Research And Design On Anti-interference Of Power Line Carrier Communication Based On PL3200Chip

As a kind of communication medium for data transmission, power line has abroad space for development and a application prospects, incalculable economic value.Power line carrier as one way of data transmission has been a very good application inthe power system dispatching communication, remote control, protections, and kindsof information transmission have been a very good application. Power line carriercommunications use the strong resource, low line attenuation, high mechanicalstrength, reliable transmission and other advantages of power lines, can eliminate theneed for communication line construction of infrastructure investment and day-to-daymaintenance costs, therefore, there will be a higher level of application anddevelopment in power line carrier communications research field. Power line carriersystems showed a series of factors which is not conducive to safety and reliability ofdata transmission, such as, strong noise in the transmission channel, signal attenuationand so on. The design concept of this project is to improve the quality of datatransmission line, To solve this question, the subject proposed the introduction ofdirect-sequence spread-spectrum technology in the power line carrier system, n orderto ensure reliable data transmission, the introduction of direct-sequence spectrumtechnology which has strong anti-interference can be a good use to solve this problem.Based on the design concept of the subject, this article discusses from thefollowing content:(1) Introduced the anti-interference principle of spread spectrum technology, thekey technology in the spread spectrum systems and the application of spread spectrumtechnology in modern communication;(2) Through the study of the status quo of today Power Line CommunicationDevelopment and engineering applications, introduce the interference phenomena ofthe data transmission in the channel, and establish the ideal channel model of low-voltage power lines on the basis of the analysis;(3) Through the study and compare with the current anti-jamming, choose thedirect sequence spread spectrum code with anti-jamming and secrecy features as thetechniques to improve the transmission quality of the channel in power linecommunication;According to the basic theory and key technology of spread spectrum, completethe design about the power line carrier communication system with anti-interferenceability by PL3200. The section of system software, the main program flowchart, andmain subroutine flowcharts are also presented on the base of hardware circuit.The design transform the existing power line carrier communication system withthe fine features of spread spectrum technology, such as strong anti-jamming, privacyand so on, the design inherited the fine feature of power line system, at the same time,it has the function of anti-interference for the purpose of improving communicationquality. The theoretical analysis and experimental results show that: the power linespread spectrum communication can effectively circumvent the time-varyingattenuation of the channel noise and signal which has a strong practical value. Thelow-voltage power line transmission and high-speed power line is in full swing, thetopic provides the basis for the further research and development of power linecommunications application.The arrangement of the chapters of this topic is given based on theanti-interference of spread spectrum technology, achieve the block diagram of powerline carrier communication system and the specific hardware implementation andsoftware implementation, adopt a progressive manner so that we can have the systemquickly and accurately grasp the basis of the establishment of a critical theory.