem Based On The Spread Spectrum Technique

The Power Line Communication (PLC) is a kind of rising communication mode differing from traditional communication such as telecommunication ,telephone, radio communication, etc. There are many technical difficulties in the communication via the PLC such as nonstandard network, more nodes, more insulation and random disturbance, etc.As far as the communication concerned, the power grid is an indefinite, abnormal, nonstandard network whose characteristic is a topology characteristic, and it becomes a challenge task in the communication field.The article adopts the prevalent technique of DSSS to tackle the disturbance problem in the PLC. We design the peripheral circuit based on the modem chip SC1128 newly developed by ZYLH company in Beijing which suits for Chinese power grids, thereby we devise a PLC system and combine with the Error— Correcting Codes(ECC) in the software design of the MSPF149 MCU to further promote the reliability of the communication.The system we designed adopts RS232 standard and can be debugged and configured easily, so it has high popularizing values.